1
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Al-Anber MA, Al Ja’afreh M, Al-Momani IF, Hijazi AK, Sobola D, Sagadevan S, Al Bayaydah S. Loading of Silver (I) Ion in L-Cysteine-Functionalized Silica Gel Material for Aquatic Purification. Gels 2023; 9:865. [PMID: 37998955 PMCID: PMC10670454 DOI: 10.3390/gels9110865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 10/21/2023] [Accepted: 10/24/2023] [Indexed: 11/25/2023] Open
Abstract
The L-cysteine-functionalized silica (SG-Cys-Na+) matrix was effectively loaded with silver (I) ions using the batch sorption technique. Optimal Ag(I) loading into SG-Cys-Na+ reached 98% at pHi = 6, 80 rpm, 1 mg L-1, and a temperature of 55 °C. The Langmuir isotherm was found to be suitable for Ag(I) binding onto SG-Cys-Na+ active sites, forming a homogeneous monolayer (R2 = 0.999), as confirmed by FTIR spectroscopy. XRD analysis indicated matrix stability and the absence of Ag2O and Ag(0) phases, observed from diffraction peaks. The pseudo-second-order model (R2 > 0.999) suggested chemisorption-controlled adsorption, involving chemical bonding between silver ions and SG-Cys-Na+ surface. Thermodynamic parameters were calculated, indicating higher initial concentrations leading to increased equilibrium constants, negative ΔG values, positive ΔS values, and negative ΔH. This study aimed to explore silver ion saturation on silica surfaces and the underlying association mechanisms. The capability to capture and load silver (I) ions onto functionalized silica gel materials holds promise for environmental and water purification applications.
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Affiliation(s)
- Mohammed A. Al-Anber
- Laboratory of Inorganic Materials and Polymers, Department of Chemistry, Faculty of Sciences, Mutah University, P.O. Box 7, Al-Karak 61710, Jordan
| | - Malak Al Ja’afreh
- Laboratory of Inorganic Materials and Polymers, Department of Chemistry, Faculty of Sciences, Mutah University, P.O. Box 7, Al-Karak 61710, Jordan
| | - Idrees F. Al-Momani
- Department of Chemistry, Faculty of Sciences, Yarmouk University, Irbid 21163, Jordan
| | - Ahmed K. Hijazi
- Department of Chemistry, Faculty of Sciences and Arts, Jordan University of Science and Technology, Irbid 22110, Jordan;
| | - Dinara Sobola
- Department of Physics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technická 2848/8, 61600 Brno, Czech Republic
- Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 61662 Brno, Czech Republic
| | - Suresh Sagadevan
- Nanotechnology & Catalysis Research Centre, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Salsabeel Al Bayaydah
- Laboratory of Inorganic Materials and Polymers, Department of Chemistry, Faculty of Sciences, Mutah University, P.O. Box 7, Al-Karak 61710, Jordan
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2
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Yu H, Xuan C, Chen N, Zhang Q, Pan B. Reductive ethylenediamine group immobilized in hybrid Pd-based nanocomposite for efficiently sequestrating selenate. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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3
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Ribeiro A, Kroetz BL, Tarley CRT, Abrao T, Parreira PS, Santos MJ. Separating selenium species by diffusion in Brazilian bentonite: a mathematical modeling approach. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:88119-88130. [PMID: 35829885 DOI: 10.1007/s11356-022-21529-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 06/10/2022] [Indexed: 06/15/2023]
Abstract
Bentonite was applied in diffusive studies for selenium, an emerging contaminant. The planar source method was used to determine the apparent and effective diffusion coefficients and assess the mobility of the selenium species. A double Gaussian function described the results. Different diffusion coefficients were associated with different mobilities, and consequently, to the coexistence of two selenium species: selenite and selenate. Apparent diffusion coefficients were higher for selenate, around 10- 10 m2 s- 1, than for selenite, around 10- 12 m2 s- 1. Results from sequential extraction and distribution coefficient justified selenate's greater mobility than selenite. Since the increase in redox potential from 448 to 511 mV may be associated with selenite oxidation in an interconversion process, the diffusion in bentonite demonstrates that applications in geological barriers deserve attention regarding the mobilization of selenium species. Interconversions can mobilize selenium, as reduced species can shift to more oxidized and mobile species, enhancing environmental contamination.
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Affiliation(s)
- Angelita Ribeiro
- Chemistry Department, State University of Londrina, Celso Garcia Cid Road-PR445, Londrina, Paraná, Brazil, 86051-990
| | - Barbara L Kroetz
- Chemistry Department, State University of Londrina, Celso Garcia Cid Road-PR445, Londrina, Paraná, Brazil, 86051-990
| | - Cesar R T Tarley
- Chemistry Department, State University of Londrina, Celso Garcia Cid Road-PR445, Londrina, Paraná, Brazil, 86051-990
| | - Taufik Abrao
- Electrical Engineering Department, State University of Londrina, Celso Garcia Cid Road-PR445, Londrina, Paraná, Brazil, 86051-990
| | - Paulo S Parreira
- Physics Department, State University of Londrina, Celso Garcia Cid Road-PR445, Londrina, Paraná, Brazil, 86051-990
| | - Maria Josefa Santos
- Chemistry Department, State University of Londrina, Celso Garcia Cid Road-PR445, Londrina, Paraná, Brazil, 86051-990.
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4
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Lyu Y, Lyu G, Li Y, Li B, Chen K, Song C, Li Z, Pan S. Effects of substituting iron for aluminum on the low-temperature catalytic activity and sulfur resistance of hydrotalcite-derived LNT catalysts. CHEMOSPHERE 2022; 304:135200. [PMID: 35667506 DOI: 10.1016/j.chemosphere.2022.135200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 05/12/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
The storage and reduction of NOx on a series of Fe-modified hydrotalcite-based lean NOx trap catalysts were assessed, together with the product selectivity. The crystal structures and micromorphologies of these materials were characterized using X-ray diffraction and scanning electron microscopy, while in situ diffuse reflectance Fourier transform infrared spectroscopy was used to evaluate the evolution of transition state species. The introduction of Fe was found to improve the synergistic interaction between the Mg and Fe in the hydrotalcite structure, allowing these catalysts to work efficiently at low temperatures. In addition, both Pt/BaO/MgAlO and Pt/BaO/MgFeO catalysts exhibited better NOx adsorption and reduction performance compared with Pt/BaO/Al2O3. The superior performance of the former two materials was attributed to the enhanced adsorption of NOx in the form of nitrates and nitrites by Fe and Mg and to the ready decomposition of these nitrates at low temperatures. A Pt/BaO/MgFeO catalyst showed excellent low temperature activity and high selectivity for N2 together with superior sulfur resistance compared with Pt/BaO/Al2O3.
