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One-step electrospinning preparation of magnetic NZVI@TiO2 nanofibers for enhanced immobilization of U(VI) from aqueous solution. J Radioanal Nucl Chem 2023. [DOI: 10.1007/s10967-022-08696-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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2
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Li H, Si R, Wang W, Huang Y, Xiang M, Wang C, Chen S, Cao W, Lu Z, Huang M. Sulfidated nanoscale zero-valent iron dispersed in dendritic mesoporous silica nanospheres for degrading tetrabromobisphenol A. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126586] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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3
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Lu H, Dong J, Xi B, Cai P, Xia T, Zhang M. Transport and retention of porous silicon-coated zero-valent iron in saturated porous media. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 276:116700. [PMID: 33621736 DOI: 10.1016/j.envpol.2021.116700] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 01/26/2021] [Accepted: 02/05/2021] [Indexed: 06/12/2023]
Abstract
Porous silicon-coated zero-valent iron (Fe0@p-SiO2) is a promising material for in-situ contaminated groundwater remediation. However, investigations of factors that affect the transport of Fe0@p-SiO2 remain incomplete. In the present study, Fe0@p-SiO2 composites were prepared by a SiO2-coated technology, and a series of column experiments were conducted to examine the effects of media size, ionic strength, and injection velocity and concentration on retention and transport in saturated porous media. Results showed that the obtained Fe0@p-SiO2 is a core-shell composite with zero-valent iron as the core and porous silicon as the shell. Media size, injection velocity, Fe0 concentration, and ionic strength had a significant impact on the transport of Fe0@p-SiO2. Fe0@p-SiO2 effluent concentrations decreased with a smaller media size. Increasing initial particle concentration and ionic strength led to a decrease in particle transport. High particle retention was observed near the middle of the column, especially with high injection concentration. That was also observable in the condition of lower injection velocity or finer media. The results indicated that two transport behaviors during particles transport, which were "agglomeration-straining" and "detachment-re-migration". Moreover, the dominated mechanisms for Fe0@p-SiO2 transport and retention in saturated porous media are hydrodynamic dispersion and interception. Given the results, in practical engineering applications, proper injection velocity and concentration should be selected depending on the pollution status of groundwater and the geochemical environment to ensure an effective in-situ reaction zone.
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Affiliation(s)
- Haojie Lu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China; Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun, 130026, PR China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China
| | - Jun Dong
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun, 130026, PR China.
| | - Beidou Xi
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China
| | - Peiyao Cai
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun, 130026, PR China
| | - Tian Xia
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun, 130026, PR China
| | - Mengyue Zhang
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun, 130026, PR China
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4
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Li Z, Zhang J, Nie S, Wen X, Djaziri S, Wang DY. Bioinspired growth of iron derivatives on mesoporous silica: effect on thermal degradation and fire behavior of polystyrene. NANOTECHNOLOGY 2020; 31:065601. [PMID: 31618714 DOI: 10.1088/1361-6528/ab4e46] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Aiming to investigate the influence of pore property of mesoporous material on thermal degradation and fire behavior of polystyrene (PS), the ultrafine iron derivatives were uniformly grown on the interior wall of SBA-15 via the coordination-induced assembly by bioinspired polydopamine (PDA). The resultant SBA-15@PDA@Fe was verified by various characterizations with the dominant component of FeOOH. Compared with PS composites with SBA-15, PS composites with SBA-15@PDA@Fe revealed the notably divergent alteration in thermal and thermal-oxidation degradation behavior, which was determined by the changed pore property. The iron derivatives in SBA-15 mesopores possessed the stronger affinity to aerobic volatiles than anaerobic volatiles (via π-π coordination), which inhibited the release of oxidatively decomposed products and enhanced thermal-oxidation stability. In addition, SBA-15@PDA@Fe was capable to preferentially improve limiting oxygen index, accompanied by the decrease of smoke production through suppressing smoke precursors. The glass transition temperature (T g) of PS/SBA-15 was slightly increased via the bioinspired modification.
