Efficient removal of Cr(VI) from wastewater under sunlight by Fe(II)-doped TiO2 spherical shell

被引：97

作者：

Xu, S. C. ^{[1
]}

Pan, S. S. ^{[1
]}

Xu, Y. ^{[1
]}

Luo, Y. Y. ^{[1
]}

Zhang, Y. X. ^{[1
]}

Li, G. H. ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Solid State Phys, Anhui Key Lab Nanomat & Nanotechnol, Key Lab Mat Phys, Hefei 230031, Peoples R China

[2] Univ Sci & Technol China, Hefei 230026, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2015年 / 283卷

基金：

中国国家自然科学基金;

关键词：

Photocatalyst; Fe doped; TiO2; Removal of Cr(VI); Plating wastewater; ZERO-VALENT IRON; NANOPARTICULATED ZEROVALENT IRON; CR-VI; HEXAVALENT CHROMIUM; AQUEOUS-SOLUTION; PHOTO-REDUCTION; UV-LIGHT; IN-SITU; CARBON; ADSORPTION;

D O I：

10.1016/j.jhazmat.2014.08.071

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Fe(II)-doped TiO2 spherical shell catalyst was synthesized by one-pot hydrothermal method. The photocatalytic removal of Cr(VI) from plating wastewater under sunlight of the catalyst was demonstrated. It was found that the removal effectiveness of about 99.99% for initial Cr(VI) concentration of 102.3 ppm and 99.01% for 153.4 ppm under 3 h sunlight irradiation is realized. The Fe(II) ions serve not only as reducing agents for reducing the Cr(VI) to Cr(III) but also as an intermedium of a two-step reduction, in which the TiO2 photoreduces the Fe(II) ions to Fe atoms firstly, and then the Fe atoms reduce the Cr(VI) to Cr(III). The improved photocatalytic activity of the catalyst is considered due to the synergistic effect of a multi reducing process by Fe(II) doping. The extended optical response and effectively utilization of sunlight of the special spherical-shell-like morphology also contribute to the enhanced photocatalytic activity. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：7 / 13

页数：7

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