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Affiliation(s)
- Yu Lyu
- State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China
| | - Gang Lyu
- State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China.
| | - Yunqing Li
- State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China
| | - Bo Li
- State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China
| | - Ke Chen
- State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China
| | - Chonglin Song
- State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China
| | - Zhenguo Li
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center, Tianjin, 300300, China
| | - Suozhu Pan
- Key Laboratory of Fluid and Power Machinery, Xihua University, Chengdu, 610039, China
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5
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Sun Y, Liu Z, Tang R, Lee CP, Wang Z, Luo M, Hua R, Jiang Q, Su X. Investigating diffusion mechanism for HTO and Se(IV)/Se(VI) in compacted Tamusu clay rock with different column lengths. RADIOCHIM ACTA 2022. [DOI: 10.1515/ract-2022-0070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Due to continuous self-sealing and good mechanical properties, the Tamusu clay rock of Inner Mongolia has been identified as the pre-selected site for high-level radioactive waste geological disposal site in China. The study of chemical behaviors related to Tamusu clay rock, such as nuclide migration, will be an important content of the performance assessment and safety assessment of the disposal repository in the future. The diffusion behavior of HTO and Se(IV)/Se(VI) with different compacted column lengths in Tamusu clay rock is discussed by the through-diffusion method. The diffusion coefficient, rock capacity factor, effective porosity, and other diffusion parameters closely related to nuclide migration are calculated, and the mechanism of nuclide diffusion is preliminarily discussed. The results show that D
a
(6.23 × 10−11∼17.96 × 10−11 m2 s−1), D
e
(1.62 × 10−11∼4.67 × 10−11 m2 s−1) for HTO increase with the increase of the compacted column length, and it is proposed that the diffusion process of HTO is affected by the change of geometrical factor and path tortuosity. D
a
(7.29 × 10−13∼1.74 × 10−13 m2 s−1), D
e
(5.15 × 10−12∼2.15 × 10−12 m2 s−1) for Se(IV), D
a
(3.11 × 10−12∼1.09 × 10−12 m2 s−1), D
e
(2.53 × 10−12∼1.09 × 10−12 m2 s−1) for Se(VI), which decrease with the increase of the compacted column length, it is mainly due to the existence of anion repulsion effect.
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Affiliation(s)
- Yuzhen Sun
- State Key Laboratory of Nuclear Resources and Environment , East China University of Technology , Nanchang 330013 , Jiangxi , China
- Jiangxi College of Traditional Chinese Medicine , Fuzhou 344000 , Jiangxi , China
| | - Zhenxing Liu
- School of Geosciences, East China University of Technology , Nanchang 330013 , Jiangxi , China
| | - Rongjing Tang
- College of Nuclear Science and Engineering, East China University of Technology , Nanchang 330013 , Jiangxi , China
| | - Chuan-Pin Lee
- College of Nuclear Science and Engineering, East China University of Technology , Nanchang 330013 , Jiangxi , China
| | - Zhifen Wang
- College of Nuclear Science and Engineering, East China University of Technology , Nanchang 330013 , Jiangxi , China
| | - Mingbiao Luo
- State Key Laboratory of Nuclear Resources and Environment , East China University of Technology , Nanchang 330013 , Jiangxi , China
| | - Rong Hua
- College of Nuclear Science and Engineering, East China University of Technology , Nanchang 330013 , Jiangxi , China
| | - Qifeng Jiang
- College of Nuclear Science and Engineering, East China University of Technology , Nanchang 330013 , Jiangxi , China
| | - Xuebin Su
- Beijing Research Institute of Chemical Engineering and Metallurgy , Beijing 101149 , China
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6
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Roy SC, Rahman MA, Celik A, Wilson S, Azmy A, Bieber J, Spanopoulos I, Islam R, Zhu X, Han FX, Islam SM. Efficient removal of chromium(VI) ions by hexagonal nanosheets of CoAl-MoS 4 layered double hydroxide. J COORD CHEM 2022. [DOI: 10.1080/00958972.2022.2101103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Subrata Chandra Roy
- Department of Chemistry, Physics, and Atmospheric Sciences, Jackson State University, Jackson, MS, USA
| | | | - Ahmet Celik
- Department of Chemistry, Physics, and Atmospheric Sciences, Jackson State University, Jackson, MS, USA
| | - Sydni Wilson
- Department of Chemistry, Physics, and Atmospheric Sciences, Jackson State University, Jackson, MS, USA
| | - Ali Azmy
- Department of Chemistry, University of South Florida, Tampa, FL, USA
| | - Jay Bieber
- Nanotechnology Research & Education Center, University of South Florida, Tampa, FL, USA
| | | | - Rafiq Islam
- Soil, Water, and Bioenergy Resources, The Ohio State University, Piketon, OH, USA
| | - Xianchun Zhu
- Department of Civil Engineering, Jackson State University, Jackson, MS, USA
| | - Fengxiang X. Han
- Department of Chemistry, Physics, and Atmospheric Sciences, Jackson State University, Jackson, MS, USA
| | - Saiful M. Islam
- Department of Chemistry, Physics, and Atmospheric Sciences, Jackson State University, Jackson, MS, USA
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7
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Hussaini M, Vohra M. LDH-TiO 2 Composite for Selenocyanate (SeCN -) Photocatalytic Degradation: Characterization, Treatment Efficiency, Reaction Intermediates and Modeling. NANOMATERIALS 2022; 12:nano12122035. [PMID: 35745375 PMCID: PMC9227849 DOI: 10.3390/nano12122035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/02/2022] [Accepted: 06/09/2022] [Indexed: 02/06/2023]
Abstract
Selenium as a nutrient has a narrow margin between safe and toxic limits. Hence, wastewater discharges from selenium-containing sources require appropriate treatment that considers health concerns and stringent selenium-related water treatment standards. This work examined the use of a photocatalysis-cum-adsorption system based on a layered double hydroxide coupled with TiO2 (LDH-TiO2) to remove aqueous phase selenocyanate (SeCN−), which is difficult to treat and requires specific treatment procedures. The synthesized LDH and LDH-TiO2 composite samples were characterized using the X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and thermogravimetry analysis (TGA) methods. The XRD results for the uncalcined LDH indicated a hydrotalcite mass with a rhombohedral structure, whereas increasing the calcination temperature indicated transition to an amorphous state. FESEM results for the LDH-TiO2 matrix indicated round titanium dioxide particles and LDH hexagonal layers. The TGA findings for uncalcined LDH showed a gradual decrease in weight up to 250 °C, followed by a short plateau and then a sharp decrease in LDH weight from 320 °C, with a net weight loss around 47%. Based on the characterization and initial selenocyanate adsorption results, the 250 °C calcined LDH-TiO2 matrix was used for the selenocyanate photocatalysis. A ~100% selenium removal was observed using LDH:TiO2 at a 1.5:1 w/w ratio with a 2 g/L dose, whereas up to 80% selenium removal was noted for LDH:TiO2 at a 0.5:1 w/w ratio. The respective difference in the efficiency of selenium treatment was attributed to enhanced LDH-based adsorption sites in the enhanced LDH:TiO2 w/w ratio. Furthermore, the selenite and selenate that occurred during SeCN− photocatalytic degradation (PCD) were also nearly completely removed via adsorption. An optimization exercise using response surface methodology (RSM) for total selenium removal showed R2 values of more than 0.95, with a prediction accuracy of more than 90%. In summary, the present findings show that the use of a photocatalysis-cum-adsorption system based on LDH-TiO2 is a promising technique to treat industrial wastewater discharges for selenocyanate and also remove the resulting intermediates.
