Enhanced adsorption of arsenate by spinel zinc ferrite nano particles: Effect of zinc content and site occupation

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英文篇名：Enhanced adsorption of arsenate by spinel zinc ferrite nano particles: Effect of zinc content and site occupation 作者：Can ; Wu ; Yunyun ; Xu ; Si ; Xu ; Jingwei ; Tu ; Chen ; Tian ; Zhang ; Lin 英文作者：Can Wu;Yunyun Xu;Si Xu;Jingwei Tu;Chen Tian;Zhang Lin;School of Environment and Energy, The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters (Ministry of Education), South China University of Technology;Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, South China University of Technology; 英文关键词：Zinc ferrite;;Arsenate;;Adsorption;;Atom occupancy;;Hydroxyl groups 中文刊名：HJKB 英文刊名：环境科学学报(英文版) 机构：School of Environment and Energy, The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters (Ministry of Education), South China University of Technology;Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, South China University of Technology; 出版日期：2019-03-14 出版单位：Journal of Environmental Sciences 年：2019 期：v.79 基金：supported by the National Natural Science Foundation of China(Nos.21836002 and 21477129);; Guangdong Innovative and Entrepreneurial Research Team Program(No.2016ZT06N569);; the Fundamental Research Funds for the Central Universities(Nos.2017PY009 and 2017BQ054) 语种：英文; 页：HJKB201905022 页数：8 CN：05 ISSN：11-2629/X 分类号：253-260

摘要

In this work, zinc ferrite spinel with different zinc contents(ZnxFe_3-xO_4) was synthesized by a hydrothermal method and used for removing As(V) in aqueous solution. X-ray diffraction(XRD) results indicated that in the crystal structure of ZnxFe_3-xO_4, the zinc atoms tended to occupy the octahedral sites for x < 0.6 and diffused into the tetrahedral sites gradually with x > 0.6. The size of ZnxFe_3-xO_4 crystallites increased with the increasing zinc content. Batch adsorption experiments showed that the adsorption isotherms could be well described by the Langmuir model, while the adsorption kinetics followed the pseudo-second-order kinetic model. Zinc ferrite exhibited the highest adsorption capacity towards As(V) when x = 0.6. Study of the mechanism indicated that doping with zinc increased the number of surface hydroxyl groups on ferrite spinel, and thus enhanced the adsorption capacity when x = 0.6. This work revealed the effects of doping site and content of metal atoms on the adsorption ability of ferrite spinel towards As(V).
        In this work, zinc ferrite spinel with different zinc contents(ZnxFe_3-xO_4) was synthesized by a hydrothermal method and used for removing As(V) in aqueous solution. X-ray diffraction(XRD) results indicated that in the crystal structure of ZnxFe_3-xO_4, the zinc atoms tended to occupy the octahedral sites for x < 0.6 and diffused into the tetrahedral sites gradually with x > 0.6. The size of ZnxFe_3-xO_4 crystallites increased with the increasing zinc content. Batch adsorption experiments showed that the adsorption isotherms could be well described by the Langmuir model, while the adsorption kinetics followed the pseudo-second-order kinetic model. Zinc ferrite exhibited the highest adsorption capacity towards As(V) when x = 0.6. Study of the mechanism indicated that doping with zinc increased the number of surface hydroxyl groups on ferrite spinel, and thus enhanced the adsorption capacity when x = 0.6. This work revealed the effects of doping site and content of metal atoms on the adsorption ability of ferrite spinel towards As(V).

引文

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