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Cr(VI) Adsorption and Reduction by Humic Acid Coated on Magnetite
Jiang, WJ; Cai Q(蔡泉); Xu W(徐伟); Cai, Q; Xu, W; Yang, MW; Cai, Y; Dionysiou, DD; O'Shea, KE
2014
发表期刊ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷号48期号:14页码:8078-8085
摘要Easily separable humic acid coated magnetite (HA-Fe3O4) nanoparticles are employed for effective adsorption and reduction of toxic Cr(VI) to nontoxic Cr(III). The adsorption and reduction of Cr(VI) is effective under acidic, neutral, and basic pH conditions. The chromium adsorption nicely fits the Langmuir isotherm model, and the removal of Cr(VI) from aqueous media by HA-Fe3O4 particles follows pseudo-second-order kinetics. Characterization of the Cr-loaded HA-Fe3O4 materials by X-ray absorption near edge structure spectroscopy (XANES) indicates Cr(VI) was reduced to Cr(III) while the valence state of the iron core is unchanged. Fe K-edge extended X-ray absorption fine structure spectroscopy (EXAFS) and X-ray diffraction measurements also indicate no detectable transformation of the Fe3O4 core occurs during Cr(VI) adsorption and reduction. Thus, suggesting HA on the surface of HA-Fe3O4 is responsible for the reduction of Cr(VI) to Cr(III). The functional groups associated with HA act as ligands leading to the Cr(III) complex via a coupled reduction complexation mechanism. Cr K-edge EXAFS demonstrates the Cr(III) in the Cr-loaded HA-Fe3O4 materials has six neighboring oxygen atoms likely in an octahedral geometry with average bond lengths of 1.98 angstrom. These results demonstrate that easily separable HA-Fe3O4 particles have promising potential for removal and detoxification of Cr(VI) in aqueous media.
学科领域Engineering; Environmental Sciences & Ecology
DOI10.1021/es405804m
收录类别SCI
WOS记录号WOS:000339227500050
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被引频次:114[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/225003
专题多学科研究中心
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GB/T 7714
Jiang, WJ,Cai Q,Xu W,et al. Cr(VI) Adsorption and Reduction by Humic Acid Coated on Magnetite[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2014,48(14):8078-8085.
APA Jiang, WJ.,蔡泉.,徐伟.,Cai, Q.,Xu, W.,...&O'Shea, KE.(2014).Cr(VI) Adsorption and Reduction by Humic Acid Coated on Magnetite.ENVIRONMENTAL SCIENCE & TECHNOLOGY,48(14),8078-8085.
MLA Jiang, WJ,et al."Cr(VI) Adsorption and Reduction by Humic Acid Coated on Magnetite".ENVIRONMENTAL SCIENCE & TECHNOLOGY 48.14(2014):8078-8085.
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