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Affiliation(s)
- Minaam Hussaini
- Civil and Environmental Engineering Department, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia;
| | - Muhammad Vohra
- Civil and Environmental Engineering Department, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia;
- Interdisciplinary Research Center for Construction and Building Materials (IRC-CBM), King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia
- Correspondence: ; Tel.: +966-13-860-2854
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8
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Li T, Xu H, Zhang Y, Zhang H, Hu X, Sun Y, Gu X, Luo J, Zhou D, Gao B. Treatment technologies for selenium contaminated water: A critical review. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 299:118858. [PMID: 35041898 DOI: 10.1016/j.envpol.2022.118858] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 01/11/2022] [Accepted: 01/13/2022] [Indexed: 06/14/2023]
Abstract
Selenium is an indispensable trace element for humans and other organisms; however, excessive selenium in water can jeopardize the aquatic environment. Investigations on the biogeochemical cycle of selenium have shown that anthropogenic activities such as mining, refinery, and coal combustion mainly contribute to aquatic selenium pollution, imposing tremendous risks on ecosystems and human beings. Various technologies thus have been developed recently to treat selenium contaminated water to reduce its environmental impacts. This work provides a critical review on the applications, characteristics, and latest developments of current treatment technologies for selenium polluted water. It first outlines the present status of the characteristics, sources, and toxicity of selenium in water. Selenium treatment technologies are then classified into three categories: 1) physicochemical separation including membrane filtration, adsorption, coagulation/precipitation, 2) redox decontamination including chemical reduction and catalysis, and 3) biological transformation including microbial treatment and constructed wetland. Details of these methods including their overall efficiencies, applicability, advantages and drawbacks, and latest developments are systematically analyzed and compared. Although all these methods are promising in treating selenium in water, further studies are still needed to develop sustainable strategies based on existing and new technologies. Perspectives on future research directions are laid out at the end.
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Affiliation(s)
- Tianxiao Li
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, People's Republic of China
| | - Hongxia Xu
- Key Laboratory of Surficial Geochemistry of Ministry of Education, School of Earth Sciences and Engineering, Hydrosciences Department, Nanjing University, Nanjing, 210023, People's Republic of China.
| | - Yuxuan Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, People's Republic of China
| | - Hanshuo Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, People's Republic of China
| | - Xin Hu
- State Key Laboratory of Analytical Chemistry for Life Science, Center of Material Analysis and School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, People's Republic of China
| | - Yuanyuan Sun
- Key Laboratory of Surficial Geochemistry of Ministry of Education, School of Earth Sciences and Engineering, Hydrosciences Department, Nanjing University, Nanjing, 210023, People's Republic of China
| | - Xueyuan Gu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, People's Republic of China
| | - Jun Luo
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, People's Republic of China
| | - Dongmei Zhou
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, People's Republic of China
| | - Bin Gao
- Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32611, USA
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9
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Enhanced simultaneous removal of toxic (SeO4)2− and metals Cr3+ and Cu2+ using polysulfide intercalated Layered double hydroxide. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119649] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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10
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Wei X, Li X, Tang L, Yu J, Deng J, Luo T, Liang J, Chen X, Zhou Y. Exploring the role of Fe species from biochar-iron composites in the removal and long-term immobilization of SeO 42- against competing oxyanions. JOURNAL OF HAZARDOUS MATERIALS 2021; 418:126311. [PMID: 34118543 DOI: 10.1016/j.jhazmat.2021.126311] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 05/16/2021] [Accepted: 05/31/2021] [Indexed: 06/12/2023]
Abstract
Carbothermal reduction is a convenient and cost-effective method to produce biochar (BC) supported iron-based nano-particles (INP) for oxyanion contaminants removal. However, considering the possible desorption of the target oxyanion during change of the surrounding environment, the detailed removal mechanisms remain unclear and the long-term efficiency of different INPs cannot be predicted. In this study, different BC/Fe composites were synthesized by controlling the pyrolysis temperatures (500-800 °C). BC/Fe3O4 composite synthesized at 500 °C (BC/Fe500) possessed the strongest surface acidity thus with the best SeO42- removal performance, and BC/Fe0/Fe3O4 composite synthesized at 650 °C (BC/Fe650) possessed the best reducing ability toward SeO42-. Through the co-removal experiments (SeO42- and common competing oxyanions co-existed) and the investigation of Se stability loaded on BC/Fe composites, the removal of SeO42- by BC/Fe500 through highly reversible adsorption could not achieve long-term immobilization of Se, making it an appropriate adsorbent for pre-treatment only, while the efficient reduction of SeO42- to Se0 by BC/Fe650 could largely improve its long-term stability. This study supplies a possible strategy for Se immobilization against common competing oxyanions.
