Comprehensive study on the removal of chromate from aqueous solution by synthesized kaolin supported nanoscale zero-valent iron
Wang, Chuan1; Xu, Zhen1,2; Ding, Gang1; Wang, Xianxiang1; Zhao, Maojun1; Ho, Steven Sai Hang3; Li, Yunchun1
2016-03-02
发表期刊DESALINATION AND WATER TREATMENT
卷号57期号:11页码:5065-5078
文章类型Article
摘要A removal mechanism of chromate (Cr) by synthesized kaolin supported nanoscale zero-valent iron (K-nZVI) from aqueous solution is demonstrated. Parameters which potentially influenced the functioning of K-nZVI have been investigated as well. Based on the scanning electron microscopy, Fourier transform infrared spectroscopes, X-ray crystal powder diffraction and X-ray photoelectron spectroscopy identifications, we confirm that amorphous Fe-0 core/FexOy shell nZVI can be successfully loaded into the pores and cracks, and onto the surface of kaolin. Removal efficiency of Cr by K-nZVI decreased with increasing initial pH and Cr(VI) concentration, but increased while K-nZVI dosage increased. Humic acid and phosphate had similar dual impacts on chromium removal by K-nZVI, and the inhibitory effect was obvious at high concentrations in spite of their different reaction mechanisms. In contrast, high concentrations of sulfate and nitrate could advance the chromium removal. Adsorption isotherms indicate that the removal processes are endothermic. The data obtained can be better explained with Langmuir than Freundlich model. At the conditions of 318K and optimized pH 4.0, the maximum adsorption capacity was 33.39mgg(-1) illustrating that K-nZVI was effective for the removal of total Cr. The removal mechanism is proposed to divide into four phases, including: (1) aqueous Cr(VI) ions are captured on the surface of K-nZVI; (2) the captured Cr(VI) are partly reduced to Cr(III) accompanied by Fe-0 oxidizing to Fe2+; (3) part of oxidized Fe2+ continues to reduce Cr(VI); and (4) produced Cr(III), Fe2+, and Fe3+ are formed passivation layers on the K-nZVI surface which prevent further removal of chromium and result in redundant Fe-0.
关键词Chromate Kaolin Supported Nanoscale Zero-valent Iron Removal Mechanism
WOS标题词Science & Technology ; Technology ; Physical Sciences
DOI10.1080/19443994.2014.1002430
关键词[WOS]HEXAVALENT CHROMIUM ; WASTE-WATER ; ENHANCED REMOVAL ; FE-0 NANOPARTICLES ; HUMIC-ACID ; CR(VI) ; REMEDIATION ; REDUCTION ; MECHANISM ; REACTIVITY
收录类别SCI
语种英语
WOS研究方向Engineering ; Water Resources
WOS类目Engineering, Chemical ; Water Resources
WOS记录号WOS:000368037100032
引用统计
被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5858
专题黄土与第四纪地质国家重点实验室(2010~)
作者单位1.Sichuan Agr Univ, Coll Sci, Yaan 625014, Peoples R China
2.Zhejiang Univ, Dept Chem, Hangzhou 310027, Zhejiang, Peoples R China
3.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Key Lab Aerosol Sci & Technol, Xian 710061, Peoples R China
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Wang, Chuan,Xu, Zhen,Ding, Gang,et al. Comprehensive study on the removal of chromate from aqueous solution by synthesized kaolin supported nanoscale zero-valent iron[J]. DESALINATION AND WATER TREATMENT,2016,57(11):5065-5078.
APA Wang, Chuan.,Xu, Zhen.,Ding, Gang.,Wang, Xianxiang.,Zhao, Maojun.,...&Li, Yunchun.(2016).Comprehensive study on the removal of chromate from aqueous solution by synthesized kaolin supported nanoscale zero-valent iron.DESALINATION AND WATER TREATMENT,57(11),5065-5078.
MLA Wang, Chuan,et al."Comprehensive study on the removal of chromate from aqueous solution by synthesized kaolin supported nanoscale zero-valent iron".DESALINATION AND WATER TREATMENT 57.11(2016):5065-5078.
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