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Özkan CH, Atakay M, Salih B, Ertaş G. In vitro study on the competitive reactions between arsenite and selenite with glutathione. J Mass Spectrom 2024; 59:e5020. [PMID: 38659191 DOI: 10.1002/jms.5020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 02/12/2024] [Accepted: 03/05/2024] [Indexed: 04/26/2024]
Abstract
Exposure to arsenic can cause various biological effects by increasing the production of reactive oxygen species (ROS). Selenium acts as a beneficial element by regulating ROS and limiting heavy metal uptake and translocation. There are studies on the interactive effects of As and Se in plants, but the antagonistic and synergistic effects of these elements based on their binding to glutathione (GSH) molecules have not been studied yet. In this study, we aimed to investigate the antagonistic or synergistic effects of As and Se on the binding mechanism of Se and As with GSH at pH 3.0, 5.0, or 6.5. The interaction of As and Se in Se(SG)2 + As(III) or As(SG)3 + Se(IV) binary systems and As(III) + Se(IV) + GSH ternary system were examined depending on their ratios via liquid chromatography diode array detector/electrospray mass spectrometry (LC-DAD/MS) and liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS). The results showed that the formation of As(GS)3 was not detected in the As(III) + Se(SG)2 binary system, indicating that As(III) did not affect the stability of Se(SG)2 complex antagonistically. However, in the Se(IV) + As(SG)3 binary system, the addition of Se(IV) to As(SG)3 affected the stability of As(SG)3 antagonistically. Se(IV) reacted with GSH, disrupting the As(SG)3 complex, and consequently, Se(SG)2 formation was measured using LC-MS/DAD. In the Se(IV) + GSH + As(III) ternary system, Se(SG)2 formation was detected upon mixing As(III), Se(IV), and GSH. The increase in the concentration of As(III) did not influence the stability of the Se(SG)2 complex. Additionally, Se(IV) has a higher affinity than As(III) to the GSH, regardless of the pH of the solution. In both binary and ternary systems, the formation of the by-product glutathione trisulfide (GSSSG) was detected using LC-ESI-MS/MS.
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Affiliation(s)
- Canan Höçük Özkan
- Department of Chemistry, Faculty of Arts and Science, Middle East Technical University, Ankara, Turkey
| | - Mehmet Atakay
- Department of Chemistry, Faculty of Science, Hacettepe University, Ankara, Turkey
| | - Bekir Salih
- Department of Chemistry, Faculty of Science, Hacettepe University, Ankara, Turkey
| | - Gülay Ertaş
- Department of Chemistry, Faculty of Arts and Science, Middle East Technical University, Ankara, Turkey
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Lei X, Peng Y, Li Y, Chen Q, Shen Z, Yin W, Lemiasheuski V, Xu S, He J. Effects of selenium nanoparticles produced by Lactobacillus acidophilus HN23 on lipid deposition in WRL68 cells. Bioorg Chem 2024; 145:107165. [PMID: 38367427 DOI: 10.1016/j.bioorg.2024.107165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Revised: 01/14/2024] [Accepted: 01/28/2024] [Indexed: 02/19/2024]
Abstract
Selenium is an essential trace element for most organisms, protecting cells from oxidative damage caused by free radicals and serving as an adjunctive treatment for non-alcoholic fatty liver disease (NAFLD). In this study, We used the lactic acid bacterium Lactobacillus acidophilus HN23 to reduce tetra-valent sodium selenite into particulate matter, and analyzed it through inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscopy (SEM), X-ray diffraction energy dispersive spectrometry (EDS), and Fourier transform infrared spectroscopy (FTIR). We found that it consisted of selenium nanoparticles (SeNPs) with a mass composition of 65.8 % zero-valent selenium and some polysaccharide and polypeptide compounds, with particle sizes ranging from 60 to 300 nm. We also detected that SeNPs were much less toxic to cells than selenite. We further used free fatty acids (FFA)-induced WRL68 fatty liver cell model to study the therapeutic effect of SeNPs on NAFLD. The results show that SeNPs are more effective than selenite in reducing lipid deposition, increasing mitochondrial membrane potential (MMP) and antioxidant capacity of WRL68 cells, which is attributed to the chemical valence state of selenium and organic composition in SeNPs. In conclusion, SeNPs produced by probiotics L. acidophilus had the potential to alleviate NAFLD by reducing hepatocyte lipid deposition and oxidative damage. This study may open a new avenue for SeNPs drug development to treat NAFLD.
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Affiliation(s)
- Xianglan Lei
- National Key Laboratory of Agricultural Microbiology & Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan 430070, China; College of Tropical Agricultural Technology, Hainan Vocational University, Haikou 570100, China
| | - Yuxuan Peng
- National Key Laboratory of Agricultural Microbiology & Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan 430070, China; College of Tropical Agricultural Technology, Hainan Vocational University, Haikou 570100, China; Faculty of Biology, Belarusian State University, 220030 Minsk, Belarus
| | - Yan Li
- International Sakharov Environmental Institute, Belarusian State University, 220030 Minsk, Belarus
| | - Qianyuan Chen
- National Key Laboratory of Agricultural Microbiology & Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan 430070, China
| | - Zhenguo Shen
- College of Tropical Agricultural Technology, Hainan Vocational University, Haikou 570100, China
| | - Wen Yin
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Indus-trial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Viktar Lemiasheuski
- International Sakharov Environmental Institute, Belarusian State University, 220030 Minsk, Belarus; All-Russian Research Institute of Physiology, Biochemistry and Nutrition of Animals - Branch of the Federal Research Center for Animal Husbandry Named After Academy Member L. K. Ernst, Institute, 249013, Borovsk, Russian Federation
| | - Siyang Xu
- National Key Laboratory of Agricultural Microbiology & Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan 430070, China.
| | - Jin He
- National Key Laboratory of Agricultural Microbiology & Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan 430070, China.
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Qiao L, Dou X, Song X, Chang J, Zeng X, Zhu L, Xu C. Selenite Bioremediation by Food-Grade Probiotic Lactobacillus casei ATCC 393: Insights from Proteomics Analysis. Microbiol Spectr 2023; 11:e0065923. [PMID: 37219421 PMCID: PMC10269480 DOI: 10.1128/spectrum.00659-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 05/04/2023] [Indexed: 05/24/2023] Open
Abstract
Microorganisms capable of converting toxic selenite into elemental selenium (Se0) are considered an important and effective approach for bioremediation of Se contamination. In this study, we investigated the mechanism of reducing selenite to Se0 and forming Se nanoparticles (SeNPs) by food-grade probiotic Lactobacillus casei ATCC 393 (L. casei ATCC 393) through proteomics analysis. The results showed that selenite added during the exponential growth period of bacteria has the highest reduction efficiency, and 4.0 mM selenite decreased by nearly 95% within 72 h and formed protein-capped-SeNPs. Proteomics analysis revealed that selenite induced a significant increase in the expression of glutaredoxin, oxidoreductase, and ATP binding cassette (ABC) transporter, which can transport glutathione (GSH) and selenite. Selenite treatment significantly increased the CydC and CydD (putative cysteine and glutathione importer, ABC transporter) mRNA expression level, GSH content, and GSH reductase activity. Furthermore, supplementation with an additional GSH significantly increased the reduction rate of selenite, while GSH depletion significantly inhibited the reduction of selenite, indicating that GSH-mediated Painter-type reaction may be the main pathway of selenite reduction in L. casei ATCC 393. Moreover, nitrate reductase also participates in the reduction process of selenite, but it is not the primary factor. Overall, L. casei ATCC 393 effectively reduced selenite to SeNPs by GSH and nitrate reductase-mediated reduction pathway, and the GSH pathway played the decisive role, which provides an environmentally friendly biocatalyst for the bioremediation of Se contamination. IMPORTANCE Due to the high solubility and bioavailability of selenite, and its widespread use in industrial and agricultural production, it is easy to cause selenite to accumulate in the environment and reach toxic levels. Although the bacteria screened from special environments have high selenite tolerance, their safety has not been fully verified. It is necessary to screen out strains with selenite-reducing ability from nonpathogenic, functionally known, and widely used strains. Herein, we found food-grade probiotic L. casei ATCC 393 effectively reduced selenite to SeNPs by GSH and nitrate reductase-mediated reduction pathway, which provides an environmentally friendly biocatalyst for the bioremediation of Se contamination.
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Affiliation(s)
- Lei Qiao
- School of Life Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi, China
| | - Xina Dou
- School of Life Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi, China
| | - Xiaofan Song
- School of Life Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi, China
| | - Jiajing Chang
- School of Life Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi, China
| | - Xiaonan Zeng
- School of Life Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi, China
| | - Lixu Zhu
- School of Life Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi, China
| | - Chunlan Xu
- School of Life Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi, China
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Wu M, Teng X, Liang X, Zhang Y, Huang Z, Yin Y. Supporting nanoscale zero-valent iron onto shrimp shell-derived N-doped biochar to boost its reactivity and electron utilization for selenite sequestration. Chemosphere 2023; 319:137979. [PMID: 36736475 DOI: 10.1016/j.chemosphere.2023.137979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 12/05/2022] [Accepted: 01/26/2023] [Indexed: 06/18/2023]
Abstract
Nanoscale zero-valent iron (nZVI) has been widely used in the reductive removal of contaminants from water, yet it still fights against the inherent passive cover and the raise of medium pH. In this study, nZVI was supported onto a nitrogen-doped biochar (NBC) that was prepared by pyrolyzing shrimp shell for efficiently sequestrating aqueous selenite (Se(IV)). The resultant composite (NBC-nZVI) revealed a higher reactivity and electron utilization efficiency (EUE) than the bare nZVI in Se(IV) sequestration because of the positive charge, the buffering effect and the good conductivity of NBC. The kinetic rate and EUE of NBC-nZVI were increased by 143.4% and 15.3% compared to the bare nZVI, respectively, at initial pH of 3.0. The high removal capacity of 605.4 mg g-1 for NBC-nZVI was obtained at Se(IV) concentration of 1000 mg L-1, initial pH of 3.0, NBC-nZVI dosage of 1.0 g L-1 and contact time of 12 h. Moreover, NBC-nZVI exhibited a strong tolerance to solution pHs and coexisting compounds (e.g., humic acid) and could reduce the Se(IV) concentration from 5.0 mg L-1 to below the limit of drinking water (50 μg L-1) in real-world samples. This work exemplified a utilization of shrimp shell-derived NBC to simultaneously enhance the reactivity and EUE of nZVI for reductively removing contaminants.
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Affiliation(s)
- Mingyu Wu
- Guangxi Key Laboratory of Green Chemical Materials and Safety Technology, School of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou, 535011, China; School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China
| | - Xin Teng
- Guangxi Key Laboratory of Green Chemical Materials and Safety Technology, School of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou, 535011, China; School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China
| | - Xingtang Liang
- Guangxi Key Laboratory of Green Chemical Materials and Safety Technology, School of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou, 535011, China.
| | - Yanjun Zhang
- Guangxi Key Laboratory of Green Chemical Materials and Safety Technology, School of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou, 535011, China
| | - Zuqiang Huang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China
| | - Yanzhen Yin
- Guangxi Key Laboratory of Green Chemical Materials and Safety Technology, School of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou, 535011, China.
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Poulain A, Fernandez-Martinez A, Greneche JM, Prieur D, Scheinost AC, Menguy N, Bureau S, Magnin V, Findling N, Drnec J, Martens I, Mirolo M, Charlet L. Selenium Nanowire Formation by Reacting Selenate with Magnetite. Environ Sci Technol 2022; 56:14817-14827. [PMID: 36184803 DOI: 10.1021/acs.est.1c08377] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The mobility of 79Se, a fission product of 235U and long-lived radioisotope, is an important parameter in the safety assessment of radioactive nuclear waste disposal systems. Nonradioactive selenium is also an important contaminant of drainage waters from black shale mountains and coal mines. Highly mobile and soluble in its high oxidation states, selenate (Se(VI)O42-) and selenite (Se(IV)O32-) oxyanions can interact with magnetite, a mineral present in anoxic natural environments and in steel corrosion products, thereby being reduced and consequently immobilized by forming low-solubility solids. Here, we investigated the sorption and reduction capacity of synthetic nanomagnetite toward Se(VI) at neutral and acidic pH, under reducing, oxygen-free conditions. The additional presence of Fe(II)aq, released during magnetite dissolution at pH 5, has an effect on the reduction kinetics. X-ray absorption spectroscopy analyses revealed that, at pH 5, trigonal gray Se(0) formed and that sorbed Se(IV) complexes remained on the nanoparticle surface during longer reaction times. The Se(0) nanowires grew during the reaction, which points to a complex transport mechanism of reduced species or to active reduction sites at the tip of the Se(0) nanowires. The concomitant uptake of aqueous Fe(II) and Se(VI) ions is interpreted as a consequence of small pH oscillations that result from the Se(VI) reduction, leading to a re-adsorption of aqueous Fe(II) onto the magnetite, renewing its reducing capacity. This effect is not observed at pH 7, where we observed only the formation of Se(0) with slow kinetics due to the formation of an oxidized maghemite layer. This indicates that the presence of aqueous Fe(II) may be an important factor to be considered when examining the environmental reactivity of magnetite.
