期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 206, 期 -, 页码 293-299出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2017.01.044
关键词
Photocatalysis; Titanium dioxide; Hydroxyl modification; Hexavalent chromium reduction
资金
- National Natural Science Foundation of China [21237003, 21407106, 21522703, 21377088]
- 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 and Shuguang Research Program of Shanghai Education Committee
The selective adsorption of hexavalent chromium (Cr2O72-(Cr(VI))) and the desorption of trivalent chromium (Cr3+(Cr(III))) at the surface of photocatalysts are very important factors in determining the photocatalytic reduction activity of Cr(VI). Here, a homogeneous anchoring of hydroxyl groups on TiO2 was achieved via a simple soaking method in alkaline solution. The increase of surface hydroxyl groups was confirmed by X-ray photoelectron spectroscopy (XPS) and Fourier transformed infrared spectra (FTIR). Moreover, the zeta potential analysis revealed the positive charged TiO2 surface in the acid system shown a significant improvement. The surface positive charges had the selective adsorption for Cr(VI) and desorption for Cr(III). Further experimental results revealed that such selective adsorption process played important roles in the photocatalytic reduction of Cr(VI). Finally, a process of selective adsorption/desorption promoted photocatalytic reduction of Cr(IV) was proposed in detail. (C) 2017 Elsevier B.V. All rights reserved.
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