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Affiliation(s)
- Zhi Li
- School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, People's Republic of China
- IMDEA Materials Institute, C/Eric Kandel, 2, E-28906 Getafe, Madrid, Spain
| | - Jing Zhang
- IMDEA Materials Institute, C/Eric Kandel, 2, E-28906 Getafe, Madrid, Spain
| | - Shibin Nie
- School of Energy Resources and Safety, Anhui University of Science and Technology, Huainan, Anhui 232001, People's Republic of China
| | - Xin Wen
- Nanomaterials Physicochemistry Department, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, al. Piastów 45, 70-311, Szczecin, Poland
| | - Soundes Djaziri
- IMDEA Materials Institute, C/Eric Kandel, 2, E-28906 Getafe, Madrid, Spain
| | - De-Yi Wang
- IMDEA Materials Institute, C/Eric Kandel, 2, E-28906 Getafe, Madrid, Spain
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Li X, Zeng S, Qu X, Dai J, Liu X, Wang R, Zhang Z, Qiu S. Synthesis and Characterization of Cu Decorated Zeolite A@Void@Et-PMO Nanocomposites for Removal of Methylene Blue by a Heterogeneous Fenton Reaction. Chem Res Chin Univ 2019. [DOI: 10.1007/s40242-019-8362-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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6
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Lu H, Dong J, Zhang M, Hu W, Wen C, Yang C, Wu Y. SiO2-coated zero-valent iron nanocomposites for aqueous nitrobenzene reduction in groundwater: Performance, reduction mechanism and the effects of hydrogeochemical constituents. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.08.081] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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7
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Removal of Chromium(VI) from Groundwater Using Oil Shale Ash Supported Nanoscaled Zero-valent Iron. Chem Res Chin Univ 2018. [DOI: 10.1007/s40242-018-8104-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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8
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Mahmoud ME, Saad EA, Soliman MA, Abdelwahab MS. Synthesis and surface protection of nano zerovalent iron (NZVI) with 3-aminopropyltrimethoxysilane for water remediation of cobalt and zinc and their radioactive isotopes. RSC Adv 2016. [DOI: 10.1039/c6ra11049e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A method is described to synthesize a novel magnetic nano-sorbent via surface modification and protection of nano-zerovalent iron (NZVI) with 3-aminopropyl trimethoxysilane for the formation of NZVI-NH2.
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Affiliation(s)
- Mohamed E. Mahmoud
- Faculty of Sciences
- Chemistry Department
- Alexandria University
- Alexandria
- Egypt
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9
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Wang W, Cheng Y, Kong T, Cheng G. Iron nanoparticles decoration onto three-dimensional graphene for rapid and efficient degradation of azo dye. JOURNAL OF HAZARDOUS MATERIALS 2015; 299:50-8. [PMID: 26091894 DOI: 10.1016/j.jhazmat.2015.06.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 05/30/2015] [Accepted: 06/03/2015] [Indexed: 05/16/2023]
Abstract
Porous three-dimensional graphene (3DG) prepared by chemical vapor deposition, was utilized as a matrix to support nanoscale zero-valent iron (nZVI) particles. The strategies to manipulate the morphology, distribution and size of nZVI particles on the 3DG support were demonstrated. The immobilized nZVI particles with a size of 100 nm and dense deposition were achieved. A 94.5% of orange IV azo dye was removed in 60 min using nZVI particles immobilized 3DG (3DG-Fe), whereas only 70.9% was removed by free Fe nanoparticles in aqueous solution. Meanwhile, a reaction rate with orange IV of 3DG-Fe was approximately 5-fold faster than that of free Fe nanoparticles. The effects of 3DG-Fe dosage, dye concentration, reaction pH and temperature on dye degradation were also addressed. Those results imply that both lowering pH and increasing temperature led to higher reaction efficiency and rate. The kinetic data reveal that the degradation process of orange IV dye, modeled by the pseudo-first-order kinetics, might involve adsorption and redox reaction with an activation energy of 39.2 kJ/mol.
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Affiliation(s)
- Wei Wang
- Key Laboratory of Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, 398 Ruoshui Road, Suzhou Industrial Park, Jiangsu 215123, China
| | - Yilin Cheng
- Key Laboratory of Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, 398 Ruoshui Road, Suzhou Industrial Park, Jiangsu 215123, China; University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China
| | - Tao Kong
- Key Laboratory of Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, 398 Ruoshui Road, Suzhou Industrial Park, Jiangsu 215123, China
| | - Guosheng Cheng
- Key Laboratory of Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, 398 Ruoshui Road, Suzhou Industrial Park, Jiangsu 215123, China.