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Affiliation(s)
- Agnieszka Poulain
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000Grenoble, France
| | | | - Jean-Marc Greneche
- Institut des Molécules et Matériaux du Mans, CNRS UMR-6283, Le Mans Université, F-72085Le Mans, France
| | - Damien Prieur
- The Rossendorf Beamline at ESRF, 71 avenue des Martyrs, 38043 Grenoble, France and HZDR Institute of Resource Ecology, Bautzener Landstrasse 400, 01328Dresden, Germany
| | - Andreas C Scheinost
- The Rossendorf Beamline at ESRF, 71 avenue des Martyrs, 38043 Grenoble, France and HZDR Institute of Resource Ecology, Bautzener Landstrasse 400, 01328Dresden, Germany
| | - Nicolas Menguy
- Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, IRD. Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), 4 Place Jussieu, 75005Paris, France
| | - Sarah Bureau
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000Grenoble, France
| | - Valérie Magnin
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000Grenoble, France
| | - Nathaniel Findling
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000Grenoble, France
| | - Jakub Drnec
- ESRF, 71 avenue des Martyrs, 38043Grenoble, France
| | | | - Marta Mirolo
- ESRF, 71 avenue des Martyrs, 38043Grenoble, France
| | - Laurent Charlet
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000Grenoble, France
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Shimizu A, Tobe R, Aono R, Inoue M, Hagita S, Kiriyama K, Toyotake Y, Ogawa T, Kurihara T, Goto K, Prakash NT, Mihara H. Initial Step of Selenite Reduction via Thioredoxin for Bacterial Selenoprotein Biosynthesis. Int J Mol Sci 2021; 22:ijms222010965. [PMID: 34681630 PMCID: PMC8538045 DOI: 10.3390/ijms222010965] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/05/2021] [Accepted: 10/08/2021] [Indexed: 12/11/2022] Open
Abstract
Many organisms reductively assimilate selenite to synthesize selenoprotein. Although the thioredoxin system, consisting of thioredoxin 1 (TrxA) and thioredoxin reductase with NADPH, can reduce selenite and is considered to facilitate selenite assimilation, the detailed mechanism remains obscure. Here, we show that selenite was reduced by the thioredoxin system from Pseudomonas stutzeri only in the presence of the TrxA (PsTrxA), and this system was specific to selenite among the oxyanions examined. Mutational analysis revealed that Cys33 and Cys36 residues in PsTrxA are important for selenite reduction. Free thiol-labeling assays suggested that Cys33 is more reactive than Cys36. Mass spectrometry analysis suggested that PsTrxA reduces selenite via PsTrxA-SeO intermediate formation. Furthermore, an in vivo formate dehydrogenase activity assay in Escherichia coli with a gene disruption suggested that TrxA is important for selenoprotein biosynthesis. The introduction of PsTrxA complemented the effects of TrxA disruption in E. coli cells, only when PsTrxA contained Cys33 and Cys36. Based on these results, we proposed the early steps of the link between selenite and selenoprotein biosynthesis via the formation of TrxA–selenium complexes.
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Affiliation(s)
- Atsuki Shimizu
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Ryuta Tobe
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Riku Aono
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Masao Inoue
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
- R-GIRO, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan
| | - Satoru Hagita
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Kaito Kiriyama
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Yosuke Toyotake
- Institute for Chemical Research, Kyoto University, Gokasho, Uji 611-0011, Kyoto, Japan; (Y.T.); (T.O.); (T.K.)
| | - Takuya Ogawa
- Institute for Chemical Research, Kyoto University, Gokasho, Uji 611-0011, Kyoto, Japan; (Y.T.); (T.O.); (T.K.)
| | - Tatsuo Kurihara
- Institute for Chemical Research, Kyoto University, Gokasho, Uji 611-0011, Kyoto, Japan; (Y.T.); (T.O.); (T.K.)
| | - Kei Goto
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan;
| | - N. Tejo Prakash
- School of Energy and Environment, Thapar Institute of Engineering and Technology, Patiala 147004, Punjab, India;
| | - Hisaaki Mihara
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
- Correspondence: ; Tel.: +81-(0)77-561-2732
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Matulová M, Bujdoš M, Miglierini MB, Cesnek M, Duborská E, Mosnáčková K, Vojtková H, Kmječ T, Dekan J, Matúš P, Urík M. The Effect of High Selenite and Selenate Concentrations on Ferric Oxyhydroxides Transformation under Alkaline Conditions. Int J Mol Sci 2021; 22:9955. [PMID: 34576122 PMCID: PMC8466294 DOI: 10.3390/ijms22189955] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 09/03/2021] [Accepted: 09/13/2021] [Indexed: 11/16/2022] Open
Abstract
Iron-based nanomaterials have high technological impacts on various pro-environmental applications, including wastewater treatment using the co-precipitation method. The purpose of this research was to identify the changes of iron nanomaterial's structure caused by the presence of selenium, a typical water contaminant, which might affect the removal when the iron co-precipitation method is used. Therefore, we have investigated the maturation of co-precipitated nanosized ferric oxyhydroxides under alkaline conditions and their thermal transformation into hematite in the presence of selenite and selenate with high concentrations. Since the association of selenium with precipitates surfaces has been proven to be weak, the mineralogy of the system was affected insignificantly, and the goethite was identified as an only ferric phase in all treatments. However, the morphology and the crystallinity of ferric oxyhydroxides was slightly altered. Selenium affected the structural order of precipitates, especially at the initial phase of co-precipitation. Still, the crystal integrity and homogeneity increased with time almost constantly, regardless of the treatment. The thermal transformation into well crystalized hematite was more pronounced in the presence of selenite, while selenate-treated and selenium-free samples indicated the presence of highly disordered fraction. This highlights that the aftermath of selenium release does not result in destabilization of ferric phases; however, since weak interactions of selenium are dominant at alkaline conditions with goethite's surfaces, it still poses a high risk for the environment. The findings of this study should be applicable in waters affected by mining and metallurgical operations.
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Affiliation(s)
- Michaela Matulová
- Institute of Laboratory Research on Geomaterials, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, Ilkovičova 6, 84215 Bratislava, Slovakia; (M.M.); (M.B.); (E.D.); (P.M.)
| | - Marek Bujdoš
- Institute of Laboratory Research on Geomaterials, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, Ilkovičova 6, 84215 Bratislava, Slovakia; (M.M.); (M.B.); (E.D.); (P.M.)
| | - Marcel B. Miglierini
- Institute of Nuclear and Physical Engineering, Slovak Technical University in Bratislava, Ilkovičova 3, 81219 Bratislava, Slovakia; (M.B.M.); (J.D.)
- Department of Nuclear Reactors, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, V Holešovičkách 2, 18000 Prague, Czech Republic;
| | - Martin Cesnek
- Department of Nuclear Reactors, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, V Holešovičkách 2, 18000 Prague, Czech Republic;
| | - Eva Duborská
- Institute of Laboratory Research on Geomaterials, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, Ilkovičova 6, 84215 Bratislava, Slovakia; (M.M.); (M.B.); (E.D.); (P.M.)
| | - Katarína Mosnáčková
- Polymer Institute, Slovak Academy of Sciences, Dúbravská Cesta 9, 84541 Bratislava, Slovakia;
| | - Hana Vojtková
- Department of Environmental Engineering, Faculty of Mining and Geology, VŠB—Technical University of Ostrava, 17 Listopadu 15/2172, 70800 Ostrava-Poruba, Czech Republic;
| | - Tomáš Kmječ
- Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000 Prague, Czech Republic;
| | - Július Dekan
- Institute of Nuclear and Physical Engineering, Slovak Technical University in Bratislava, Ilkovičova 3, 81219 Bratislava, Slovakia; (M.B.M.); (J.D.)
| | - Peter Matúš
- Institute of Laboratory Research on Geomaterials, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, Ilkovičova 6, 84215 Bratislava, Slovakia; (M.M.); (M.B.); (E.D.); (P.M.)
| | - Martin Urík
- Institute of Laboratory Research on Geomaterials, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, Ilkovičova 6, 84215 Bratislava, Slovakia; (M.M.); (M.B.); (E.D.); (P.M.)
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García DA, Mendoza L, Vizuete K, Debut A, Arias MT, Gavilanes A, Terencio T, Ávila E, Jeffryes C, Dahoumane SA. Sugar-Mediated Green Synthesis of Silver Selenide Semiconductor Nanocrystals under Ultrasound Irradiation. Molecules 2020; 25:E5193. [PMID: 33171592 PMCID: PMC7664687 DOI: 10.3390/molecules25215193] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 11/02/2020] [Accepted: 11/05/2020] [Indexed: 12/27/2022] Open
Abstract
Silver selenide (Ag2Se) is a promising nanomaterial due to its outstanding optoelectronic properties and countless bio-applications. To the best of our knowledge, we report, for the first time, a simple and easy method for the ultrasound-assisted synthesis of Ag2Se nanoparticles (NPs) by mixing aqueous solutions of silver nitrate (AgNO3) and selenous acid (H2SeO3) that act as Ag and Se sources, respectively, in the presence of dissolved fructose and starch that act as reducing and stabilizing agents, respectively. The concentrations of mono- and polysaccharides were screened to determine their effect on the size, shape and colloidal stability of the as-synthesized Ag2Se NPs which, in turn, impact the optical properties of these NPs. The morphology of the as-synthesized Ag2Se NPs was characterized by transmission electron microscopy (TEM) and both α- and β-phases of Ag2Se were determined by X-ray diffraction (XRD). The optical properties of Ag2Se were studied using UV-Vis spectroscopy and its elemental composition was determined non-destructively using scanning electron microscopy-energy-dispersive spectroscopy (SEM-EDS). The biological activity of the Ag2Se NPs was assessed using cytotoxic and bactericidal approaches. Our findings pave the way to the cost-effective, fast and scalable production of valuable Ag2Se NPs that may be utilized in numerous fields.
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Affiliation(s)
- Daniela Armijo García
- School of Biological Sciences and Engineering, Yachay Tech, San Miguel de Urcuquí 100650, Ecuador;
| | - Lupe Mendoza
- School of Biological Sciences and Engineering, Yachay Tech, San Miguel de Urcuquí 100650, Ecuador;
| | - Karla Vizuete
- Center of Nanoscience and Nanotechnology, Universidad de las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador; (K.V.); (A.D.); (M.T.A.); (A.G.)
| | - Alexis Debut
- Center of Nanoscience and Nanotechnology, Universidad de las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador; (K.V.); (A.D.); (M.T.A.); (A.G.)
| | - Marbel Torres Arias
- Center of Nanoscience and Nanotechnology, Universidad de las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador; (K.V.); (A.D.); (M.T.A.); (A.G.)
| | - Alex Gavilanes
- Center of Nanoscience and Nanotechnology, Universidad de las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador; (K.V.); (A.D.); (M.T.A.); (A.G.)
| | - Thibault Terencio
- School of Chemical Sciences and Engineering, Yachay Tech, San Miguel de Urcuquí 100650, Ecuador; (T.T.); (E.Á.)
| | - Edward Ávila
- School of Chemical Sciences and Engineering, Yachay Tech, San Miguel de Urcuquí 100650, Ecuador; (T.T.); (E.Á.)
| | - Clayton Jeffryes
- Center for Advances in Water and Air Quality & The Dan F. Smith Department of Chemical & Biomolecular Engineering, Lamar University, Beaumont, TX 77710, USA;
| | - Si Amar Dahoumane
- School of Biological Sciences and Engineering, Yachay Tech, San Miguel de Urcuquí 100650, Ecuador;
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9
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Xue M, Wang D, Zhou F, Du Z, Zhai H, Wang M, Dinh QT, Tran TAT, Li H, Yan Y, Liang D. Effects of selenium combined with zinc amendment on zinc fractions and bioavailability in calcareous soil. Ecotoxicol Environ Saf 2020; 190:110082. [PMID: 31855791 DOI: 10.1016/j.ecoenv.2019.110082] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Revised: 11/13/2019] [Accepted: 12/10/2019] [Indexed: 06/10/2023]
Abstract
Selenium (Se) and zinc (Zn) are two important trace elements for human being and animals. The interaction between Se and Zn on the bioavailability of Zn in soil is still unclear. Therefore, pot experiments exposed to different dosages of zinc sulfate (ZnSO4) (0, 20, and 50 mg/kg soil) and sodium selenite (Na2SeO3) (0, 0.5, 1.0, and 2.5 mg/kg soil) were conducted to investigate the effects of selenite application on Zn bioavailability in calcareous soil and its related mechanisms. The total Zn content of different tissues (roots and shoots) of pak choi (Brassica chinensis L.) and the changes in Zn fraction distribution in soil before planting and after harvest were determined, and the mobility factor (MF) and distribution index (DI) of Zn in soils were calculated. In addition, the Pearson correlation and path analysis were conducted to clarify the relationships between Zn fractions in soil and the Zn uptake of pak choi. Results showed that Se amendment elevated soil Zn bioavailability at appropriate levels of Se and Zn. When 1.0 and 2.5 mg/kg of Se and 20 mg/kg of Zn were applied in soil, the proportion of exchangeable Zn (Ex-Zn) and Zn weakly bound to organic matter (Wbo-Zn) to the total content of Zn was significantly increased by 28.14%-82.52% compared with that of the corresponding single Zn treatment. Therefore, the Zn concentration in the shoots of pak choi was significantly increased by 27.2%-31.1%. High Zn (50 mg/kg) and Se co-amended treatments showed no significantly beneficial effect on the bioavailability of Zn. In addition, the potential available Zn content in soil (weakly bound to organic matter and carbonate bound Zn) and MF and DI values were all positively correlated with the Zn concentrations in pak choi, indicating that these indexes can be used to predict the bioavailability of Zn in soil. This study can provide a good reference for Se and Zn biofortification of plants in calcareous soil.
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Affiliation(s)
- Mingyue Xue
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Dan Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Fei Zhou
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Zekun Du
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Hui Zhai
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Mengke Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Quang Toan Dinh
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Thi Anh Thu Tran
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Huinan Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Ying Yan
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Dongli Liang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, China.