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Affiliation(s)
- Xue Wei
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
| | - Xiaodong Li
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
| | - Lin Tang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China.
| | - Jiangfang Yu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
| | - Jiaqin Deng
- State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, China
| | - Ting Luo
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
| | - Jie Liang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
| | - Xuwu Chen
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
| | - Yaoyu Zhou
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
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11
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Wang M, Akamatsu H, Dabo I, Sasaki K. Environmental impact of amino acids on the release of selenate immobilized in hydrotalcite: Integrated interpretation of experimental and density-functional theory study. CHEMOSPHERE 2021; 274:129927. [PMID: 33979939 DOI: 10.1016/j.chemosphere.2021.129927] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 01/26/2021] [Accepted: 02/07/2021] [Indexed: 06/12/2023]
Abstract
The environmental impact of amino acids on the release of SeO42- immobilized into hydrotalcite (Mg2Al-LDH) which belongs to the layered double hydroxides (LDHs) family was investigated by experimental study and the observed layer structure of hydrotalcite was verified through density-functional theory (DFT) calculations. Glycine, l-cysteine, and l-aspartic acid, which have smaller molecular sizes, can release SeO42- largely due to intercalation, unstabilization of Mg2Al-LDH and simple dissolution, while l-tryptophan and l-phenylalanine caused limited SeO42- release due to their larger sizes and aromaticity. XRD patterns for the solid residues after intercalation of amino acids revealed that the layer distance of Mg2Al-LDH was partially expanded. The main peaks and shoulder features corresponding to d003 diffraction were well explained by DFT simulations using glycine as a model: the layer spacing of the main peak is responsible for the remaining SeO42- and singly stacked glycine molecule and the layer spacing of the shoulder peak was well explained by doubly stacked glycine molecules. Hydrogen bonds between amino acids and hydroxyl ions in the metallic layers of Mg2Al-LDH were responsible for the stable configuration of the intercalated Mg2Al-LDH. This study indicates potential limitations to the stability of low-level radioactive wastes of 79Se in repositories which are affected by smaller molecules of amino acids released through degradation of organic matters in the pedosphere.
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Affiliation(s)
- Mengmeng Wang
- Department of Earth Resources Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
| | - Hirofumi Akamatsu
- Department of Applied Chemistry, Kyushu University, Fukuoka, 819-0395, Japan.
| | - Ismaila Dabo
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, United States.
| | - Keiko Sasaki
- Department of Earth Resources Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
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12
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Preparation of wheat bran-titanium dioxide (TiO2) composite and its application for selenium adsorption. J Cereal Sci 2021. [DOI: 10.1016/j.jcs.2021.103230] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Anion exclusion and sorption effect for compacted bentonite: the dependency of diffusion coefficients and capacity of HTO and Se(IV). J Radioanal Nucl Chem 2021. [DOI: 10.1007/s10967-021-07688-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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Li Z, Yuan Y, Ma L, Zhang Y, Jiang H, He J, Hu Y, Yuan S, Ginder-Vogel M, Tu S. Simultaneous Kinetics of Selenite Oxidation and Sorption on δ-MnO 2 in Stirred-Flow Reactors. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:2902. [PMID: 33809051 PMCID: PMC7998768 DOI: 10.3390/ijerph18062902] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Revised: 03/09/2021] [Accepted: 03/10/2021] [Indexed: 11/16/2022]
Abstract
Selenium (Se) is an essential and crucial micronutrient for humans and animals, but excessive Se brings negativity and toxicity. The adsorption and oxidation of Se(IV) on Mn-oxide surfaces are important processes for understanding the geochemical fate of Se and developing engineered remediation strategies. In this study, the characterization of simultaneous adsorption, oxidation, and desorption of Se(IV) on δ-MnO2 mineral was carried out using stirred-flow reactors. About 9.5% to 25.3% of Se(IV) was oxidized to Se(VI) in the stirred-flow system in a continuous and slow process, with the kinetic rate constant k of 0.032 h-1, which was significantly higher than the apparent rate constant of 0.0014 h-1 obtained by the quasi-level kinetic fit of the batch method. The oxidation reaction was driven by proton concentration, and its rate also depended on the Se(IV) influent concentration, flow rate, and δ-MnO2 dosage. During the reaction of Se(IV) and δ-MnO2, Mn(II) was produced and adsorbed strongly on Mn oxide surfaces, which was evidenced by the total reflectance Fourier transform infrared (ATR-FTIR) results. The X-ray photoelectron spectroscopy (XPS) data indicated that the reaction of Se(VI) on δ-MnO2 produced Mn(III) as the main product. These results contribute to a deeper understanding of the interface chemical process of Se(IV) with δ-MnO2 in the environment.
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Affiliation(s)
- Zheyong Li
- College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; (Z.L.); (Y.Z.); (H.J.); (J.H.); (Y.H.); (S.Y.)
- Hubei Research Centre for Environment Pollution and Remediation, Wuhan 430070, China
| | - Yajun Yuan
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China;
- Department of Environmental Engineering Design, Hubei Urban Construction Design Institute Co., Ltd., Wuhan 430051, China
| | - Lin Ma
- CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China;
| | - Yihui Zhang
- College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; (Z.L.); (Y.Z.); (H.J.); (J.H.); (Y.H.); (S.Y.)
- Hubei Research Centre for Environment Pollution and Remediation, Wuhan 430070, China
| | - Hongwei Jiang
- College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; (Z.L.); (Y.Z.); (H.J.); (J.H.); (Y.H.); (S.Y.)
- Hubei Research Centre for Environment Pollution and Remediation, Wuhan 430070, China
| | - Jiqiang He
- College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; (Z.L.); (Y.Z.); (H.J.); (J.H.); (Y.H.); (S.Y.)
- Hubei Research Centre for Environment Pollution and Remediation, Wuhan 430070, China
| | - Yifan Hu
- College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; (Z.L.); (Y.Z.); (H.J.); (J.H.); (Y.H.); (S.Y.)
- Hubei Research Centre for Environment Pollution and Remediation, Wuhan 430070, China
| | - Shoushu Yuan
- College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; (Z.L.); (Y.Z.); (H.J.); (J.H.); (Y.H.); (S.Y.)
- Chenzhou Dongjiang Lake Water Environmental Protection Bureau, Chenzhou 423000, China
| | - Matthew Ginder-Vogel
- Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA;
| | - Shuxin Tu
- College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; (Z.L.); (Y.Z.); (H.J.); (J.H.); (Y.H.); (S.Y.)
- Hubei Research Centre for Environment Pollution and Remediation, Wuhan 430070, China
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15
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Wang F, Wang X, Chen Q, Song N. Extension of a biotic ligand model for predicting the toxicity of metalloid selenate to wheat: The effects of pH, phosphate and sulphate. CHEMOSPHERE 2021; 264:128424. [PMID: 33032220 DOI: 10.1016/j.chemosphere.2020.128424] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 09/17/2020] [Accepted: 09/22/2020] [Indexed: 06/11/2023]
Abstract
It has not been well understood that the influences of pH and accompanying anions on the toxicity of selenate (Se(VI)). The influences of pH and major anions on Se(VI) toxicity to wheat root elongation were determined and modeled based on the biotic ligand model (BLM) and free ion activity model (FIAM) concepts. Results showed that EC50[Se(VI)]T values increased from 162 to 251 μM as the pH values increased from 4.5 to 8.0, indicating that the pH increases alleviated the Se(VI) toxicity. The EC50{SeO42-} values increased from 133 to 203 μM while the EC50{HSeO4-} values sharply decreased from 210 to 0.102 nM with the pH increasing from 4.5 to 8.0. The effect of pH on Se(VI) toxicity could be explained by the changes of Se(VI) species in different pH solutions as SeO42- and HSeO4-were differently toxic to wheat root elongation. The toxicity of Se(VI) decreased with the increasing activities of H2PO4- and SO42- but not for NO3- and Cl- activities, indicating that only H2PO4- and SO42- had competitive effects with Se(VI) on the binding sites. An extended BLM was developed to consider effects of pH, phosphate and sulphate, and stability constants of SeO42-, HSeO4-, H2PO4- and SO42- to the binding sites were obtained: log [Formula: see text] = 3.45, log [Formula: see text] = 5.98, log [Formula: see text] = 2.05, log [Formula: see text] = 1.85. Results implied that BLM performed much better than FIAM in the wheat root elongation prediction when coupling with toxic species SeO42- and HSeO4-, and the competitions of H2PO4- and SO42- for the binding sites while developing the Se(VI)-BLM.
