Effect of Ti(III) Surface Defects on the Process of Photocatalytic Reduction of Hexavalent Chromium

被引：24

作者：

Qin, Hongxia

Bian, Yingying

Zhang, Yaxi

Liu, Longfei

Bian, Zhenfeng ^{[1
]}

机构：

[1] Shanghai Normal Univ, Educ Minist, Key Lab Resource Chem, Shanghai 200234, Peoples R China

来源：

CHINESE JOURNAL OF CHEMISTRY | 2017年 / 35卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Ti3+ modification; titanium dioxide; photocatalytic reduction; hexavalent chromium; surface selective adsorption and desorption; SELF-DOPED TIO2; MICROWAVE-ASSISTED SYNTHESIS; VISIBLE-LIGHT PHOTOCATALYST; GRAPHENE OXIDE COMPOSITES; CR(VI) REDUCTION; WASTE-WATER; SOLVOTHERMAL SYNTHESIS; PHENOL DEGRADATION; ACTIVATED CARBON; AQUEOUS-SOLUTION;

D O I：

10.1002/cjoc.201600578

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this paper, the process of photocatalytic reduction of hexavalent chromium was investigated over Ti3+-modified TiO2 photocatalysts. The Ti3+ surface defects were repaired by annealing as-prepared sample at different temperatures to control the amount of Ti3+ sites. The samples were characterized by SEM, XRD, BET, UV-vis absorption, EPR and XPS. The results showed Ti3+ defects were successfully doped in TiO2. The surface selective adsorption of hexavalent chromium [Cr2O72- (Cr(VI))] and the desorption of trivalent chromium [Cr3+ (Cr(III))] were investigated during the process of photocatalytic reduction. Zeta potential results presented that the increased positive charges due to more Ti3+ defects on the surface show a significant improvement for adsorption of Cr(VI). Accordingly, the surface positive charges controlled by the Ti3+ defects play important roles in the photocatalytic reduction of Cr(VI).

引用

页码：203 / 208

页数：6

共 65 条

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