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Negi BB, Sinharoy A, Pakshirajan K. Selenite removal from wastewater using fungal pelleted airlift bioreactor. Environ Sci Pollut Res Int 2020; 27:992-1003. [PMID: 31820239 DOI: 10.1007/s11356-019-06946-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 11/01/2019] [Indexed: 06/10/2023]
Abstract
This study investigated the removal of selenite from wastewater using the fungus Asergillus niger KP isolated from a laboratory scale inverse fluidized bed bioreactor. The effect of different carbon sources and initial selenite concentration on fungal growth, pellet formation and selenite removal was first examined in a batch system. The fungal strain showed a maximum selenite removal efficiency of 86% in the batch system. Analysis of the fungal pellets by field-emission scanning electron microscopy, field-emission transmission electron microscopy and energy-dispersive X-ray spectroscopy revealed the formation of spherical-shaped elemental selenium nanoparticles of size 65-100 nm. An increase in the initial selenite concentration in the media resulted in compact pellets with smooth hyphae structure, whereas the fungal pellets contained hair like hyphae structure when grown in the absence of selenite. Besides, a high initial selenite concentration reduced biomass growth and selenite removal from solution. Using an airlift reactor with fungal pellets, operated under continuous mode, a maximum selenite removal of 94.3% was achieved at 10 mg L-1 of influent selenite concentration and 72 h HRT (hydraulic retention time). Overall, this study demonstrated very good potential of the fungal-pelleted airlift bioreactor system for removal of selenite from wastewater. Graphical abstract.
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Affiliation(s)
- Bharat Bhushan Negi
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Arindam Sinharoy
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Kannan Pakshirajan
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India.
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11
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He H, Liu J, Dong Y, Li H, Zhao S, Wang J, Jia M, Zhang H, Liao J, Yang J, Yang Y, Liu N. Sorption of selenite on Tamusu clay in simulated groundwater with high salinity under aerobic/anaerobic conditions. J Environ Radioact 2019; 203:210-219. [PMID: 30927564 DOI: 10.1016/j.jenvrad.2019.03.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Revised: 03/12/2019] [Accepted: 03/16/2019] [Indexed: 06/09/2023]
Abstract
The sorption behavior of selenite onto the Tamusu clay from a preselected high-level radioactive waste disposal site in Inner Mongolia, China, was first investigated in simulated groundwater with high salinity by batch sorption experiments under aerobic/anaerobic conditions. The results demonstrated that the Kd values rapidly decreased and then remained steady in the pH range of 2.0-8.0. However, selenite sorption was promoted when pH exceeded 8.0, which might be attributed to the coprecipitation between Ca2+ and SeO32-. Besides, the change trend of the Kd values as functions of various parameters was not affected by oxygen. The sorption kinetics and isotherms could be well fitted by the pseudo-second-order kinetic model and the Freundlich model for both aerobic and anaerobic conditions, and the calculated thermodynamic parameters (△G and △H) suggested that the selenite sorption process was a spontaneous and endothermic process. Additionally, the XPS results revealed that Se(IV) could be reduced to Se (0) only in anaerobic conditions and that the different amounts of Fe on the clay surface led to the discrepancy of the Se(IV) Kd values under aerobic and anaerobic conditions even in high-salt simulated groundwater. Overall, our findings in this study are significant in regards to the retardation of selenite on the host rock under high salinity conditions.
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Affiliation(s)
- Hanyi He
- Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, PR China
| | - Jun Liu
- Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, PR China
| | - Yang Dong
- Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, PR China
| | - Honghui Li
- China Institute for Radiation Protection, Taiyuan, 030006, PR China
| | - Shuaiwei Zhao
- China Institute for Radiation Protection, Taiyuan, 030006, PR China
| | - Jing Wang
- Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, PR China
| | - Meilan Jia
- China Institute for Radiation Protection, Taiyuan, 030006, PR China
| | - Han Zhang
- Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, PR China
| | - Jiali Liao
- Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, PR China.
| | - Jijun Yang
- Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, PR China
| | - Yuanyou Yang
- Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, PR China
| | - Ning Liu
- Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, PR China.
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12
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Zhang G, Gomez MA, Yao S, Ma X, Li S, Cao X, Zang S, Jia Y. Systematic study on the reduction efficiency of ascorbic acid and thiourea on selenate and selenite at high and trace concentrations. Environ Sci Pollut Res Int 2019; 26:10159-10173. [PMID: 30746628 DOI: 10.1007/s11356-019-04383-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 01/24/2019] [Indexed: 06/09/2023]
Abstract
Selenate (Se(VI)) and selenite (Se(IV)) are common soluble wastewater pollutants in natural and anthropogenic systems. We evaluated the reduction efficiency and removal of low (0.02 and 2 mg/L) and high (20 and 200 mg/L) Se(IV)(aq) and Se(VI)(aq) concentrations to elemental (Se0) via the use of ascorbic acid (AA), thiourea (TH), and a 50-50% mixture. The reduction efficiency of AA with Se(IV)(aq) to nano- and micro-crystalline Se0 was ≥ 95%, but ≤ 5% of Se(VI)(aq) was reduced to Se(IV)(aq) with no Se0. Thiourea was able to reduce ≤ 75% of Se(IV)(aq) to bulk Se0 at lower concentrations but was more effective (≥ 90%) at higher concentrations. Reduction of Se(VI)(aq)→Se (IV)(aq) with TH was ≤ 75% at trace concentrations which steadily declined as the concentrations increased, and the products formed were elemental sulfur (S0) and SnSe8-n phases. The reduction efficiency of Se(IV)(aq) to bulk Se0 upon the addition of AA+TH was ≤ 81% at low concentrations and ≥ 90% at higher concentrations. An inverse relation to what was observed with Se(IV)(aq) was found upon the addition of AA+TH with Se(VI)(aq). At low Se(VI)(aq) concentrations, AA+TH was able to reduce more effectively (≤ 61%) Se(VI)(aq)→Se(IV)(aq)→Se0, while at higher concentrations, it was ineffective (≤ 11%) and Se0, S0, and SnSe8-n formed. This work helps to guide the removal, reduction effectiveness, and products formed from AA, TH, and a 50-50% mixture on Se(IV)(aq) and Se(VI)(aq) to Se0 under acidic conditions and environmentally relevant concentrations possibly found in acidic natural waters, hydrometallurgical chloride processing operations, and acid mine drainage/acid rock drainage tailings. Graphical Abstract ᅟ.
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Affiliation(s)
- Gongli Zhang
- Institute of Environment Protection, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Mario Alberto Gomez
- Institute of Environment Protection, Shenyang University of Chemical Technology, Shenyang, 110142, China.
| | - Shuhua Yao
- Institute of Environment Protection, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Xu Ma
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Shifen Li
- Institute of Environment Protection, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Xuan Cao
- Institute of Environment Protection, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Shuyan Zang
- Institute of Environment Protection, Shenyang University of Chemical Technology, Shenyang, 110142, China
| | - Yongfeng Jia
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China.
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13
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Jacobson AT, Fan M. Evaluation of natural goethite on the removal of arsenate and selenite from water. J Environ Sci (China) 2019; 76:133-141. [PMID: 30528005 DOI: 10.1016/j.jes.2018.04.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 04/17/2018] [Accepted: 04/18/2018] [Indexed: 06/09/2023]
Abstract
Elevated arsenic and selenium concentrations in water cause health problems to both humans and wildlife. Natural and anthropogenic activities have caused contamination of these elements in waters worldwide, making the development of efficient cost-effective methods in their removal essential. In this work, removal of arsenate and selenite from water by adsorption onto a natural goethite (α-FeOOH) sample was studied at varying conditions. The data was then compared with other arsenate, selenite/goethite adsorption systems as much of literature shows discrepancies due to varying adsorption conditions. Characterization of the goethite was completed using inductively coupled plasma mass spectrometry, X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and Brunauer-Emmett-Teller surface area analysis. Pseudo-first order (PFO) and pseudo-second order (PSO) kinetic models were applied; including comparisons of different regression methods. Various adsorption isotherm models were applied to determine the best fitting model and to compare adsorption capacitates with other works. Desorption/leaching of arsenate and selenite was studied though the addition of phosphate and hydroxyl ions. Langmuir isotherm modeling resulted in maximum adsorption capacities of 6.204 and 7.740 mg/g for arsenate and selenite adsorption, respectively. The PSO model applied with a non-linear regression resulted in the best kinetic fits for both adsorption and desorption of arsenate and selenite. Adsorption decreased with increasing pH. Phosphate induced desorption resulted in the highest percentage of arsenate and selenite desorbed, while hydroxide induced resulted in the fastest desorption kinetics.
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Affiliation(s)
- Andrew T Jacobson
- Department of Chemical Engineering, University of Wyoming, Laramie, WY 82071, USA
| | - Maohong Fan
- Department of Chemical Engineering, University of Wyoming, Laramie, WY 82071, USA.
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14
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Yu Y, Fu P, Huang Q, Zhang J, Li H. Accumulation, subcellular distribution, and oxidative stress of cadmium in Brassica chinensis supplied with selenite and selenate at different growth stages. Chemosphere 2019; 216:331-340. [PMID: 30384302 DOI: 10.1016/j.chemosphere.2018.10.138] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 10/15/2018] [Accepted: 10/19/2018] [Indexed: 06/08/2023]
Abstract
Despite not being an essential element for plants, Se has been proved to reduce Cd accumulation and Cd-induced oxidative stress, although the underlying mechanisms are not fully understood. A pak choi hydroponic experiment was conducted to investigate the effects of Se on Cd accumulation, subcellular distribution, and Cd-induced oxidative stress at different growth stages. The results showed that on day 19 after germination, Cd content was significantly reduced by 32% by selenite, but was increased by 15% by selenate. Accordingly, selenite improved cell-wall Cd sequestration by 20%, whereas selenate caused enhanced translocation of Cd from the root to the shoot. However, the effects of selenite on the reduction in Cd accumulation and distribution in pak choi seedlings were completely dismissed on day 40. Nevertheless, both forms of Se enhanced antioxidative defense, as they both inhibited the accumulation of H2O2 and malondialdehyde. On day 19, ascorbate peroxidase and glutathione reductase activities were increased by more than 50% by selenite; additionally, superoxide dismutase, catalase, and peroxidase activities increased by up to 86%, 63%, and 24%, respectively, in the presence of selenite, when compared to Cd treatment alone. Activities of most of the antioxidants remained significantly unaffected by both forms of Se on day 40. Consequently, selenite and selenate affected Cd accumulation in pak choi seedlings by altering Cd subcellular distribution and by enhancing antioxidative defense, but such effects depended on the Se forms applied and the growth stage as well.
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Affiliation(s)
- Yao Yu
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of the Ministry of Education, College of Resources and Environmental Science, China Agricultural University, Beijing, 100193, PRC
| | - Pingnan Fu
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of the Ministry of Education, College of Resources and Environmental Science, China Agricultural University, Beijing, 100193, PRC
| | - Qingqing Huang
- Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin, 300191, PRC
| | - Jingsuo Zhang
- Beijing Municipal Station of Agro-Environmental Monitoring, Beijing, 100029, PRC
| | - Huafen Li
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of the Ministry of Education, College of Resources and Environmental Science, China Agricultural University, Beijing, 100193, PRC.
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Wang Y, Shu X, Hou J, Lu W, Zhao W, Huang S, Wu L. Selenium Nanoparticle Synthesized by Proteus mirabilis YC801: An Efficacious Pathway for Selenite Biotransformation and Detoxification. Int J Mol Sci 2018; 19:ijms19123809. [PMID: 30501097 PMCID: PMC6321198 DOI: 10.3390/ijms19123809] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 11/27/2018] [Accepted: 11/28/2018] [Indexed: 01/19/2023] Open
Abstract
Selenite is extremely biotoxic, and as a result of this, exploitation of microorganisms able to reduce selenite to non-toxic elemental selenium (Se0) has attracted great interest. In this study, a bacterial strain exhibiting extreme tolerance to selenite (up to 100 mM) was isolated from the gut of adult Monochamus alternatus and identified as Proteus mirabilis YC801. This strain demonstrated efficient transformation of selenite into red selenium nanoparticles (SeNPs) by reducing nearly 100% of 1.0 and 5.0 mM selenite within 42 and 48 h, respectively. Electron microscopy and energy dispersive X-ray analysis demonstrated that the SeNPs were spherical and primarily localized extracellularly, with an average hydrodynamic diameter of 178.3 ± 11.5 nm. In vitro selenite reduction activity assays and real-time PCR indicated that thioredoxin reductase and similar proteins present in the cytoplasm were likely to be involved in selenite reduction, and that NADPH or NADH served as electron donors. Finally, Fourier-transform infrared spectral analysis confirmed the presence of protein and lipid residues on the surfaces of SeNPs. This is the first report on the capability of P. mirabilis to reduce selenite to SeNPs. P. mirabilis YC801 might provide an eco-friendly approach to bioremediate selenium-contaminated soil/water, as well as a bacterial catalyst for the biogenesis of SeNPs.
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Affiliation(s)
- Yuting Wang
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institute of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- The Sericultural Research Institute, Anhui Academy of Agricultural Science, Hefei 230061, China.
- School of Life Sciences, University of Science and Technology of China, Hefei 230026, China.
| | - Xian Shu
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institute of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- School of Life Sciences, University of Science and Technology of China, Hefei 230026, China.
| | - Jinyan Hou
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institute of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
| | - Weili Lu
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institute of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- Anhui Key Laboratory of Bioactivity of Natural Products, School of Pharmacy, Anhui Medical University, Hefei 230032, China.
| | - Weiwei Zhao
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institute of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
| | - Shengwei Huang
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institute of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- Anhui Key Laboratory of Bioactivity of Natural Products, School of Pharmacy, Anhui Medical University, Hefei 230032, China.
| | - Lifang Wu
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institute of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
- School of Life Sciences, University of Science and Technology of China, Hefei 230026, China.
