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

被引：23
作者：
Wu, Can [1 ,2 ]
Xu, Yunyun [1 ,2 ]
Xu, Si [1 ,2 ]
Tu, Jingwei [1 ,2 ]
Tian, Chen [1 ,2 ]
Lin, Zhang [1 ,2 ]
机构：
[1] South China Univ Technol, Sch Environm & Energy, Minist Educ, Key Lab Pollut Control & Ecosyst Restorat Ind Clu, Guangzhou 510006, Guangdong, Peoples R China
[2] South China Univ Technol, Guangdong Engn & Technol Res Ctr Environm Nanomat, Guangzhou 510006, Guangdong, Peoples R China
来源：
JOURNAL OF ENVIRONMENTAL SCIENCES | 2019年 / 79卷
基金：
中国国家自然科学基金;
关键词：
Zinc ferrite; Arsenate; Adsorption; Atom occupancy; Hydroxyl groups; NANOPARTICLES; REMOVAL; MAGNETIZATION; OCCUPANCY; STRATEGY;
D O I：
10.1016/j.jes.2018.09.010
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this work, zinc ferrite spinel with different zinc contents (ZnxFe3-xO4) 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 ZnxFe3-xO4 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 ZnxFe3-xO4 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). (C) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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收藏
页码：248 / 255
页数：8
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