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10
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Yang Z, Qiu X, Fang Z, Pokeung T. Transport of nano zero-valent iron supported by mesoporous silica microspheres in porous media. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2015; 71:1800-1805. [PMID: 26067499 DOI: 10.2166/wst.2015.158] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Effective in situ remediation of groundwater requires the successful delivery of reactive iron particles through sand. However, the agglomeration of nano zero-valent iron (NZVI) particles limits the migration distance, which inhibits their usefulness. In the study described herein, NZVI supported by mesoporous silica microspheres covered with FeOOH (SiO2@FeOOH@Fe) was synthesized, and its mobility was demonstrated on the basis of transport in porous media. Degradation of decabromodiphenyl ether (BDE209) was more efficient by SiO2@FeOOH@Fe than by 'bare' NZVI. Breakthrough curves and mass recovery showed the mobility of SiO2@FeOOH@Fe in granular media was better than that of bare NZVI. It increased greatly in the presence of natural organic matter (NOM) and decreased when high Ca2+ and Mg2+ concentrations were encountered. Analysis of the transport data on the basis of filtration theory showed diffusion to be the main mechanism for particle removal in silicon sand. Increasing the NOM may decrease agglomeration of the grains of sand, which has a positive effect on the mobility of SiO2@FeOOH@Fe. Presumably, increasing the concentrations of Ca2+ and Mg2+ compresses the diffuse double layer of SiO2@FeOOH@Fe, resulting in a reduction of mobility.
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Affiliation(s)
- Zhangmei Yang
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China E-mail:
| | - Xinhong Qiu
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China E-mail:
| | - Zhanqiang Fang
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China E-mail:
| | - Tsang Pokeung
- Department of Science and Environmental Studies, The Hong Kong Institute of Education, Hong Kong 00852, China
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11
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Bordeleau G, Martel R, Bamba AN, Blais JF, Ampleman G, Thiboutot S. Nitroglycerin degradation mediated by soil organic carbon under aerobic conditions. JOURNAL OF CONTAMINANT HYDROLOGY 2014; 166:52-63. [PMID: 25086776 DOI: 10.1016/j.jconhyd.2014.06.012] [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: 11/25/2013] [Revised: 06/20/2014] [Accepted: 06/27/2014] [Indexed: 06/03/2023]
Abstract
The presence of nitroglycerin (NG) has been reported in shallow soils and pore water of several military training ranges. In this context, NG concentrations can be reduced through various natural attenuation processes, but these have not been thoroughly documented. This study aimed at investigating the role of soil organic matter (SOM) in the natural attenuation of NG, under aerobic conditions typical of shallow soils. The role of SOM in NG degradation has already been documented under anoxic conditions, and was attributed to SOM-mediated electron transfer involving different reducing agents. However, unsaturated soils are usually well-oxygenated, and it was not clear whether SOM could participate in NG degradation under these conditions. Our results from batch- and column-type experiments clearly demonstrate that in presence of dissolved organic matter (DOM) leached from a natural soil, partial NG degradation can be achieved. In presence of particulate organic matter (POM) from the same soil, complete NG degradation was achieved. Furthermore, POM caused rapid sorption of NG, which should result in NG retention in the organic matter-rich shallow horizons of the soil profile, thus promoting degradation. Based on degradation products, the reaction pathway appears to be reductive, in spite of the aerobic conditions. The relatively rapid reaction rates suggest that this process could significantly participate in the natural attenuation of NG, both on military training ranges and in contaminated soil at production facilities.
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Affiliation(s)
- Geneviève Bordeleau
- Institut National de la Recherche Scientifique, Centre Eau, Terre et Environnement (INRS-ETE), 490 de la Couronne, Quebec City, QC, Canada, G1K 9A9.
| | - Richard Martel
- Institut National de la Recherche Scientifique, Centre Eau, Terre et Environnement (INRS-ETE), 490 de la Couronne, Quebec City, QC, Canada, G1K 9A9.
| | - Abraham N'Valoua Bamba
- Université Laval, Département de Géographie, Faculté de foresterie, de géographie et de géomatique, Pavillon Abitibi-Price, 2405, rue de la Terrasse, Local 3137, Quebec City, QC, Canada, G1V 0A6.
| | - Jean-François Blais
- Institut National de la Recherche Scientifique, Centre Eau, Terre et Environnement (INRS-ETE), 490 de la Couronne, Quebec City, QC, Canada, G1K 9A9.
| | - Guy Ampleman
- Defence Research and Development Canada - Valcartier, 2459 Pie-XI Blvd. North, Quebec City, QC, Canada, G3J 1X5.
| | - Sonia Thiboutot
- Defence Research and Development Canada - Valcartier, 2459 Pie-XI Blvd. North, Quebec City, QC, Canada, G3J 1X5.