- Anhui Key Laboratory of Bioactivity of Natural Products, School of Pharmacy, Anhui Medical University, Hefei 230032, China.
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Wan YN, Liu Z, Aboubacar YC, Yu Y, Wang Q, Li HF. [Lead Uptake and Accumulation in Rice ( Oryza sativa L.) with Water Management and Selenite Fertilization]. Huan Jing Ke Xue 2018; 39:4759-4765. [PMID: 30229625 DOI: 10.13227/j.hjkx.201801231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Lead (Pb) accumulation in rice grains has been identified as a potential threat to human health. Our study investigated the effects of varied rates of selenite fertilization (0, 0.5 and 1.0 mg·kg-1) on the dynamics of Pb in soil solutions, and its uptake and translocation by rice under different water management scenarios (aerobic and flooded) in pot experiments. Plants were harvested at seedling stage and at maturity to determine the Pb contents, and soil solutions were extracted during the growing season to monitor the Pb dynamics. Results showed that flooding the soil significantly increased Pb concentrations in DCB extracts and rice roots both at seedling stage and maturity. Root Pb contents in flooded treatments were 4.2-8.5 and 1.4-1.5 times higher than those under aerobic conditions at rice seedling stage and maturity. Flooding also decreased the percentage of Pb in rice shoots. The Pb content in soil solutions, rice seedlings, rice roots and stems at maturity were significantly decreased by selenite additions. Relative to the control treatment, selenite additions decreased the rice root Pb contents by 5.4%-24.3% and 2.7%-61.7% under flooding and aerobic conditions at seedling stage, respectively; while decreased Pb in rice root by 56.1%-64.1% and 53.8%-63.2% respectively, at maturity. No significant differences existed in grain Pb levels among the treatments. Results demonstrated that water management regimes and selenite additions affected Pb uptake by rice roots significantly, but had no significant influence on Pb accumulation in rice grains.
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Affiliation(s)
- Ya-Nan Wan
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Zhe Liu
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Younoussa Camara Aboubacar
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Yao Yu
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Qi Wang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Hua-Fen Li
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China
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17
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He J, Shi Y, Yang X, Zhou W, Li Y, Liu C. Influence of Fe(II) on the Se(IV) sorption under oxic/anoxic conditions using bentonite. Chemosphere 2018; 193:376-384. [PMID: 29149714 DOI: 10.1016/j.chemosphere.2017.10.143] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 08/28/2017] [Accepted: 10/23/2017] [Indexed: 06/07/2023]
Abstract
79Se, one of the key radionuclides for nuclear waste disposal, threatens the quality of the environment, as well as human health. Therefore, it needs to be permanently isolated from the biosphere. The aim of the study was to investigate the effects of Fe(II)/Fe(III) on the removal of 79Se using bentonite in the pH range of 2.0-10.0 under oxic/anoxic conditions. Under oxic conditions, Se(IV) prefers to form inner-sphere complexes with Fe(III)-oxyhydroxide, derived from the oxidization of Fe(II) using oxygen. Interestingly, Se(IV) will interact with Fe(III) and form a poorly soluble ferric selenite at pH ∼4 under oxic conditions. Under anoxic conditions, however, the concentration of Fe(II) is closely related to the sorption process of Se(IV) on bentonite. When the concentration of Fe(II) was less than 1%, Fe(II) combined with the hydroxyl, forming Fe(OH)2, which generated a disproportionation at pH ∼8 and formed a new sorbent, Fe3O4. However, when the concentration of Fe(II) was increased to 5%, reduction precipitation was the primary way to remove Se(IV) in aqueous solution. XANES (X-ray Absorption Near Edge Structure) spectra showed that higher pH values are beneficial for the formation of the final thermodynamic reduction product, Fe selenide. These results suggested that Fe(II) significantly affect the Se(IV) sorption. Overall, this study confirmed the significant role of Fe(II) on the retardation of 79Se and on remediation for Se(IV) contamination in the hydrosphere.
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Affiliation(s)
- Jiangang He
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Yanlin Shi
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Xiaoyu Yang
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Wanqiang Zhou
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Yao Li
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Chunli Liu
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
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18
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Xia X, Wu S, Li N, Wang D, Zheng S, Wang G. Novel bacterial selenite reductase CsrF responsible for Se(IV) and Cr(VI) reduction that produces nanoparticles in Alishewanella sp. WH16-1. J Hazard Mater 2018; 342:499-509. [PMID: 28881274 DOI: 10.1016/j.jhazmat.2017.08.051] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Revised: 07/25/2017] [Accepted: 08/16/2017] [Indexed: 06/07/2023]
Abstract
Alishewanella sp. WH16-1 is a facultative anaerobic bacterium isolated from mining soil. Under aerobic conditions, this bacterium efficiently reduces selenite and chromate. A flavoprotein showing 37% amino acid identity to E. coli chromate reductase ChrR was identified from the genome (named CsrF). Gene mutation and complementation along with heterologous expression revealed the ability of CsrF to reduce selenite and chromate in vivo. The purified CsrF was yellow and showed an absorption spectra similar to that of FMN. The molecular weight of CsrF was 23,906 for the monomer and 47,960 for the dimer. In vitro, CsrF catalyzes the reduction of Se(IV) and Cr(VI) using NAD(P)H as cofactors with optimal condition of pH 7.0 and temperature of 30-37°C. This enzyme also catalyze the reduction of sulfate and ferric iron but not arsenate and nitrate. Using NADPH as its electron donor, the Km for the reduction of Se(IV) and Cr(VI) was 204.1±27.91 and 250.6±23.46μmol/L, respectively. Site-directed mutagenesis showed that Arg13 and Gly113 were essential for the reduction of Se(IV) and Cr(VI). The products of the reduction of Se(IV) and Cr(VI) were Se(0)- and Cr(III)-nanoparticles, respectively. To our knowledge, CsrF is a novel and well-characterized bacterial aerobic selenite reductase.
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Affiliation(s)
- Xian Xia
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China
| | - Shijuan Wu
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China
| | - Nuohan Li
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China
| | - Dan Wang
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China
| | - Shixue Zheng
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China
| | - Gejiao Wang
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China.
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Favorito JE, Eick MJ, Grossl PR. Adsorption of Selenite and Selenate on Ferrihydrite in the Presence and Absence of Dissolved Organic Carbon. J Environ Qual 2018; 47:147-155. [PMID: 29415109 DOI: 10.2134/jeq2017.09.0352] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This study examines selenite [Se(IV)] and selenate [Se(VI)] adsorption on two-line ferrihydrite in the presence and absence of two low-molecular-weight dissolved organic carbon (DOC) species, citric and salicylic acid. Ferrihydrite surface potential measurements were also examined to identify shifts in isoelectric points, which suggest possible adsorption mechanisms. Sorption was completed in batch reactor systems at environmentally relevant pH. Our results indicate citric acid suppressed both Se(IV) and Se(VI) sorption on ferrihydrite, which may be caused by competition. This was especially evident at pH 5 to 7 for Se(IV) and pH 5 to 6 for Se(VI). Little sorption suppression was observed for both Se species in the presence of salicylic acid. In the presence of Se(IV) and Se(VI), citric acid adsorption was reduced (pH 5-8). Salicylic acid sorption was almost completely suppressed in the presence of Se(IV) throughout the entire pH range examined, with minimal sorption occurring at pH 5. In the presence of Se(VI), the largest reduction in salicylic acid sorption occurred at pH 5 to 6. Small shifts in the surface potential of ferrihydrite at higher pH suggest that Se(VI) and salicylic acid form weak, outer-sphere complexes. However, at pH 5 and 6, there is a shift in the surface potential measurements to more negative values, indicating possible formation of stronger, inner-sphere complexes. Larger surface potential shifts for Se(IV) and citric acid suggest the formation of strong, inner-sphere complexes. This work demonstrates the ability of low-molecular-weight DOC species (particularly for citric acid) to increase Se(IV) and Se(VI) solubility through sorption suppression.
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20
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Constantino LV, Quirino JN, Monteiro AM, Abrão T, Parreira PS, Urbano A, Santos MJ. Sorption-desorption of selenite and selenate on Mg-Al layered double hydroxide in competition with nitrate, sulfate and phosphate. Chemosphere 2017; 181:627-634. [PMID: 28476002 DOI: 10.1016/j.chemosphere.2017.04.071] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Revised: 04/11/2017] [Accepted: 04/16/2017] [Indexed: 06/07/2023]
Abstract
Selenate and selenite are considered emerging contaminants and pose a risk to living organisms. Since selenium anion species are at low concentration in aquatic environments, materials for its retention are required to enable monitoring. Herein, hydrotalcite was calcined and characterised to investigate sorption and desorption of selenite and selenate in competition with nitrate, sulfate and phosphate. Sorption experiments were carried out in batch system and desorption by sequential dilution. Selenite and selenate concentration remaining after N desorption steps was determined by mass balance. The isotherms were adjusted to the dual-mode Langmuir-Freundlich model (R2 > 0.99). Maximum sorption capacity ranged from 494 to 563 meq kg-1 for selenite and from 609 to 659 meq kg-1 for selenate. Sulfate and phosphate ions showed greater competitive effect on the sorption of selenate and selenite, respectively. Low mobilization factors and high sorption efficiency (MF<3%; SE ≈ 100%) indicated that calcined hydrotalcite has the wanted characteristics for retention of relevant selenium anion species in aqueous media.
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Affiliation(s)
- Leonel Vinicius Constantino
- Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil
| | - Juliana Nunes Quirino
- Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil
| | - Alessandra Maffei Monteiro
- Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil
| | - Taufik Abrão
- Departamento de Engenharia Elétrica, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil
| | - Paulo Sérgio Parreira
- Departamento de Física, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil
| | - Alexandre Urbano
- Departamento de Física, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil
| | - Maria Josefa Santos
- Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil.
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Wang Y, Hao H, Zhang S. Biomimetic Coprecipitation of Silk Fibrin and Calcium Phosphate: Influence of Selenite Ions. Biol Trace Elem Res 2017; 178:338-347. [PMID: 28092074 DOI: 10.1007/s12011-017-0933-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 01/05/2017] [Indexed: 11/24/2022]
Abstract
Large bone defect creates an urgent need for osteogenic biomaterials. However, bone nonunion and infection are choke points in the therapy of this disease. How to recruit the mesenchymal stem cells to defect sites and increase the cell viability are the critical processes. One effective method was the fabrication of biomimetic silk fibrin/selenium-doped hydroxyapatite (SF/HASe) material, which could create a niche for cell proliferation. So, the aim of the present study was to seek a facile route to prepare this biocomposites and investigate the osteogenic capability. Results showed that the biomimetic coprecipitation was a successful route to prepare SF/HASe biocomposites, which presented higher cell proliferation activity and better modulation of the selenite release during incubation in biological medium. Besides, the biocomposites exhibited weird and porous pot morphology. Such features could provide large surface area for the cells and proteins to attach. Silk fibrin, adhered onto the surface of hydroxyapatite (HA) crystals, plays a crucial impact on the release profile of selenite ions. The release behavior of the selenite ions exhibited stably slow release fashion. Therefore, it is feasible to employ SF/HASe biocomposites to repair bone defects and apply into the therapy of osteosarcoma postoperatively.
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Affiliation(s)
- Yanhua Wang
- Medical Science College of China Three Gorges University, Life Science Building, No. 8 Daxue Road, Yichang, 443002, People's Republic of China.
| | - Hang Hao
- Advanced Biomaterials and Tissue Engineering Center, Huazhong University of Science and Technology, Wuhan, China
| | - Shengmin Zhang
- Advanced Biomaterials and Tissue Engineering Center, Huazhong University of Science and Technology, Wuhan, China
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22
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Oledzka E, Pachowska D, Orłowska K, Kolmas J, Drobniewska A, Figat R, Sobczak M. Pamidronate-Conjugated Biodegradable Branched Copolyester Carriers: Synthesis and Characterization. Molecules 2017; 22:molecules22071063. [PMID: 28672871 PMCID: PMC6151985 DOI: 10.3390/molecules22071063] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Accepted: 06/22/2017] [Indexed: 01/07/2023] Open
Abstract
The need for development of comprehensive therapeutic systems, (e.g., polymer-apatite composites) as a bone substitute material has previously been highlighted in many scientific reports. The aim of this study was to develop a new multifunctional composite based on hydroxyapatite porous granules doped with selenite ions (SeO₃2-) and a biodegradable branched copolymer-bisphosphonate conjugate as a promising bone substitute material for patients with bone tumours or bone metastasis. A series of biodegradable and branched copolymer matrices, adequate for delivery of bisphosphonate in the bone-deficient area were synthesized and physico-chemically and biologically (cyto- and genotoxicity assays) characterized. Branched copolymers were obtained using a hyperbranched bis-MPA polyester-16-hydroxyl initiator and Sn(Oct)₂, a (co)catalyst of the ring-opening polymerization (ROP) of l,l-lactide (LLA) and ε-caprolactone (CL). A new amide bond was formed between the hydroxyl end groups of the synthesized copolymer carriers and an amine group of pamidronate (PAM)-the drug inhibiting bone resorption and osteoclast activity in bone. The dependence of the physico-chemical properties of the copolymer matrices on the kinetic release of PAM from the synthesized branched copolymer conjugate-coated hydroxyapatite granules doped with selenite ions was observed. Moreover, the correlation of these results with the hydrolytic degradation data of the synthesized matrices was evidenced. Therefore, the developed composite porous hydroxyapatite doped with SeO₃2- ions/biodegradable copolymer-PAM conjugate appears most attractive as a bone substitute material for cancer patients.