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Affiliation(s)
- Fangli Wang
- Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, China
| | - Xuexia Wang
- Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Qinghua Chen
- Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, China
| | - Ningning Song
- Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, China.
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16
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Alaei R, Javanshir S, Behnamfard A. Treatment of gold ore cyanidation wastewater by adsorption onto a Hydrotalcite-type anionic clay as a novel adsorbent. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2020; 18:779-791. [PMID: 33312602 PMCID: PMC7721945 DOI: 10.1007/s40201-020-00503-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Accepted: 06/22/2020] [Indexed: 06/12/2023]
Abstract
The treatment of cyanide contaminated wastewater from a gold processing plant was performed by the synthesized nanostructured Layered Double Hydroxide (LDH) which has known as a Hydrotalcite-type anionic clay. LDH was synthesized by the co-precipitation process, characterized by X-ray fluorescence (XRF), X-ray powder diffraction (XRD), scanning electron microscope (SEM) Brunauer-Emmett-Teller (BET), Fourier-transform infrared spectroscopy (FTIR) and Wavelength Dispersive X-ray analysis (WDX) and applied for removal of free cyanide from both synthetic solution and mining effluent. The maximum particle size of synthesized LDH was determined to be 4 nm based on the Scherrer's equation. The maximum loading capacity of LDH, 60 mg/g, indicates that LDH is an interesting adsorbent for cyanide removal. The data modeling showed that the kinetic and equilibrium data best fitted by FPKM and RPIM, respectively, also, rate-controlling step in the adsorption process is intra-particle diffusion based on Weber-Morris plot, and the adsorption of CN- onto LDH is a two-step process. The thermodynamic studies confirm that the adsorption of free cyanide on Mg/Al LDH is a spontaneous and endothermic process. The energy of activation for adsorption of free cyanide on Mg/Al LDH was determined to be 6.14 kJ/mol, which is in the range physicochemical sorption. The mining wastewater treatment was performed by the synthesized LDH. The adsorption experiments showed that more than 90% of free cyanide was removed from the real solution during a short period of contact time, which confirms the ability of LDH for the treatment of industrial cyanide contaminated wastewater. Graphical abstract.
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Affiliation(s)
- Rasool Alaei
- Mining engineering Department, Faculty of Engineering, University of Birjand, Birjand, Iran
| | - Sepideh Javanshir
- Mining engineering Department, Faculty of Engineering, University of Birjand, Birjand, Iran
| | - Ali Behnamfard
- Mining engineering Department, Faculty of Engineering, University of Birjand, Birjand, Iran
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17
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Pincus LN, Rudel HE, Petrović PV, Gupta S, Westerhoff P, Muhich CL, Zimmerman JB. Exploring the Mechanisms of Selectivity for Environmentally Significant Oxo-Anion Removal during Water Treatment: A Review of Common Competing Oxo-Anions and Tools for Quantifying Selective Adsorption. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:9769-9790. [PMID: 32515947 PMCID: PMC10514893 DOI: 10.1021/acs.est.0c01666] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Development of novel adsorbents often neglects the competitive adsorption between co-occurring oxo-anions, overestimating realistic pollutant removal potentials, and overlooking the need to improve selectivity of materials. This critical review focuses on adsorptive competition between commonly co-occurring oxo-anions in water and mechanistic approaches for the design and development of selective adsorbents. Six "target" oxo-anion pollutants (arsenate, arsenite, selenate, selenite, chromate, and perchlorate) were selected for study. Five "competing" co-occurring oxo-anions (phosphate, sulfate, bicarbonate, silicate, and nitrate) were selected due to their potential to compete with target oxo-anions for sorption sites resulting in decreased removal of the target oxo-anions. First, a comprehensive review of competition between target and competitor oxo-anions to sorb on commonly used, nonselective, metal (hydr)oxide materials is presented, and the strength of competition between each target and competitive oxo-anion pair is classified. This is followed by a critical discussion of the different equations and models used to quantify selectivity. Next, four mechanisms that have been successfully utilized in the development of selective adsorbents are reviewed: variation in surface complexation, Lewis acid/base hardness, steric hindrance, and electrostatic interactions. For each mechanism, the oxo-anions, both target and competitors, are ranked in terms of adsorptive attraction and technologies that exploit this mechanism are reviewed. Third, given the significant effort to evaluate these systems empirically, the potential to use computational quantum techniques, such as density functional theory (DFT), for modeling and prediction is explored. Finally, areas within the field of selective adsorption requiring further research are detailed with guidance on priorities for screening and defining selective adsorbents.