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12
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Xie Y, Fang Z, Qiu X, Tsang EP, Liang B. Comparisons of the reactivity, reusability and stability of four different zero-valent iron-based nanoparticles. CHEMOSPHERE 2014; 108:433-436. [PMID: 24582360 DOI: 10.1016/j.chemosphere.2014.01.076] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Revised: 01/22/2014] [Accepted: 01/30/2014] [Indexed: 06/03/2023]
Abstract
Our previous reports showed that nano zero-valent iron (nZVI), steel pickle liquor for the synthesis of nZVI (S-nZVI), nZVI immobilised in mesoporous silica microspheres (SiO2@FeOOH@Fe) and nano Ni/Fe bimetallic particles (Ni/Fe) have been proved to show good property for elimination of polybrominated diphenyl ethers (PBDEs). However, it is necessary to compare their reactivity, reusability and stability when applied to in situ remediation. In this study, the performances of different iron-based nanoparticles were compared through reusability, sedimentation and iron dissolution experiments. The SiO2@FeOOH@Fe and Ni/Fe nanoparticles were shown to have higher reusability and stability, as they could be reused more than seven times, and that the SiO2@FeOOH@Fe can effectively avoid leaching iron ions into the solution and causing secondary pollution in the reaction. This study may serve as a reference for PBDE remediation in the future.
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Affiliation(s)
- Yingying Xie
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System, Guangzhou 510006, China
| | - Zhanqiang Fang
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System, Guangzhou 510006, China.
| | - Xinhong Qiu
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System, Guangzhou 510006, China
| | - Eric Pokeung Tsang
- Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System, Guangzhou 510006, China; Department of Science and Environmental Studies, Hong Kong Institute of Education, Hong Kong 00852, Hong Kong, China.
| | - Bin Liang
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System, Guangzhou 510006, China
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13
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Sun X, Yan Y, Li J, Han W, Wang L. SBA-15-incorporated nanoscale zero-valent iron particles for chromium(VI) removal from groundwater: mechanism, effect of pH, humic acid and sustained reactivity. JOURNAL OF HAZARDOUS MATERIALS 2014; 266:26-33. [PMID: 24374562 DOI: 10.1016/j.jhazmat.2013.12.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2013] [Revised: 10/18/2013] [Accepted: 12/01/2013] [Indexed: 06/03/2023]
Abstract
Nanoscale zero-valent iron particles (NZVIs) were incorporated inside the channels of SBA-15 rods by a "two solvents" reduction technique and used to remove Cr(VI) from groundwater. The resulting NZVIs/SBA-15 composites before and after reaction were characterized by N2 adsorption/desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Results helped to propose the mechanism of Cr(VI) removal by NZVIs/SBA-15, where Cr(VI) in aqueous was firstly impregnated into the channels of the silica, then adsorbed on the surfaces of the incorporated NZVIs and reduced to Cr(III) directly in the inner pores of the silica. Corrosion products included Fe2O3, FeO(OH), Fe3O4 and Cr2FeO4. Batch experiments revealed that Cr(VI) removal decreased from 99.7% to 92.8% when the initial solution pH increased from 5.5 to 9.0, accompanied by the decrease of the kobs from 0.600 to 0.024 min(-1). Humic acid (HA) had a little effect on the removal efficiency of Cr(VI) by NZVIs/SBA-15 but could decrease the reduction rate. The stable reduction of NZVIs/SBA-15 was observed within six cycles. NZVIs/SBA-15 composites offer a promising alternative material to remove heavy metals from groundwater.
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Affiliation(s)
- Xia Sun
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China; School of Chemistry and Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, PR China.
| | - Yubo Yan
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China
| | - Jiansheng Li
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.
| | - Weiqing Han
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China
| | - Lianjun Wang
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.