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Affiliation(s)
- Ewa Oledzka
- Department of Biomaterials Chemistry, Chair of Inorganic and Analytical Chemistry, Medical University of Warsaw, Faculty of Pharmacy with the Laboratory Medicine Division, Banacha 1, 02-097 Warsaw, Poland.
| | - Dagmara Pachowska
- Department of Biomaterials Chemistry, Chair of Inorganic and Analytical Chemistry, Medical University of Warsaw, Faculty of Pharmacy with the Laboratory Medicine Division, Banacha 1, 02-097 Warsaw, Poland.
| | - Katarzyna Orłowska
- Department of Biomaterials Chemistry, Chair of Inorganic and Analytical Chemistry, Medical University of Warsaw, Faculty of Pharmacy with the Laboratory Medicine Division, Banacha 1, 02-097 Warsaw, Poland.
| | - Joanna Kolmas
- Department of Inorganic and Analytical Chemistry, Chair of Inorganic and Analytical Chemistry, Medical University of Warsaw, Faculty of Pharmacy with the Laboratory Medicine Division, Banacha 1, 02-097 Warsaw, Poland.
| | - Agata Drobniewska
- Department of Environmental Health Science, Medical University of Warsaw, Faculty of Pharmacy with the Laboratory Medicine Division, Banacha 1, 02-097 Warsaw, Poland.
| | - Ramona Figat
- Department of Environmental Health Science, Medical University of Warsaw, Faculty of Pharmacy with the Laboratory Medicine Division, Banacha 1, 02-097 Warsaw, Poland.
| | - Marcin Sobczak
- Department of Biomaterials Chemistry, Chair of Inorganic and Analytical Chemistry, Medical University of Warsaw, Faculty of Pharmacy with the Laboratory Medicine Division, Banacha 1, 02-097 Warsaw, Poland.
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23
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do Nascimento FH, Masini JC. An electrochemical sequential injection method to investigate the adsorption of selenite on Fe(III) polyhydroxy cations intercalated vermiculite. Water Sci Technol 2017; 2017:134-143. [PMID: 29698229 DOI: 10.2166/wst.2018.097] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A sequential injection - square wave anodic stripping voltammetry (SI-SWASV) method for determination of Se(IV) at a gold working electrode was developed to investigate the adsorption of Se(IV) onto vermiculite intercalated with Fe(III) polyhydroxy cations. The limits of detection and quantification were 0.060 and 0.20 μmol L-1, respectively (4.7 and 15.7 μg L-1). The linearity was up to 1.0 μmol L-1, and the sampling throughput was 18 analyses h-1. The proposed approach is a low-cost alternative to more expensive spectrometric methods. Adsorption onto vermiculite intercalated with Fe(III) polyhydroxy cations removed 93% of Se(IV) from a 1.0 μmol L-1 solution (250 mL) after 5 min of contact time with 625 mg of adsorbent. Adsorption isotherms (25.0 ± 0.5 °C) were fitted by the Freundlich equation resulting in 1/n = 0.51 ± 0.03 and Kf = (1.584 ± 0.002) × 103 μmol1-1/n g-1 L1/n (r2 = 0.995). Fitting by the Langmuir equation resulted in an adsorption constant of 0.026 ± 0.008 L g-1 and adsorption capacity of 47 ± 5 μmol g-1 (3.7 ± 0.4 mg g-1) (r2 = 0.97). This capacity was higher than that found for several other iron oxides, but lower than that obtained for oxide/hydroxide-based Fe(III) nanoparticles.
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Affiliation(s)
- Fernando H do Nascimento
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo, SP 05508-000, Brazil E-mail:
| | - Jorge Cesar Masini
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo, SP 05508-000, Brazil E-mail:
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24
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Lampis S, Zonaro E, Bertolini C, Cecconi D, Monti F, Micaroni M, Turner RJ, Butler CS, Vallini G. Selenite biotransformation and detoxification by Stenotrophomonas maltophilia SeITE02: Novel clues on the route to bacterial biogenesis of selenium nanoparticles. J Hazard Mater 2017; 324:3-14. [PMID: 26952084 DOI: 10.1016/j.jhazmat.2016.02.035] [Citation(s) in RCA: 93] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Revised: 02/06/2016] [Accepted: 02/14/2016] [Indexed: 05/02/2023]
Abstract
A putative biosynthetic mechanism for selenium nanoparticles (SeNPs) and efficient reduction of selenite (SeO32-) in the bacterial strain Stenotrophomonas maltophilia SeITE02 are addressed here on the basis of information gained by a combined approach relying on a set of physiological, chemical/biochemical, microscopy, and proteomic analyses. S. maltophilia SeITE02 is demonstrated to efficiently transform selenite into elemental selenium (Se°) by reducing 100% of 0.5mM of this toxic oxyanion to Se° nanoparticles within 48h growth, in liquid medium. Since the selenite reducing activity was detected in the cytoplasmic protein fraction, while biogenic SeNPs showed mainly extracellular localization, a releasing mechanism of SeNPs from the intracellular environment is hypothesized. SeNPs appeared spherical in shape and with size ranging from 160nm to 250nm, depending on the age of the cultures. Proteomic analysis carried out on the cytoplasmic fraction identified an alcohol dehydrogenase homolog, conceivably correlated with the biogenesis of SeNPs. Finally, by Fourier Transformed Infrared Spectrometry, protein and lipid residues were detected on the surface of biogenic SeNPs. Eventually, this strain might be efficaciously exploited for the remediation of selenite-contaminated environmental matrices due to its high SeO32- reducing efficiency. Biogenic SeNPs may also be considered for technological applications in different fields.
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Affiliation(s)
- Silvia Lampis
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy.
| | - Emanuele Zonaro
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Cristina Bertolini
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy; Biosciences, College of Life and Environmental Sciences, University of Exeter, Stocker Road, Exeter EX4 4QD, UK
| | - Daniela Cecconi
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Francesca Monti
- Department of Computer Science, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Massimo Micaroni
- Biosciences, College of Life and Environmental Sciences, University of Exeter, Stocker Road, Exeter EX4 4QD, UK
| | - Raymond J Turner
- Biofilm Research Group, Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada
| | - Clive S Butler
- Biosciences, College of Life and Environmental Sciences, University of Exeter, Stocker Road, Exeter EX4 4QD, UK
| | - Giovanni Vallini
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy
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25
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Xia X, Ling L, Zhang WX. Solution and surface chemistry of the Se(IV)-Fe(0) reactions: Effect of initial solution pH. Chemosphere 2017; 168:1597-1603. [PMID: 27939658 DOI: 10.1016/j.chemosphere.2016.11.150] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 11/21/2016] [Accepted: 11/29/2016] [Indexed: 06/06/2023]
Abstract
Aspects of solution and solid-phase reactions between selenite (Se(IV)) and nanoscale zero-valent iron (nZVI) were investigated. Experimental results on the effects of initial solution pH, formation and evolution of nZVI corrosion products, and speciation of selenium in nZVI were presented. In general, the rate of Se(IV) removal decreases with increasing initial pH. The observed rate constants of Se(IV) removal decreased from 0.3530 to 0.0364 min-1 as pH increased from 4.0 to 10.0. Composition and morphology of nZVI corrosion products and selenium species were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Results confirmed that Se(IV) was reduced to Se(0) and Se(-II) by nZVI. Lower solution pH favored further reduction of Se(0) to Se(-II). Amorphous FeOOH, magnetite/maghemite (Fe3O4/γ-Fe2O3) and ferrous hydroxide (Fe(OH)2) were identified as the main corrosion products. Under alkaline conditions, the corrosion products were mainly of Fe(OH)2 along with small amounts of Fe3O4, while nZVI in acidic solutions was oxidized to mostly Fe3O4 and amorphous FeOOH. Furthermore, these corrosion products acted as intermediates for electron transfer and reactive/sorptive sites for Se(IV) adsorption and reduction, thus played a crucial role in the removal of aqueous Se(IV).
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Affiliation(s)
- Xuefen Xia
- State Key Laboratory for Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China
| | - Lan Ling
- State Key Laboratory for Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China.
| | - Wei-Xian Zhang
- State Key Laboratory for Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China
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26
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Abstract
Mine drainage from the low-sulfur surface coal mines in southern West Virginia, USA, is circumneutral (pH > 6) but contains elevated selenium (Se) concentrations. Removal of selenite ions from aqueous solutions under anoxic condition at pH 6-8.5 by zero valent iron steel wool (ZVI-SW) was investigated in bench-scale kinetic experiments using wet chemical, microscopic and spectroscopic techniques (X-ray photoelectron spectroscopy). ZVI-SW could effectively and efficiently remove SeIV from solution with pH 6-8.5. A two-step removal mechanism was identified for SeIV reduction by ZVI-SW. The proposed mechanism was electrochemical reduction of SeIV by Fe0 in an initial lag stage, followed by a faster heterogeneous reduction, mediated by an FeII-bearing phase (hydroxide or green rust). Solution pH was a critical factor for the kinetic rate in the lag stage (0.33 h-1 for pH > 8 and 0.10 h-1 for pH 6-8). The length of lag stage was 20-30 min as determined by the time for dissolved FeII concentration to reach 0.30 ± 0.04 mg L-1 which was critical for induction of the faster stage. About 65% of the initial SeIV was reduced to Se0, the primary reductive product in both stages.
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Affiliation(s)
- Ziyan Li
- College of Natural Resources and Environment, Northwest Agriculture and Forestry University, 3# Taicheng Rd., Yangling, Shaanxi 712100, China and Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, China E-mail:
| | - Donglin Huang
- College of Natural Resources and Environment, Northwest Agriculture and Forestry University, 3# Taicheng Rd., Yangling, Shaanxi 712100, China and Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, China E-mail:
| | - Louis M McDonald
- Division of Plant and Soil Sciences, West Virginia University, P.O. Box 6108, Morgantown, WV 26506, USA
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Moore RC, Rigali MJ, Brady P. Selenite sorption by carbonate substituted apatite. Environ Pollut 2016; 218:1102-1107. [PMID: 27592077 DOI: 10.1016/j.envpol.2016.08.063] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 08/08/2016] [Accepted: 08/24/2016] [Indexed: 06/06/2023]
Abstract
The sorption of selenite, SeO32-, by carbonate substituted hydroxylapatite was investigated using batch kinetic and equilibrium experiments. The carbonate substituted hydroxylapatite was prepared by a precipitation method and characterized by SEM, XRD, FT-IR, TGA, BET and solubility measurements. The material is poorly crystalline, contains approximately 9.4% carbonate by weight and has a surface area of 210.2 m2/g. Uptake of selenite by the carbonated hydroxylapatite was approximately an order of magnitude higher than the uptake by uncarbonated hydroxylapatite reported in the literature. Distribution coefficients, Kd, determined for the carbonated apatite in this work ranged from approximately 4200 to over 14,000 L/kg. A comparison of the results from kinetic experiments performed in this work and literature kinetic data indicates the carbonated apatite synthesized in this study sorbed selenite 23 times faster than uncarbonated hydroxylapatite based on values normalized to the surface area of each material. The results indicate carbonated apatite is a potential candidate for use as a sorbent for pump-and-treat technologies, soil amendments or for use in permeable reactive barriers for the remediation of selenium contaminated sediments and groundwaters.
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Affiliation(s)
- Robert C Moore
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185, United States.
| | - Mark J Rigali
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185, United States.
| | - Patrick Brady
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185, United States.
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Kora AJ, Rastogi L. Biomimetic synthesis of selenium nanoparticles by Pseudomonas aeruginosa ATCC 27853: An approach for conversion of selenite. J Environ Manage 2016; 181:231-236. [PMID: 27353373 DOI: 10.1016/j.jenvman.2016.06.029] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 06/20/2016] [Accepted: 06/20/2016] [Indexed: 06/06/2023]
Abstract
A facile and green method for the reduction of selenite was developed using a Gram-negative bacterial strain Pseudomonas aeruginosa, under aerobic conditions. During the process of bacterial conversion, the elemental selenium nanoparticles were produced. These nanoparticles were systematically characterized using various analytical techniques including UV-visible spectroscopy, XRD, Raman spectroscopy, SEM, DLS, TEM and FTIR spectroscopy techniques. The generation of selenium nanoparticles was confirmed from the appearance of red colour in the culture broth and broad absorption peaks in the UV-vis. The synthesized nanoparticles were spherical, polydisperse, ranged from 47 to 165 nm and the average particle size was about 95.9 nm. The selected-area electron diffraction, XRD patterns; and Raman spectroscopy established the amorphous nature of the fabricated nanoparticles. The IR data demonstrated the bacterial protein mediated selenite reduction and capping of the produced nanoparticles. The selenium removal was assessed at different selenite concentrations using ICP-OES and the results showed that the tested bacterial strain exhibited significant selenite reduction activity. The results demonstrate the possible application of P. aeruginosa for bioremediation of waters polluted with toxic and soluble selenite. Moreover, the potential metal reduction capability of the bacterial strain can function as green method for aerobic generation of selenium nanospheres.
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Affiliation(s)
- Aruna Jyothi Kora
- National Centre for Compositional Characterisation of Materials (NCCCM), Bhabha Atomic Research Centre (BARC), ECIL PO, Hyderabad, 500 062, India.
| | - Lori Rastogi
- National Centre for Compositional Characterisation of Materials (NCCCM), Bhabha Atomic Research Centre (BARC), ECIL PO, Hyderabad, 500 062, India.
