Journal
CHINESE JOURNAL OF CHEMISTRY
Volume 35, Issue 2, Pages 203-208Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.201600578
Keywords
Ti3+ modification; titanium dioxide; photocatalytic reduction; hexavalent chromium; surface selective adsorption and desorption
Categories
Funding
- National Natural Science Foundation of China [21407106, 21522703]
- Shanghai Government [14ZR1430800, 13SG44, 15520711300]
- International Joint Laboratory on Resource Chemistry (IJLRC)
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Shuguang Research Program of Shanghai Education Committee
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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).
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