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Affiliation(s)
- Lauren N Pincus
- School of Forestry and Environmental Studies, Yale University, 195 Prospect St., New Haven, Connecticut 06511, United States
- Yale University, Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), New Haven, Connecticut 06511, United States
- Yale Center for Green Chemistry and Green Engineering, 370 Prospect St., New Haven, Connecticut 06511, United States
| | - Holly E Rudel
- Yale University, Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), New Haven, Connecticut 06511, United States
- Department of Chemical and Environmental Engineering, Yale University, 17 Hillhouse Ave, New Haven, Connecticut 06511, United States
| | - Predrag V Petrović
- School of Forestry and Environmental Studies, Yale University, 195 Prospect St., New Haven, Connecticut 06511, United States
- Yale Center for Green Chemistry and Green Engineering, 370 Prospect St., New Haven, Connecticut 06511, United States
| | - Srishti Gupta
- Yale University, Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), New Haven, Connecticut 06511, United States
- School of Sustainable Engineering and The Built Environment, Arizona State University, Box 3005, Tempe, Arizona 85287-3005 United States
| | - Paul Westerhoff
- Yale University, Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), New Haven, Connecticut 06511, United States
- School of Sustainable Engineering and The Built Environment, Arizona State University, Box 3005, Tempe, Arizona 85287-3005 United States
| | - Christopher L Muhich
- Yale University, Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), New Haven, Connecticut 06511, United States
- School for the Engineering of Mater, Transport, and Energy, Ira A Fulton Schools of Engineering, Arizona State University, Tempe, Arizona 85001, United States
| | - Julie B Zimmerman
- School of Forestry and Environmental Studies, Yale University, 195 Prospect St., New Haven, Connecticut 06511, United States
- Yale University, Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), New Haven, Connecticut 06511, United States
- Yale Center for Green Chemistry and Green Engineering, 370 Prospect St., New Haven, Connecticut 06511, United States
- Department of Chemical and Environmental Engineering, Yale University, 17 Hillhouse Ave, New Haven, Connecticut 06511, United States
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18
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Tian Q, Guo B, Sasaki K. Influence of silicate on the structural memory effect of layered double hydroxides for the immobilization of selenium. JOURNAL OF HAZARDOUS MATERIALS 2020; 395:122674. [PMID: 32335282 DOI: 10.1016/j.jhazmat.2020.122674] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 03/14/2020] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
The influence of silicate on the structural memory effect of layered double hydroxides (LDHs) has been rarely reported. In this study, five kinds of calcined LDHs (CLDHs) were synthesized and used as adsorbents for the sorption of selenium with or without silicate, under the initial pH 10 and 13, respectively, characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), infrared spectroscopy (IR), nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), and N2 adsorption-desorption isotherm. The results indicated that silicate can significantly affect the phase transformation of CLDHs, and the sorption amounts of selenite and selenate dramatically decreased in the presence of silicate. Specifically, silicate can react with MgO and Al2O3 in CLDHs to generate magnesium silicate hydrate and geopolymer-like substance which were covered on the surface of particles, blocking the hydroxylation of metal oxides. However, higher pH suppressed the interaction between MgO and silicate and enhanced the formation of geopolymer-like substance, which promoted the regeneration of LDHs. Al in CLDHs plays a critical role in the regeneration of LDHs. Besides, the ternary oxides (CLDH-2, Mg2Al0.75Fe0.25-oxide; CLDH-3, Mg2Al0.5Fe0.5-oxide) possessed larger specific surface areas (127.7 and 158.2 m2/g) and consequently presented more resistance to the effect of silicate.
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Affiliation(s)
- Quanzhi Tian
- Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan.
| | - Binglin Guo
- Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Keiko Sasaki
- Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan.
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19
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Tian Q, Guo B, Chuaicham C, Sasaki K. Mechanism analysis of selenium (VI) immobilization using alkaline-earth metal oxides and ferrous salt. CHEMOSPHERE 2020; 248:126123. [PMID: 32059334 DOI: 10.1016/j.chemosphere.2020.126123] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 12/16/2019] [Accepted: 02/03/2020] [Indexed: 06/10/2023]
Abstract
The immobilization of selenate (SeO42-) using metal oxides (CaO and MgO) and ferrous salt as the immobilization reagents were examined by the leaching test and solid-phase analysis via XRD, XAFS, TGA, and XPS. The results indicated that nearly all of SeO42- was reduced to SeO32- in the CaO-based reaction within 7 days. Then, the generated SeO32- was mainly sorbed onto the iron-based minerals (Fe2O3 and FeOOH) through the formation of both bidentate mononuclear edge-sharing (1E) and monodentate mononuclear corner-sharing (1V) inner-sphere surface complexes, suggested by PHREEQC simulation and EXAFS analysis. Differently, less amount of SeO42- (approximately 45.50%) was reduced to SeO32- for the MgO-based reaction. However, if the curing time increases to a longer time (more than 7 days), the further reduction could occur because there are still Fe(II) species in the matrix. As for the associations of Se in the solid residue, most of the selenium (SeO32- and SeO42-) was preferentially distributed onto the Mg(OH)2 through outer-sphere adsorption. Definitely, this research can provide a deep understanding of the immobilization of selenium using alkaline-earth metal oxide related materials and ferrous substances.
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Affiliation(s)
- Quanzhi Tian
- Department of Earth Resources Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
| | - Binglin Guo
- Department of Earth Resources Engineering, Kyushu University, Fukuoka, 819-0395, Japan
| | - Chitiphon Chuaicham
- Department of Earth Resources Engineering, Kyushu University, Fukuoka, 819-0395, Japan
| | - Keiko Sasaki
- Department of Earth Resources Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
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20
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Tian Q, Guo B, Sasaki K. Immobilization mechanism of Se oxyanions in geopolymer: Effects of alkaline activators and calcined hydrotalcite additive. JOURNAL OF HAZARDOUS MATERIALS 2020; 387:121994. [PMID: 31901840 DOI: 10.1016/j.jhazmat.2019.121994] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 12/26/2019] [Accepted: 12/28/2019] [Indexed: 06/10/2023]
Abstract
Geopolymers have been widely adopted to stabilize the cationic pollutants. However, few studies have focused on the immobilization of anionic species. In this study, the immobilization of SeO32- and SeO42- was explored for the first time using geopolymer activated by different alkaline solutions (NaOH and Na2SiO3) with and without calcined hydrotalcite (CHT), characterized by TCLP, XRD, FTIR, TG, NMR, XAFS, and N2 adsorption-desorption isotherm. Na2SiO3-activated geopolymers without CHT additive showed lower leaching percentages of SeO32- and SeO42- (approximately 10 % and 18 %) than NaOH-activated geopolymers (approximately 58 % and 74 %). It has been proven that electrostatic interaction is the main association mode of SeO32- and SeO42- in both NaOH- and Na2SiO3-activated geopolymers. Hence, compactness plays a vital role in the Se leaching from geopolymer. The addition of CHT reduced the compactnesses of both NaOH- and Na2SiO3-geopolymers. Due to the formation of hydrotalcite, the CHT additive contributed to immobilize SeO32- and SeO42- in NaOH-activated geopolymers. However, this phenomenon was not observed in Na2SiO3-activated geopolymers. Thus, the leaching amount of Se greatly increased from Na2SiO3-activated geopolymers with CHT additive. This study provides new insights on the application of geopolymer to immobilize anionic pollutants.