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Finck N, Dardenne K. Interaction of selenite with reduced Fe and/or S species: An XRD and XAS study. J Contam Hydrol 2016; 188:44-51. [PMID: 27010738 DOI: 10.1016/j.jconhyd.2016.03.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 02/23/2016] [Accepted: 03/08/2016] [Indexed: 06/05/2023]
Abstract
In this study, we investigated the interaction between selenite and either Fe((II))aq or S((-II))aq in solution, and the results were used to investigate the interaction between Se((IV))aq and FeS in suspension. The reaction products were characterized by a combination of methods (SEM, XRD and XAS) and the reaction mechanisms were identified. In a first experiment, Se((IV))aq was reduced to Se((0)) by interaction with Fe((II))aq which was oxidized to Fe((III)), but the reaction was only partial. Subsequently, some Fe((III)) produced akaganeite (β-FeOOH) and the release of proton during that reaction decreased the pH. The pH decrease changed the Se speciation in solution which hindered further Se((IV)) reduction by Fe((II))aq. In a second experiment, Se((IV))aq was quantitatively reduced to Se((0)) by S((-II))aq and the reaction was fast. Two sulfide species were needed to reduce one Se((IV)), and the observed pH increase was due to a proton consumption. For both experiments, experimental results are consistent with expectations based on the oxidation reduction potential of the various species. Upon interaction with FeS, Se((IV))aq was reduced to Se((0)) and minute amounts of pyrite were detected, a consequence of partial mackinawite oxidation at surface sulfur sites. These results are of prime importance with respect to safe deep disposal of nuclear waste which contains the long-lived radionuclide (79)Se. This study shows that after release of (79)Se((IV)) upon nuclear waste matrix corrosion, selenite can be reduced in the near field to low soluble Se((0)) by interaction with Fe((II))aq and/or S((-II))aq species. Because the solubility of Se((0)) species is significantly lower than that of Se((IV)), selenium will become much less (bio)available and its migration out of deep HLW repositories may be drastically hindered.
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Affiliation(s)
- Nicolas Finck
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, D-76021 Karlsruhe, Germany.
| | - Kathy Dardenne
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, D-76021 Karlsruhe, Germany
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Jain R, Matassa S, Singh S, van Hullebusch ED, Esposito G, Lens PNL. Reduction of selenite to elemental selenium nanoparticles by activated sludge. Environ Sci Pollut Res Int 2016; 23:1193-1202. [PMID: 26351196 DOI: 10.1007/s11356-015-5138-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 07/30/2015] [Indexed: 06/05/2023]
Abstract
Total selenium removal by the activated sludge process, where selenite is reduced to colloidal elemental selenium nanoparticles (BioSeNPs) that remain entrapped in the activated sludge flocs, was studied. Total selenium removal efficiencies with glucose as electron donor (2.0 g chemical oxygen demand (COD) L(-1)) at neutral pH and 30 °C gave 2.9 and 6.8 times higher removal efficiencies as compared to the electron donors lactate and acetate, respectively. Total selenium removal efficiencies of 79 (±3) and 86 (±1) % were achieved in shake flasks and fed batch reactors, respectively, at dissolved oxygen (DO) concentrations above 4.0 mg L(-1) and 30 °C when fed with 172 mg L(-1) (1 mM) Na2SeO3 and 2.0 g L(-1) COD of glucose. Continuously operated reactors operating at neutral pH, 30 °C and a DO >3 mg L(-1) removed 33.98 and 36.65 mg of total selenium per gram of total suspended solids (TSS) at TSS concentrations of 1.3 and 3.0 g L(-1), respectively. However, selenite toxicity to the activated sludge led to failure of a continuously operating activated sludge reactor at the applied loading rates. This suggests that a higher hydraulic retention time (HRT) or different reactor configurations need to be applied for selenium-removing activated sludge processes. Graphical Abstract Scheme representing the possible mechanisms of selenite reduction at high and low DO levels in the activated sludge process.
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Affiliation(s)
- Rohan Jain
- UNESCO-IHE, Institute for Water Education, Westvest 7, 2611AX, Delft, The Netherlands.
- Laboratoire Géomatériaux et Environnement (EA 4508), Université Paris-Est, UPEM, 77454, Marne la Vallée, France.
| | - Silvio Matassa
- UNESCO-IHE, Institute for Water Education, Westvest 7, 2611AX, Delft, The Netherlands
- Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via Di Biasio 43, 03043, Cassino, FR, Italy
| | - Satyendra Singh
- Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology, Delhi, Hauz-Khas, New Delhi, 110016, India
| | - Eric D van Hullebusch
- Laboratoire Géomatériaux et Environnement (EA 4508), Université Paris-Est, UPEM, 77454, Marne la Vallée, France
| | - Giovanni Esposito
- Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via Di Biasio 43, 03043, Cassino, FR, Italy
| | - Piet N L Lens
- UNESCO-IHE, Institute for Water Education, Westvest 7, 2611AX, Delft, The Netherlands
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Yamani JS, Lounsbury AW, Zimmerman JB. Towards a selective adsorbent for arsenate and selenite in the presence of phosphate: Assessment of adsorption efficiency, mechanism, and binary separation factors of the chitosan-copper complex. Water Res 2016; 88:889-896. [PMID: 26613182 DOI: 10.1016/j.watres.2015.11.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 11/05/2015] [Accepted: 11/06/2015] [Indexed: 06/05/2023]
Abstract
The potential for a chitosan-copper polymer complex to select for the target contaminants in the presence of their respective competitive ions was evaluated by synthesizing chitosan-copper beads (CCB) for the treatment of (arsenate:phosphate), (selenite:phosphate), and (selenate:sulfate). Based on work by Rhazi et al., copper (II) binds to the amine moiety on the chitosan backbone as a monodentate complex (Type I) and as a bidentate complex crosslinking two polymer chains (Type II), depending on pH and copper loading. In general, the Type I complex exists alone; however, beyond threshold conditions of pH 5.5 during synthesis and a copper loading of 0.25 mol Cu(II)/mol chitosan monomer, the Type I and Type II complexes coexist. Subsequent chelation of this chitosan-copper ligand to oxyanions results in enhanced and selective adsorption of the target contaminants in complex matrices with high background ion concentrations. With differing affinities for arsenate, selenite, and phosphate, the Type I complex favors phosphate chelation while the Type II complex favors arsenate chelation due to electrostatic considerations and selenite chelation due to steric effects. No trend was exhibited for the selenate:sulfate system possibly due to the high Ksp of the corresponding copper salts. Binary separation factors, α12, were calculated for the arsenate-phosphate and selenite-phosphate systems, supporting the mechanistic hypothesis. While, further research is needed to develop a synthesis method for the independent formation of the Type II complexes to select for target contaminants in complex matrices, this work can provide initial steps in the development of a selective adsorbent.
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Affiliation(s)
- Jamila S Yamani
- Yale University, Department of Chemical and Environmental Engineering, 9 Hillhouse Ave, Mason Lab 301, New Haven, CT 06511, United States
| | - Amanda W Lounsbury
- Yale University, Department of Chemical and Environmental Engineering, 9 Hillhouse Ave, Mason Lab 301, New Haven, CT 06511, United States
| | - Julie B Zimmerman
- Yale University, Department of Chemical and Environmental Engineering, 9 Hillhouse Ave, Mason Lab 301, New Haven, CT 06511, United States; Yale University, School of Forestry and Environmental Studies, 195 Prospect St., New Haven, CT 06511, United States.
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Li J, Qin H, Guan X. Premagnetization for Enhancing the Reactivity of Multiple Zerovalent Iron Samples toward Various Contaminants. Environ Sci Technol 2015; 49:14401-14408. [PMID: 26575344 DOI: 10.1021/acs.est.5b04215] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Premagnetization was applied to enhance the removal of various oxidative contaminants (including amaranth (AR27), lead ion (Pb(2+)), cupric ion (Cu(2+)), selenite (Se(4+)), silver ion (Ag(+)), and chromate (Cr(6+))) by zerovalent iron (ZVI) from different origins under well-controlled experimental conditions. The rate constants of contaminants by premagnetized ZVI (Mag-ZVI) samples were 1.2-12.2-fold greater than those by pristine ZVI (Pri-ZVI) samples. Generally, there was a linear correlation between the specific reaction rate constants (kSA) of one particular contaminant removal by various Pri-ZVI or Mag-ZVI samples and those of the other contaminant, which could be successfully employed to predict the kSA of one contaminant by one ZVI sample if kSA of the other contaminant by this ZVI sample was available. The specific rate constant of Fe(II) release at pH 4.0 was proposed in this study to stand for the intrinsic reactivity of a ZVI sample. All Mag-ZVI samples had higher intrinsic reactivity than their counterparts without premagnetization. There were strong correlations between the intrinsic reactivity of various Pri-ZVI/Mag-ZVI samples and the removal rate constants of a specific contaminant by these ZVI samples not only at pH 4.0 when the intrinsic reactivity was determined but also at other pH levels. This correlation could be employed to predict the removal rate constant of this contaminant by a ZVI sample that was not included in the original data set once the intrinsic reactivity of the ZVI sample was known.
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Affiliation(s)
- Jinxiang Li
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University , Shanghai 200092, People's Republic of China
| | - Hejie Qin
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University , Shanghai 200092, People's Republic of China
| | - Xiaohong Guan
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University , Shanghai 200092, People's Republic of China
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Liao JH, Wu TH, Chen MY, Chen WT, Lu SY, Wang YH, Wang SP, Hsu YM, Huang YS, Huang ZY, Lin YC, Chang CM, Huang FY, Wu SH. The Comparative Studies of Binding Activity of Curcumin and Didemethylated Curcumin with Selenite: Hydrogen Bonding vs Acid-Base Interactions. Sci Rep 2015; 5:17614. [PMID: 26635113 PMCID: PMC4669449 DOI: 10.1038/srep17614] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 11/02/2015] [Indexed: 01/07/2023] Open
Abstract
In this report, the in vitro relative capabilities of curcumin (CCM) and didemethylated curcumin (DCCM) in preventing the selenite-induced crystallin aggregation were investigated by turbidity tests and isothermal titration calorimetry (ITC). DCCM showed better activity than CCM. The conformers of CCM/SeO3(2-) and DCCM/SeO3(2-) complexes were optimized by molecular orbital calculations. Results reveal that the selenite anion surrounded by CCM through the H-bonding between CCM and selenite, which is also observed via IR and NMR studied. For DCCM, the primary driving force is the formation of an acid-base adduct with selenite showing that the phenolic OH group of DCCM was responsible for forming major conformer of DCCM. The formation mechanisms of selenite complexes with CCM or DCCM explain why DCCM has greater activity than CCM in extenuating the toxicity of selenite as to prevent selenite-induced lens protein aggregation.
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Affiliation(s)
- Jiahn-Haur Liao
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan
| | - Tzu-Hua Wu
- Department of Clinical Pharmacy, School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei 110, Taiwan
| | - Ming-Yi Chen
- General Education Center, National Taipei University of Nursing and Health Sciences, Taipei, Taiwan
| | - Wei-Ting Chen
- Department of Chemistry, National Cheng Kung University, Tainan 701 Taiwan
| | - Shou-Yun Lu
- Department of Chemistry, National Cheng Kung University, Tainan 701 Taiwan
| | - Yi-Hsuan Wang
- Department of Chemistry, National Cheng Kung University, Tainan 701 Taiwan
| | - Shao-Pin Wang
- Department of Chemistry, National Cheng Kung University, Tainan 701 Taiwan
| | - Yen-Min Hsu
- Institute of Biochemical Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - Yi-Shiang Huang
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan
- Department of Clinical Pharmacy, School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei 110, Taiwan
| | - Zih-You Huang
- Institute of Biochemical Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - Yu-Ching Lin
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan
| | - Ching-Ming Chang
- Institute of Biochemical Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - Fu-Yung Huang
- Department of Chemistry, National Cheng Kung University, Tainan 701 Taiwan
| | - Shih-Hsiung Wu
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan
- Institute of Biochemical Sciences, National Taiwan University, Taipei 10617, Taiwan
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Liu XW, Wang QL, Duan BH, Lin YM, Zhao XH, Hu CX, Zhao ZQ. [Effects of selenite addition on selenium absorption, root morphology and physiological characteristics of rape seedlings]. Ying Yong Sheng Tai Xue Bao 2015; 26:2050-2056. [PMID: 26710631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Abstract: The rape (Brassica napus L. cv. Xiangnongyou 571) was chosen as the experimental material to undergo solution cultivation at seedling stage to investigate the effects of selenite addition on the selenium (Se) absorption and distribution, root morphology and physiological characteristics of rape seedlings. The results showed that the bioaccumulation ability of Se decreased significantly with increasing the Se application rate, but the Se distribution coefficient remained around 0.9 with no significant influence. The application of 10 µmol . L-1 selenite stimulated the growth of rape seedlings through improving the root physiological characteristics and root morphology significantly, including significantly increasing the production of superoxide radical (O2∙-) rate and the activities of superoxide dismutase (SOD), peroxidase (POD) and fungal catalase (CAT) in the root system, which resulted in a reduction of the lipids peroxidation (MDA) content as much as 26.0%, consequently increasing the root activity as much as 17.4%. The promoting degrees of selenite on root morphological parameters were from strong to weak in such a tendency: root volume > total surface area > number of root forks > total root length > number of root tips > average diameter. However, such positive effects had no significant difference with those in treatment with 1 µmol . L-1 selenite, indicating that small amounts (≤ 10 Lmol . L-1) of selenite were able to increase the activity of antioxidant enzymes and reduce the content of MDA in root system, which could increase root activity and improve root morphology, hence increased the biomass of rape seedlings.
