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
收藏
页码：203 / 208
页数：6
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