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Affiliation(s)
- Quanzhi Tian
- Department of Earth Resources Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
| | - Binglin Guo
- Department of Earth Resources Engineering, Kyushu University, Fukuoka, 819-0395, Japan
| | - Keiko Sasaki
- Department of Earth Resources Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
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21
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Frachini E, Constantino LV, Abrao T, Santos MJ. A new approach to evaluate toxic metal transport in a catchment. ENVIRONMENTAL MONITORING AND ASSESSMENT 2020; 192:234. [PMID: 32170528 DOI: 10.1007/s10661-019-7950-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Accepted: 11/04/2019] [Indexed: 06/10/2023]
Abstract
Competitive sorption and desorption of Cd2+, Pb2+, and Hg2+ onto riverbank and sediment samples of an area impacted by pyritic residue in a Southern Brazilian catchment were evaluated. Although these ions are considered poorly mobile, a new approach has been proposed to assess their behavior and associated risk. In this sense, factorial design and three-dimensional surface methodology are proposed to describe the competitive sorption behavior of the metal ion in the environmental matrix, as well as an innovative mobilization factor (MF) to describe the desorption rate from the integration of the normalized difference of sorption-desorption fluorescence peaks. Sorption was carried out with a central composite factorial design (23) to estimate simultaneous effects of independent variables. Three-dimensional surface analysis indicated increasing Cd2+ equilibrium concentration (Ceq) with Hg2+ and Pb2+ initial concentration (Ci), showing synergistic effect and low Cd2+ affinity to the solid phase. Statistical analysis presented [Formula: see text] as a significant variable for cadmium and lead dynamics, although [Formula: see text] was also significant for Hg2+ releasing to the liquid phase. After integrating the sorption and desorption fluorescence peaks, the MF for Cd2+, Pb2+, and Hg2+ was around 0.2, 0.5, and 0.1 in riverbank sediment, and 0.3, 0.9, and 0.1 in sediment, respectively. Hence, consistent ion mobilization along the river was observed, with Pb2+ mobilizing 9 and 6 times more than Hg2+ and Cd2+, respectively. The transport of ions such as Pb2+ and Hg2+, usually considered immobile, has indeed occurred, causing contamination through the watershed and increasing environmental risk. Graphical Abstract A new approach to determine toxic metal mobilization factor in a river catchment.
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Affiliation(s)
- Emilli Frachini
- Chemistry Department, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Parana, 86051-990, Brazil
| | - Leonel Vinicius Constantino
- Chemistry Department, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Parana, 86051-990, Brazil
| | - Taufik Abrao
- Electrical Engineering Department, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Parana, 86051-990, Brazil
| | - Maria Josefa Santos
- Chemistry Department, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Parana, 86051-990, Brazil.
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Mo Y, Vincent T, Faur C, Guibal E. Se(VI) sorption from aqueous solution using alginate/polyethylenimine membranes: Sorption performance and mechanism. Int J Biol Macromol 2020; 147:832-843. [DOI: 10.1016/j.ijbiomac.2019.10.055] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 10/04/2019] [Accepted: 10/05/2019] [Indexed: 02/01/2023]
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23
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Tian Q, Sasaki K. A novel composite of layered double hydroxide/geopolymer for co-immobilization of Cs + and SeO 42- from aqueous solution. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 695:133799. [PMID: 31756845 DOI: 10.1016/j.scitotenv.2019.133799] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 08/02/2019] [Accepted: 08/05/2019] [Indexed: 06/10/2023]
Abstract
Geopolymers are always considered as promising materials for the treatment of radioactive wastes. In order to extend the application of geopolymer to the immobilization of anionic species, a novel composite of layered double hydroxide/geopolymer (LDH/GEO) was synthesized and applied for cosorption of Cs+ and SeO42-. The ability of LDH/GEO to sorb Cs+ was maintained as that of pure GEO, even though the surface of geopolymer was homogeneously covered by the LDH platelets. The sorption of Cs+ onto LDH/GEO composite occurred via ion exchange, which was controlled by particle diffusion. It is different with Cs+ sorption onto pure GEO governed by film diffusion. Therefore, "Pocket diffusion" was proposed for the particle diffusion as the case of LDH/GEO because this kind of diffusion would be restricted in a certain distance around the ring entrance gate due to the amorphous essence of GEO. For SeO42- sorption by LDH/GEO, ion-exchange with the interlayer NO3- and surface sorption could be the main mechanisms. Importantly, the sorption speed of SeO42- achieved by LDH/GEO composite was much faster than that by pure LDH. In the binary system (Cs++ SeO42-), the sorption of Cs+ was slightly suppressed compared to the single system, which might be due to the formation of ion-pair complex of [CsSeO4]-. However, it did not have negative effect on the SeO42- sorption. In the presence of other cations or anions, the cosorption performances of Cs+ and SeO42- were satisfactorily obtained. Furthermore, the Cs+ and SeO42- sorption densities were superior to the previously reported values. The combined MgAl-LDH/geopolymer composite could be a promising material for the immobilization of Cs+ and SeO42-, and this work would provide guidance for the development of geopolymer-based materials for environmental applications.
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Affiliation(s)
- Quanzhi Tian
- Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishiku, Fukuoka 819-0395, Japan.
| | - Keiko Sasaki
- Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishiku, Fukuoka 819-0395, Japan.
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24
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Anion additives in rapid breakdown anodization for nonmetal-doped TiO2 nanotube powders. Electrochem commun 2019. [DOI: 10.1016/j.elecom.2019.106610] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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25
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Qiao W, Bai H, Tang T, Miao J, Yang Q. Recovery and utilization of phosphorus in wastewater by magnetic Fe3O4/Zn-Al-Fe-La layered double hydroxides(LDHs). Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.05.046] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Hudcová B, Erben M, Vítková M, Komárek M. Antimonate adsorption onto Mg-Fe layered double hydroxides in aqueous solutions at different pH values: Coupling surface complexation modeling with solid-state analyses. CHEMOSPHERE 2019; 229:236-246. [PMID: 31078880 DOI: 10.1016/j.chemosphere.2019.05.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Revised: 04/22/2019] [Accepted: 05/02/2019] [Indexed: 06/09/2023]
Abstract
In this study, the importance of Sb behavior under different pH conditions has been addressed with respect to its stabilization in aqueous solutions using Mg-Fe layered double hydroxides (LDHs). The Sb(V) adsorption onto Mg-Fe LDHs was performed at different initial Sb(V) concentrations and pH values (pH 5.5, 6.5 and 7.5). The removal rate and the maximal adsorbed amount increased with decreasing pH values. Moreover, the surface complexation modeling (SCM) predicted preferable formation of monodentate mononuclear and bidentate binuclear complexes on the Mg-Fe LDH surface. Spectroscopic (X-ray diffraction analysis, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy) and microscopic (scanning electron microscopy and energy-dispersive X-ray spectroscopy) techniques were used to further specify the adsorption mechanisms. The influence of chemical adsorption, surface-induced precipitation of brandholzite Mg[Sb(OH)6]2·6H2O, formation of brandholzite-like phases and/or anion exchange was observed. Moreover, Sb(V) was nonhomogeneously distributed on the Mg-Fe LDH surface at all pH values. The surface complexation modeling supported by solid-state analyses provided a strong tool to investigate the binding arrangements of Sb(V) on the Mg-Fe LDH surface. Such a complex mechanistic/modeling approach has not previously been presented and enables prediction of the Sb(V) adsorption behavior onto Mg-Fe LDHs under different conditions, evaluating their possible use in actual applications.