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Okamura Y, Kagawa F, Seki S, Kubota M, Kawasaki M, Tokura Y. Microwave Magnetochiral Dichroism in the Chiral-Lattice Magnet Cu_{2}OSeO_{3}. Phys Rev Lett 2015; 114:197202. [PMID: 26024193 DOI: 10.1103/physrevlett.114.197202] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Indexed: 06/04/2023]
Abstract
Through broadband microwave spectroscopy in Faraday geometry, we observe distinct absorption spectra accompanying magnetoelectric (ME) resonance for oppositely propagating microwaves, i.e., directional dichroism, in the multiferroic chiral-lattice magnet Cu_{2}OSeO_{3}. The magnitude of the directional dichroism critically depends on the magnetic-field direction. Such behavior is well accounted for by considering the relative direction of the oscillating electric polarizations induced via the ME effect with respect to microwave electric fields. Directional dichroism in a system with an arbitrary form of ME coupling can be also discussed in the same manner.
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Affiliation(s)
- Y Okamura
- Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan
| | - F Kagawa
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - S Seki
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- PRESTO, Japan Science and Technology Agency, Bunkyo, Tokyo 113-8656, Japan
| | - M Kubota
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Research and Development Headquarters, ROHM Co., Ltd., Kyoto 615-8585, Japan
| | - M Kawasaki
- Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - Y Tokura
- Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
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Xie W, Liang Q, Qian T, Zhao D. Immobilization of selenite in soil and groundwater using stabilized Fe-Mn binary oxide nanoparticles. Water Res 2015; 70:485-494. [PMID: 25577492 DOI: 10.1016/j.watres.2014.12.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 12/13/2014] [Accepted: 12/16/2014] [Indexed: 06/04/2023]
Abstract
Stabilized Fe-Mn binary oxide nanoparticles were synthesized and tested for removal and in-situ immobilization of Se(IV) in groundwater and soil. A water-soluble starch or food-grade carboxymethyl cellulose (CMC) was used as a stabilizer to facilitate in-situ delivery of the particles into contaminated soil. While bare and stabilized nanoparticles showed rapid sorption kinetics, starch-stabilized Fe-Mn offered the greatest capacity for Se(IV). The Langmuir maximum capacity was determined to be 109 and 95 mg-Se/g-Fe for starch- and CMC-stabilized nanoparticles, respectively, and the high Se(IV) uptake was observed over the typical groundwater pH range of 5-8. Column breakthrough tests indicated that the stabilized nanoparticles were deliverable in a model sandy soil while non-stabilized particles were not. When a Se(IV)-spiked soil was treated in situ with the nanoparticles, >90% water leachable Se(IV) was transferred to the nanoparticle phase, and thereby immobilized as the particles were retained in the downstream soil matrix. The nanoparticle amendment reduced the TCLP (toxicity characteristic leaching procedure) leachability and the California WET (waste extraction test) leachability of Se(IV) by 76% and 71%, respectively. The technology holds the potential to fill a major technology gap in remediation of metals-contaminated soil and groundwater.
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Affiliation(s)
- Wenbo Xie
- Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn, AL 36849, USA; College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, PR China
| | - Qiqi Liang
- Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn, AL 36849, USA
| | - Tianwei Qian
- Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn, AL 36849, USA; Institute of Environmental Science, Taiyuan University of Science and Technology, Taiyuan, Shanxi 030024, PR China
| | - Dongye Zhao
- Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn, AL 36849, USA; Institute of Environmental Science, Taiyuan University of Science and Technology, Taiyuan, Shanxi 030024, PR China.
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Tang C, Huang YH, Zeng H, Zhang Z. Reductive removal of selenate by zero-valent iron: The roles of aqueous Fe(2+) and corrosion products, and selenate removal mechanisms. Water Res 2014; 67:166-174. [PMID: 25269108 DOI: 10.1016/j.watres.2014.09.016] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 09/09/2014] [Accepted: 09/11/2014] [Indexed: 06/03/2023]
Abstract
Batch tests were conducted to investigate the roles of dissolved Fe(2+) and corrosion products, and the involved mechanisms in selenate (Se(VI)) removal by zero-valent iron (ZVI). The results showed that insignificant Se(VI) removal (4-7.5%) was observed in the presence of ZVI or Fe(2+) alone. However, external supply of dissolved ferrous ion dramatically enhanced Se(VI) removal in the presence of ZVI. Selenate removal efficiency increased with increasing Fe(2+) concentration. Selenate removal sustained only if Fe(2+) was supplied continuously. Both sequential extraction experiments and XPS analysis showed that selenate was reduced step by step, with elemental selenium and adsorbed selenite as the dominant reductive products. Selenite and elemental selenium could be further reduced to selenide, with continuous Fe(2+) supply and sufficient reaction time. In the ZVI-Se(VI)-Fe(2+) system, ZVI was the major electron donor for selenate reduction. Fe(2+) functioned as electron donor as well and was consumed with a Fe(2+):Se stoichiometry of ∼1:1. It also facilitated the transformation of the passive layer of iron coatings to a medium (e.g., magnetite) favoring electron transfer and thus enhanced selenate reduction. Iron corrosion products were media for electron transfer and reactive interfaces for selenium adsorption and reduction. These findings provided a new approach to overcome ZVI surface passivation for long-term application.
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Affiliation(s)
- Cilai Tang
- Department of Environmental Engineering, College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, China; Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77843, USA.
| | - Yong H Huang
- Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Hui Zeng
- Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Zengqiang Zhang
- College of Resources and Environment, Northwest A&F University of China, Yangling 712100, China
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Tugarova AV, Vetchinkina EP, Loshchinina EA, Burov AM, Nikitina VE, Kamnev AA. Reduction of selenite by Azospirillum brasilense with the formation of selenium nanoparticles. Microb Ecol 2014; 68:495-503. [PMID: 24863127 DOI: 10.1007/s00248-014-0429-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Accepted: 04/29/2014] [Indexed: 06/03/2023]
Abstract
The ability to reduce selenite (SeO(3)(2-)) ions with the formation of selenium nanoparticles was demonstrated in Azospirillum brasilense for the first time. The influence of selenite ions on the growth of A. brasilense Sp7 and Sp245, two widely studied wild-type strains, was investigated. Growth of cultures on both liquid and solid (2 % agar) media in the presence of SeO(3)(2-) was found to be accompanied by the appearance of the typical red colouration. By means of transmission electron microscopy (TEM), electron energy loss spectroscopy (EELS) and X-ray fluorescence analysis (XFA), intracellular accumulation of elementary selenium in the form of nanoparticles (50 to 400 nm in diameter) was demonstrated for both strains. The proposed mechanism of selenite-to-selenium (0) reduction could involve SeO(3)(2-) in the denitrification process, which has been well studied in azospirilla, rather than a selenite detoxification strategy. The results obtained point to the possibility of using Azospirillum strains as endophytic or rhizospheric bacteria to assist phytoremediation of, and cereal cultivation on, selenium-contaminated soils. The ability of A. brasilense to synthesise selenium nanoparticles may be of interest to nanobiotechnology for "green synthesis" of bioavailable amorphous red selenium nanostructures.
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Affiliation(s)
- Anna V Tugarova
- Laboratory of Biochemistry, Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, 410049, Saratov, Russia,
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Liang L, Guan X, Shi Z, Li J, Wu Y, Tratnyek PG. Coupled effects of aging and weak magnetic fields on sequestration of selenite by zero-valent iron. Environ Sci Technol 2014; 48:6326-6334. [PMID: 24804570 DOI: 10.1021/es500958b] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The sequestration of Se(IV) by zero-valent iron (ZVI) is strongly influenced by the coupled effects of aging ZVI and the presence of a weak magnetic field (WMF). ZVI aged at pH 6.0 with MES as buffer between 6 and 60 h gave nearly constant rates of Se(IV) removal with WMF but with rate constants that are 10- to 100-fold greater than without. XANES analysis showed that applying WMF changes the mechanism of Se(IV) removal by ZVI aged for 6-60 h from adsorption followed by reduction to direct reduction. The strong correlation between Se(IV) removal and Fe2+ release suggests direct reduction of Se(IV) to Se(0) by Fe0, in agreement with the XANES analysis. The numerical simulation of ZVI magnetization revealed that the WMF influence on Se(IV) sequestration is associated mainly with the ferromagnetism of ZVI and the paramagnetism of Fe2+. In the presence of the WMF, the Lorentz force gives rise to convection in the solution, which narrows the diffusion layer, and the field gradient force, which tends to move paramagnetic ions (esp. Fe2+) along the higher field gradient at the ZVI particle surface, thereby inducing nonuniform depassivation and eventually localized corrosion of the ZVI surface.
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Affiliation(s)
- Liping Liang
- State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology , Harbin 150090, Heilongjiang, PR China
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Yang WJ, Guo YQ, Du ED. [Dynamic effects of commonly co-existing anions on the removal of selenite from groundwater by nanoscale zero-valent iron]. Huan Jing Ke Xue 2014; 35:1793-1797. [PMID: 25055668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Batch experiments are used to research selenite removal from groundwater by nanoscale zero-valent iron (nZVI) , and dynamic effects of commonly co-existing anions on the removal of selenite are also investigated. The results showed that under anoxic conditions,when nZVI dose was 0.1 g.L-1 , the concentration of Se( IV)/sodium chloride was 100 micromol.L-1/0. 01 mol L-1 , pH = 7.0, T = 25 degrees C +/- 1 degrees C, auto-adding 1 mmol.L -1 CO(2-)(3) or SO(2-)(4) , 5 mg. L -1 humic acid (HA), the removals of Se( IV ) were obviously inhibited. The weak effect on the removal of Se( IV) was observed when added 0. 5 mmol L- Ca2+ or Mg2 ,while concentrations of Ca2+ and Mg2+ were 3 mmol L-1 and 3 mmol L-1 respectively, removal efficiency of Se( IV) were evidently decreased. Without coexisting ions, Se( IV) were totally removed in 20 min, while with co-existing ions, removal efficiency of Se( NV) were achieved 100% in 30 min. Bivalent iron tended to stationary with the remove of Se( WV) in reaction processes. ORP rapidly decreased from positive to negative in the process of reaction, which illustrated the process of remove Se( IV) by nZVI was the reduction reaction.
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Li B, Liu N, Li Y, Jing W, Fan J, Li D, Zhang L, Zhang X, Zhang Z, Wang L. Reduction of selenite to red elemental selenium by Rhodopseudomonas palustris strain N. PLoS One 2014; 9:e95955. [PMID: 24759917 PMCID: PMC3997485 DOI: 10.1371/journal.pone.0095955] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 04/01/2014] [Indexed: 02/03/2023] Open
Abstract
The trace metal selenium is in demand for health supplements to human and animal nutrition. We studied the reduction of selenite (SeO₃⁻²) to red elemental selenium by Rhodopseudomonas palustris strain N. This strain was cultured in a medium containing SeO₃⁻² and the particles obtained from cultures were analyzed using transmission electron microscopy (TEM), energy dispersive microanalysis (EDX) and X ray diffraction analysis (XRD). Our results showed the strain N could reduce SeO₃⁻² to red elemental selenium. The diameters of particles were 80-200 nm. The bacteria exhibited significant tolerance to SeO₃⁻² up to 8.0 m mol/L concentration with an EC₅₀ value of 2.4 m mol/L. After 9 d of cultivation, the presence of SeO₃²⁻ up to 1.0 m mol/L resulted in 99.9% reduction of selenite, whereas 82.0% (p<0.05), 31.7% (p<0.05) and 2.4% (p<0.05) reduction of SeO₃⁻² was observed at 2.0, 4.0 and 8.0 m mol/L SeO₃²⁻ concentrations, respectively. This study indicated that red elemental selenium was synthesized by green technology using Rhodopseudomonas palustris strain N. This strain also indicated a high tolerance to SeO₃⁻². The finding of this work will contribute to the application of selenium to human health.
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Affiliation(s)
- Baozhen Li
- School of Life Science, Shanxi University, Taiyuan, China
| | - Na Liu
- School of Life Science, Shanxi University, Taiyuan, China
| | - Yongquan Li
- School of Life Science, Shanxi University, Taiyuan, China
| | - Weixin Jing
- School of Life Science, Shanxi University, Taiyuan, China
| | - Jinhua Fan
- School of Life Science, Shanxi University, Taiyuan, China
| | - Dan Li
- School of Life Science, Shanxi University, Taiyuan, China
| | - Longyan Zhang
- School of Life Science, Shanxi University, Taiyuan, China
| | | | - Zhaoming Zhang
- School of Life Science, Shanxi University, Taiyuan, China
| | - Lan Wang
- School of Life Science, Shanxi University, Taiyuan, China
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Liang L, Sun W, Guan X, Huang Y, Choi W, Bao H, Li L, Jiang Z. Weak magnetic field significantly enhances selenite removal kinetics by zero valent iron. Water Res 2014; 49:371-380. [PMID: 24199999 DOI: 10.1016/j.watres.2013.10.026] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 10/06/2013] [Accepted: 10/08/2013] [Indexed: 06/02/2023]
Abstract
The effect of weak magnetic field (WMF) on Se(IV) removal by zero valent iron (ZVI) was investigated as functions of pH and initial Se(IV) concentrations. The presence of WMF significantly accelerated Se(IV) removal and extended the working pH range of ZVI from 4.0-6.0 to 4.0-7.2. The WMF induced greater enhancement in Se(IV) removal by ZVI at lower initial Se(IV) concentrations. The influence of WMF on Se(IV) removal by ZVI was associated with a more dramatic drop in ORP and a more rapid release of Fe(2+) compared to the case without WMF. SEM and XRD analysis revealed that WMF accelerated the corrosion of ZVI and the transformation of amorphous iron (hdyr)oxides to lepidocrocite. XANES analyses showed that WMF expedited the reduction of Se(IV) to Se(0) by ZVI at pH 6.0 when its initial concentration was ≤20.0 mg L(-1). Se(IV) dosed at 40.0 mg L(-1) was removed by ZVI via adsorption followed by reduction to Se(0) at pH 7.0 but via adsorption at 7.2 in the presence of WMF. Regardless of WMF, Se(IV) applied at 40.0 mg L(-1) was removed by reduction at pH 4.0-6.0. The WMF-induced improvement in Se(IV) removal by ZVI may be mainly attributable to the Lorentz force and magnetic field gradient force. Employing WMF to enhance Se(IV) removal by ZVI is a promising and environmental-friendly method since it does not need extra energy and costly reagents.