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14
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Rocks SA, Zhu H, Dorey R, Holmes P. Harmful or Helpful, the Toxicity and Safety of Nano-sized Medicine. Nanomedicine (Lond) 2014. [DOI: 10.1007/978-1-4614-2140-5_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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15
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Petala E, Dimos K, Douvalis A, Bakas T, Tucek J, Zbořil R, Karakassides MA. Nanoscale zero-valent iron supported on mesoporous silica: characterization and reactivity for Cr(VI) removal from aqueous solution. JOURNAL OF HAZARDOUS MATERIALS 2013; 261:295-306. [PMID: 23959249 DOI: 10.1016/j.jhazmat.2013.07.046] [Citation(s) in RCA: 142] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2013] [Revised: 07/18/2013] [Accepted: 07/21/2013] [Indexed: 06/02/2023]
Abstract
MCM-41-supported nanoscale zero-valent iron (nZVI) was sytnhesized by impregnating the mesoporous silica martix with ferric chloride, followed by chemical reduction with NaHB4. The samples were studied with a combination of characterization techniques such as powder X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) and Mössbauer spectroscopy, N2 adsorption measurements, transmission electron microscopy (TEM), magnetization measurements, and thermal analysis methods. The experimental data revealed development of nanoscale zero-valent iron particles with an elliptical shape and a maximum size of ∼80 nm, which were randomly distributed and immobilized on the mesoporous silica surface. Surface area measurements showed that the porous MCM-41 host matrix maintains its hexagonal mesoporous order structure and exhibits a considerable high surface area (609 m(2)/g). Mössbauer and magnetization measurements confirmed the presence of core-shell iron nanoparticles composed of a ferromagnetic metallic core and an oxide/hydroxide shell. The kinetic studies demonstrated a rapid removal of Cr(VI) ions from the aqueous solutions in the presence of these stabilized nZVI particles on MCM-41, and a considerably increased reduction capacity per unit mass of material in comparison to that of unsupported nZVI. The results also indicate a highly pH-dependent reduction efficiency of the material, whereas their kinetics was described by a pseudo-first order kinetic model.
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Affiliation(s)
- Eleni Petala
- Department of Materials Science and Engineering, University of Ioannina, GR-45110 Ioannina, Greece; Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, 17.listopadu 1192/12, 771 46 Olomouc, Czech Republic
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16
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Li Y, Zhang Y, Li J, Sheng G, Zheng X. Enhanced reduction of chlorophenols by nanoscale zerovalent iron supported on organobentonite. CHEMOSPHERE 2013; 92:368-374. [PMID: 23399303 DOI: 10.1016/j.chemosphere.2013.01.030] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Revised: 12/13/2012] [Accepted: 01/07/2013] [Indexed: 06/01/2023]
Abstract
The reactivity of nanoscale zerovalent iron (NZVI) on removing chlorophenols (2-chlorophenol, 2,4-dichlorophenol, 2,4,6-trichlorophenol and pentachlorophenol) was remarkably enhanced by using a hydrophobic support of organobentonite (CTMA-Bent), namely the bentonite modified with organic cetyltrimethylammonium (CTMA) cations. The complete dechlorination of chlorophenols and total conversion into phenol using this novel NZVI/CTMA-Bent combination was observed in batch experiments. The kinetic studies suggested that the reduction of chlorophenols by NZVI was accelerated due to the enhanced adsorption onto CTMA-Bent, which facilitated the mass transfer of chlorophenols from aqueous to iron surface. The enhanced reduction rate by NZVI/CTMA-Bent was positively related to the hydrophobicity of chlorophenols, and an increasing linear relationship was obtained between the relative enhancement on reaction rate constants (k2/k1) and logKow values of chlorophenols. XPS results suggested there were fewer precipitates of ferric (hydro)xides formed on the surface of NZVI/CTMA-Bent, which may also lead to the improved reactivity and repetitive usability of NZVI/CTMA-Bent on removing chlorophenols.
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Affiliation(s)
- Yimin Li
- College of Chemistry and Chemical Engineering, Shaoxing University, Zhejiang 312000, PR China.
