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
刊名ENVIRONMENTAL SCIENCE & TECHNOLOGY
2014
卷号48期号:14页码:8078-8085
学科分类Engineering; Environmental Sciences & Ecology
DOI10.1021/es405804m
英文摘要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.
收录类别SCI
WOS记录号WOS:000339227500050
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被引频次:83[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
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
中国科学院高能物理研究所_多学科研究中心
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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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