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Affiliation(s)
- Barbora Hudcová
- Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, Prague-Suchdol, 165 00, Czech Republic
| | - Milan Erben
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice, 532 10, Czech Republic
| | - Martina Vítková
- Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, Prague-Suchdol, 165 00, Czech Republic
| | - Michael Komárek
- Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, Prague-Suchdol, 165 00, Czech Republic.
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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. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 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] [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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Wang D, Xue MY, Wang YK, Zhou DZ, Tang L, Cao SY, Wei YH, Yang C, Liang DL. Effects of straw amendment on selenium aging in soils: Mechanism and influential factors. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 657:871-881. [PMID: 30677952 DOI: 10.1016/j.scitotenv.2018.12.021] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 11/30/2018] [Accepted: 12/03/2018] [Indexed: 06/09/2023]
Abstract
Soil dissolved organic matter (DOM) alters heavy metal availability, but whether straw amendment can manipulate soil selenium (Se) speciation and availability through DOM mineralization remains unclear. In this study, allochthonous maize straw and selenate were incubated together in four different soils for 1 y. The transformation and availability of DOM associated Se (DOM-Se) was investigated during aging. Results indicated that soil solution and soil particle surfaces were dominated by hexavalent hydrophilic acid-bound Se (Hy-Se). The amount of fulvic acid bound Se in soil solution (SOL-FA-Se) was higher than humic acid bound Se in soil solution (SOL-HA-Se), except in krasnozems, and mainly existed as hexavalent Se (Se(VI)). Tetravalent Se (Se(IV)) was the main valence state of FA-Se adsorbed on soil particle surfaces (EX-FA-Se) after 5 w of aging. The proportion of soil-available Se (SOL + EX-Se) decreased with increasing straw rate. However, under an application rate of 7500 kg·hm-2, soluble Se fraction (SOL-Se) reduction was minimal in acidic soils (18.7%-34.7%), and the organic bound Se fraction (OM-Se) was maximally promoted in alkaline soils (18.2%-39.1%). FA and HON could enhance the availability of Se in the soil solution and on particle surfaces of acidic soil with high organic matter content. While Se incorporation with HA could accelerate the fixation of Se into the solid phase of soil. Three mechanisms were involved in DOM-Se aging: (1) Reduction, ligand adsorption, and inner/outer-sphere complexation associated with the functional groups of straw-derived DOM, including hydroxyls, carboxyl, methyl, and aromatic phenolic compounds; (2) interconnection of EX-FA-Se between non-residual and residual Se pools; and (3) promotion by soil electrical conductivity (EC), clay, OM, and straw application. The dual effect of DOM on Se aging was highly reliant on the characteristics of the materials and soil properties. In conclusion, straw amendment could return selenium in soil and reduce soluble Se loss.
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Affiliation(s)
- Dan Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Ming-Yue Xue
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Ying-Kun Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - De-Zhi Zhou
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Li Tang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Sheng-Yan Cao
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yu-Hong Wei
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Chen Yang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Dong-Li 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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Layered Double Hydroxide Sorbents for Removal of Selenium from Power Plant Wastewaters. CHEMENGINEERING 2019. [DOI: 10.3390/chemengineering3010020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Selenium is an essential trace element but is increasingly becoming a contaminant of concern in the electric power industry due to the challenges of removing solubilized selenate anions, particularly in the presence of sulfate. In this work, we evaluate granulated layered double hydroxide (LDH) materials as sorbents for selenium removal from wastewaters obtained from a natural gas power plant with the aim to elucidate the effect of competing ions on the sorption capacities for selenium removal. We first present jar test data, followed by small-scale column testing in 0.43 inch (1.1 cm) and 2 inch (5.08 cm) diameter testbed columns for the treatment of as-obtained cooling tower blowdown waters and plant wastewaters. Finally, we present field results from a pilot-scale study evaluating the LDH media for treatment of cooling tower blowdown water. We find that despite the high levels of total dissolved solids and competing sulfate ions, the selenium oxoanions and other regulated metals such as chromium and arsenic are successfully removed using LDH media without needing any pre-treatment or pH adjustment of the wastewater.
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Zhou L, Xu X, Xia S. Effects of sulfate on simultaneous nitrate and selenate removal in a hydrogen-based membrane biofilm reactor for groundwater treatment: Performance and biofilm microbial ecology. CHEMOSPHERE 2018; 211:254-260. [PMID: 30077104 DOI: 10.1016/j.chemosphere.2018.07.092] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 07/14/2018] [Accepted: 07/16/2018] [Indexed: 06/08/2023]
Abstract
Effects of sulfate on simultaneous nitrate and selenate removal in a hydrogen-based membrane biofilm reactor (MBfR) for groundwater treatment was identified with performance and biofilm microbial ecology. In whole operation, MBfR had almost 100% removal of nitration even with 50 mg mL-1 sulfate. Moreover, selenate degradation increased from 95% to approximate 100% with sulfate addition, indicating that sulfate had no obvious effects on nitrate degradation, and even partly promoted selenate removal. Short-term sulfate effect experiment further showed that Gibbs free energy of reduction (majority) and abiotic sulfide oxidation (especially between sulfate and selenate) contributed to degradable performance with sulfate. Microbial ecology showed that high percentage of Hydrogenophaga (≥75%) was one of the contributors for the stable and efficient nitrate degradation. Chemoheterotrophy (ratio>0.3) and dark hydrogen oxidation (ratio>0.3) were the majority of functional profile for biofilm in MBfR, and sulfate led to profiles of sulfate respiration and respiration of sulfur compounds in biofilm. Additionally, no special bacteria for selenate degradation was identified in biofilm microbial ecology, and selenate degradation was relied on Hydrogenophaga (75% of ecology percentage with sulfate addition) and Desulfovibrionaceae (4% of ecology percentage with sulfate addition). But with overloading sulfate, Desulfovibrionaceae was prior to sulfate degradation for energy supply and thus inhibited selenate removal.
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Affiliation(s)
- Lijie Zhou
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China
| | - Xiaoyin Xu
- State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Institute of Pollution Control and Ecological Security, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
| | - Siqing Xia
- State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Institute of Pollution Control and Ecological Security, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
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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] [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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do Nascimento FH, Masini JC. An electrochemical sequential injection method to investigate the adsorption of selenite on Fe(III) polyhydroxy cations intercalated vermiculite. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 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] [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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