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17
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Zhang R, Li J, Liu C, Shen J, Sun X, Han W, Wang L. Reduction of nitrobenzene using nanoscale zero-valent iron confined in channels of ordered mesoporous silica. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.02.040] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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18
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Pawlett M, Ritz K, Dorey RA, Rocks S, Ramsden J, Harris JA. The impact of zero-valent iron nanoparticles upon soil microbial communities is context dependent. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:1041-9. [PMID: 23007947 DOI: 10.1007/s11356-012-1196-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Accepted: 09/12/2012] [Indexed: 05/20/2023]
Abstract
Nanosized zero-valent iron (nZVI) is an effective land remediation tool, but there remains little information regarding its impact upon and interactions with the soil microbial community. nZVI stabilised with sodium carboxymethyl cellulose was applied to soils of three contrasting textures and organic matter contents to determine impacts on soil microbial biomass, phenotypic (phospholipid fatty acid (PLFA)), and functional (multiple substrate-induced respiration (MSIR)) profiles. The nZVI significantly reduced microbial biomass by 29 % but only where soil was amended with 5 % straw. Effects of nZVI on MSIR profiles were only evident in the clay soils and were independent of organic matter content. PLFA profiling indicated that the soil microbial community structure in sandy soils were apparently the most, and clay soils the least, vulnerable to nZVI suggesting a protective effect imparted by clays. Evidence of nZVI bactericidal effects on Gram-negative bacteria and a potential reduction of arbuscular mycorrhizal fungi are presented. Data imply that the impact of nZVI on soil microbial communities is dependent on organic matter content and soil mineral type. Thereby, evaluations of nZVI toxicity on soil microbial communities should consider context. The reduction of AM fungi following nZVI application may have implications for land remediation.
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Affiliation(s)
- Mark Pawlett
- School of Applied Sciences, Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK.
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Ling X, Li J, Zhu W, Zhu Y, Sun X, Shen J, Han W, Wang L. Synthesis of nanoscale zero-valent iron/ordered mesoporous carbon for adsorption and synergistic reduction of nitrobenzene. CHEMOSPHERE 2012; 87:655-660. [PMID: 22365414 DOI: 10.1016/j.chemosphere.2012.02.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2011] [Revised: 02/01/2012] [Accepted: 02/01/2012] [Indexed: 05/31/2023]
Abstract
Nanoscale zero-valent iron (NZVI) supported on ordered mesoporous carbon (OMC) was synthesized through liquid phase reduction route. The NZVI/OMC composite was characterized by X-ray diffraction, N(2) adsorption/desorption and transmission electron microscopy. Results reveal that the composite possesses ordered mesostructure with NZVI distributing homogeneously on the surface of OMC support. The removal effects of nitrobenzene (NB) in water with OMC, NZVI/OMC and non-supported NZVI were evaluated. Results indicate that NZVI/OMC shows enhanced removal efficiency, which is attributed to its adsorption and synergistic reduction for NB. The transformation process of NB was further investigated by HPLC. Nitrosobenzene and phenylhydroxylamine were detected as intermediate products and aniline was the final reductive product.
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Affiliation(s)
- Xiaofeng Ling
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China
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Qiu X, Fang Z, Liang B, Gu F, Xu Z. Degradation of decabromodiphenyl ether by nano zero-valent iron immobilized in mesoporous silica microspheres. JOURNAL OF HAZARDOUS MATERIALS 2011; 193:70-81. [PMID: 21802203 DOI: 10.1016/j.jhazmat.2011.07.024] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Revised: 07/01/2011] [Accepted: 07/07/2011] [Indexed: 05/31/2023]
Abstract
The agglomeration of nanoparticles reduces the surface area and reactivity of nano zero-valent iron (NZVI). In this paper, highly dispersive and reactive NZVI immobilized in mesoporous silica microspheres covered with FeOOH was synthesized to form reactive mesoporous silica microspheres (SiO(2)@FeOOH@Fe). The characteristics of SiO(2)@FeOOH@Fe were analyzed by transmission electron microscopy, Fourier transform infrared spectroscopy simultaneous thermal analysis, X-ray photoelectron spectroscopy, and Brunnaer-Emmett-Teller surface area analysis. The mean particle size of the reactive mesoporous silica microspheres was 450 nm, and its specific surface area was 383.477 m(2) g(-1). The degradation of dcabromodiphenyl ether (BDE209) was followed pseudo-first-order kinetics, and the observed reaction rate constant could be improved by increasing the SiO(2)@FeOOH@Fe dosage and by decreasing the initial BDE209 concentration. The stability and longevity of the immobilized Fe nanoparticles were evaluated by repeatedly renewing the BDE209 solution in the reactor. The stable degradation of BDE209 by SiO(2)@FeOOH@Fe was observed within 10 cycles. Agglomeration-resistance and magnetic separation of SiO(2)@FeOOH@Fe were also performed. The improved dispersion of SiO(2)@FeOOH@Fe in solution after one-month storage and its good performance in magnetic separation indicated that SiO(2)@FeOOH@Fe has the potential to be efficiently applied to environmental remediation.
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Affiliation(s)
- Xinhong Qiu
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China
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