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Affiliation(s)
- Liping Liang
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, PR China; State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, PR China
| | - Wu Sun
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, PR China
| | - Xiaohong Guan
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, PR China; State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, PR China.
| | - Yuying Huang
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, PR China
| | - Wonyong Choi
- School of Environmental Science & Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea
| | - Hongliang Bao
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, PR China
| | - Lina Li
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, PR China
| | - Zheng Jiang
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, PR China
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Baik MH, Lee SY, Jeong J. Sorption and reduction of selenite on chlorite surfaces in the presence of Fe(II) ions. J Environ Radioact 2013; 126:209-215. [PMID: 24056049 DOI: 10.1016/j.jenvrad.2013.08.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Revised: 07/10/2013] [Accepted: 08/13/2013] [Indexed: 06/02/2023]
Abstract
The sorption and reduction of selenite on chlorite surfaces in the presence of Fe(II) ions were investigated as a function of pH, Se(IV) concentration, and Fe(II) concentration under an anoxic condition. The sorption of Se(IV) onto chlorite surfaces followed the Langmuir isotherm regardless of the presence of Fe(II) ions in the solution. The Se(IV) sorption was observed to be very low at all pH values when the solution was Fe(II)-free or the concentration of Fe(II) ions was as low as 0.5 mg/L. However, the Se(IV) sorption was enhanced at a pH > 6.5 when the Fe(II) concentration was higher than 5 mg/L because of the increased sorption of Fe(II) onto the chlorite surfaces. XANES (X-ray absorption near edge structure) spectra of the Se K-edge showed that most of the sorbed Se(IV) was reduced to Se(0) by Fe(II) sorbed onto the chlorite surfaces, especially at pH > 9. The combined results of field-emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) also showed that elemental selenium and goethite were formed and precipitated on the chlorite surfaces during the sorption of selenite. Consequently it can be concluded that Se(IV) can be reduced to Se(0) in the presence of Fe(II) ions by the surface catalytic oxidation of Fe(II) into Fe(III) and the formation of goethite at neutral and particularly alkaline conditions. Thus the mobility of selenite in groundwater is expected to be reduced by the presence of a relatively higher concentration of Fe(II) in subsurface environments.
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Affiliation(s)
- Min Hoon Baik
- Korea Atomic Energy Research Institute, Daedeokdaero 989-111, Yuseong-gu, Daejeon 305-353, Republic of Korea.
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Liang L, Yang W, Guan X, Li J, Xu Z, Wu J, Huang Y, Zhang X. Kinetics and mechanisms of pH-dependent selenite removal by zero valent iron. Water Res 2013; 47:5846-5855. [PMID: 23899877 DOI: 10.1016/j.watres.2013.07.011] [Citation(s) in RCA: 112] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2013] [Revised: 06/29/2013] [Accepted: 07/06/2013] [Indexed: 06/02/2023]
Abstract
The kinetics of Se(IV) removal by zero valent iron (ZVI) open to the air as a function of pH and the involved mechanisms were investigated in this study. The specific rate constants of Se(IV) removal by ZVI decreased from 92.87 to 6.87 L h(-1) m(-2) as pH increased from 4.0 to 7.0. The positive correlation between the removal rate of Se(IV) and the generation rate of Fe(II) and the depression of Se(IV) removal in the presence of 1,10-phenanthroline indicated that both ZVI and adsorbed Fe(II) on ZVI surface contributed to the reductive removal of Se(IV). The soft X-ray STXM measurement confirmed the adsorption of Fe(II) on the surface of ZVI and freshly formed ferric (hydr)oxides. Se(IV) was removed by adsorption followed by reduction to Se(0) on ZVI surface at pH 4.0-7.0, as revealed by XANES spectra. A core-shell structure was observed when ZVI reacted with Se(IV)-containing solution for 3 h at pH 6.0. Se(IV) was reduced to Se(0) and co-precipitated with the freshly formed Fe(III), forming the shell surrounding the iron core. After reaction for 24 h, the generated Se(0) was surrounded by multiple layers of Fe(III) oxides/hydroxides. SEM images and XRD patterns revealed that the corrosion products of ZVI at pH 6.0 transformed from amorphous iron hydroxides to lepidocrocite (γ-FeOOH) as reaction proceeded. The final corrosion products of ZVI contained both lepidocrocite and goethite at pH 5.0 while they were X-ray amorphous at pH 4.0 and 7.0.
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Affiliation(s)
- Liping Liang
- State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, PR China
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Akiho H, Ito S, Matsuda H, Yoshioka T. Elucidation of the mechanism of reaction between S2O8(2-), Selenite and Mn2+ in aqueous solution and limestone-gypsum FGD liquor. Environ Sci Technol 2013; 47:11311-11317. [PMID: 24015970 DOI: 10.1021/es3042302] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The mechanism of reaction between peroxodisulfate ion (S2O8(2-)), selenite (Se(IV)O3(2-)) and Mn(2+) as an inhibitor of selenite oxidation was studied using aqueous solutions composed of commercial reagents, as well as limestone-gypsum flue gas desulfurization (FGD) liquors sampled from coal fired power plants. The oxidation of selenite to selenate (Se(VI)O4(2-)) is promoted by the sulfate ion radical (SO4(-)) which results from decomposition of S2O8(2-). In the presence of Mn(2+), selenite oxidation was prevented due to the difference in rates of reaction with SO4(-). The ratio of the oxidation rate constants of selenite and Mn(2+) with SO4(-) was determined over a temperature range of 40-60 °C, and was found to be little influenced by the various coexisting components in FGD liquors.
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Affiliation(s)
- Hiroyuki Akiho
- Energy Engineering Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI) , 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan
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Zhao J, Zhao H, Wang X, Huang R, Enomoto H, He Z, Li CP. Characteristics and enhanced antioxidant activity of egg white protein selenized by dry-heating in the presence of selenite. J Agric Food Chem 2013; 61:3131-3139. [PMID: 23458398 DOI: 10.1021/jf305166z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This study reports a new method for the selenization of food proteins. Egg white protein (EWP) was selenized by dry-heating in the presence of selenite, and the physiochemical and functional properties of the selenized EWP were investigated. Selenization was accelerated with a decrease in pH from 7.0 to 3.0, an increase in heating time from 1 to 5 days, and an increase in incubation temperatures from 25 to 80 °C. The electrophoretic mobility of EWP increased with an increase in the level of selenization. Heat-induced polymerization of EWP was promoted by dry-heating in the presence of selenite. The selenite group was acid-stable and base-labile, which suggests that it was bound to the hydroxyl group of an amino acid and formed an -O-SeHO2 linkage. (77)Se NMR spectral data also suggested that the selenite bond (-O-SeHO2) was bound to EWP. The digestibility of EWP was improved by selenization. The antioxidant activities of EWP, including ABTS(+) free radical scavenging capacity, hydroxyl radical scavenging capacity, reducing power, and the Fe(2+) chelating capacity, were remarkably enhanced by selenization. This finding is the first to describe that EWP can be selenized by dry-heating in the presence of selenite and that the antioxidant activities of EWP are markedly enhanced by selenization. This points to a potentially new method for generating antioxidant food protein and a new method for preparing organic Se.
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Affiliation(s)
- Jinping Zhao
- School of Chemical Science and Technology, Yunnan University , Kunming 650091, People's Republic of China
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Arjunan V, Marchewka MK, Kalaivani M. Synthesis, vibrational and quantum chemical investigations of hydrogen bonded complex betaine dihydrogen selenite. Spectrochim Acta A Mol Biomol Spectrosc 2012; 96:744-758. [PMID: 22885089 DOI: 10.1016/j.saa.2012.07.054] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Revised: 07/03/2012] [Accepted: 07/11/2012] [Indexed: 06/01/2023]
Abstract
The molecular complex of betaine with selenious acid namely, betaine dihydrogen selenite (C(5)H(13)NO(5)Se, BDHSe) was synthesised by the reaction of betaine and SeO(2) in a 1:1:1 solution of isopropanol, methanol and water. Crystals were grown from this solution by cooling to 253 K for few days. The complex was formed without accompanying proton transfer from selenious acid molecule to betaine. The complete vibrational assignments and analysis of BDHSe have been performed by FTIR, FT-Raman and far-infrared spectral studies. More support on the experimental findings was added from the quantum chemical studies performed with DFT (B3LYP) method using 6-311++G(**), 6-31G(**), cc-pVDZ and 3-21G basis sets. The structural parameters, energies, thermodynamic parameters and the NBO charges of BDHSe were determined by the DFT method. The (1)H and (13)C isotropic chemical shifts (δ ppm) of BDHSe with respect to TMS were also calculated using the gauge independent atomic orbital (GIAO) method and compared with the experimental data. SHG experiment was carried out using Kurtz-Perry powder technique. The efficiency of second harmonic generation for BDHSe was estimated relatively to KDP: d(eff)=0.97 d(eff) (KDP).
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Affiliation(s)
- V Arjunan
- Department of Chemistry, Kanchi Mamunivar Centre for Post-Graduate Studies, Puducherry 605008, India.
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Zhang SY, Liu Y, Ma X, Chen HY. Rapid, Large-Scale Synthesis and Electrochemical Behavior of Faceted Single-Crystalline Selenium Nanotubes. J Phys Chem B 2006; 110:9041-7. [PMID: 16671713 DOI: 10.1021/jp056718o] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This article describes a rapid, solution-phase approach to the large-scale synthesis of faceted single-crystalline Se nanotubes, in the presence of cetyltrimethylammonium bromide. The products were characterized by scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, laser Raman spectrography, differential scanning calorimetry analysis, and thermogravimetric analysis. The growth mechanism of the Se nanotubes was investigated by a series of experiments, and the rationality of the faceted morphology model for the Se nanotubes was demonstrated from the energetics and geometry. Furthermore, the electrochemical behavior of the Se nanotubes was studied by voltammetric techniques.
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Affiliation(s)
- Sheng-Yi Zhang
- Key Laboratory of Analytical Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
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Back TG, Kuzma D, Parvez M. Aromatic Derivatives and Tellurium Analogues of Cyclic Seleninate Esters and Spirodioxyselenuranes That Act as Glutathione Peroxidase Mimetics. J Org Chem 2005; 70:9230-6. [PMID: 16268595 DOI: 10.1021/jo0512711] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[Reaction: see text]. Several novel organoselenium and tellurium compounds were prepared and evaluated as mimetics of the selenoenzyme glutathione peroxidase, which protects cells from oxidative stress by reducing harmful peroxides with the thiol glutathione. The compounds were tested for catalytic activity in a model system wherein tert-butyl hydroperoxide or hydrogen peroxide were reduced with benzyl thiol and the rate of the reaction was measured by monitoring the formation of dibenzyl disulfide. Thus, aromatic derivatives 19, 22, 24, and 25 proved to be inferior catalysts compared to the parent cyclic seleninate ester 14 and spirodioxyselenurane 16. In the case of 19 and 22, this was the result of their rapid conversion to the relatively inert selenenyl sulfides 31 and 32, respectively. In general, hydrogen peroxide was reduced faster than tert-butyl hydroperoxide in the presence of the selenium-based catalysts. The cyclic tellurinate ester 27 and spirodioxytellurane 29 proved to be superior catalysts to their selenium analogues 14 and 16, respectively, resulting in the fastest reaction rates by far of all of the compounds we have investigated to date. Oxidation of 29 with hydrogen peroxide produced the unusual and unexpected peroxide 33, in which two hypervalent octahedral tellurium moieties are joined by ether and peroxide bridges. The structure of 33 was confirmed by X-ray crystallography. Although 33 displayed strong catalytic activity when tested independently in the model system, its relatively slow formation from the oxidation of 29 rules out its intermediacy in the catalytic cycle of 29.
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Affiliation(s)
- Thomas G Back
- Department of Chemistry, University of Calgary, Calgary, Alberta, Canada, T2N 1N4.
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Nath S, Ghosh SK, Panigrahi S, Pal T. Photo-induced decolorization of dimethylmethylene blue with selenious acid: a novel method to examine selective monomer-dimer distribution of the dye in micelle. Spectrochim Acta A Mol Biomol Spectrosc 2005; 61:2145-51. [PMID: 15911404 DOI: 10.1016/j.saa.2004.08.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2004] [Accepted: 08/19/2004] [Indexed: 05/02/2023]
Abstract
In this report, selenious acid (H2SeO3) has been exploited to study the decolorization of a cationic dye, dimethylmethylene blue (DMMB) with UV-light. Micelles have effectively been employed as organized media to promote the rate of decolorization of the dye molecules. Micellar catalysis has been explained as a consequence of electrostatic, hydrophobic and charge transfer interactions. It has also been shown that strong charge transfer and electrostatic interaction lead to an appreciable enhancement of the reaction rate in micelle, whereas, weak hydrophobic interaction is of marginal importance. Existence of monomer-dimer equilibrium for the dye molecules under certain selective environments has been identified spectrophotometrically. Then the shift of dimer-monomer equilibrium of the dye has been successfully studied in aqueous and micellar environments exploiting photodecolorization process for the dye in solution. 'Salting-in' and 'salting-out' agents were introduced into the reaction mixture to examine the viability of the dye decolorization process for dye contaminated water samples.
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Affiliation(s)
- Sudip Nath
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
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