Nano Archive

Improving the visible light photocatalytic activity of nano-sized titanium dioxide via the synergistic effects between sulfur doping and sulfation

Niu, Yuxiao and Xing, Mingyang and Tian, Baozhu and Zhang, Jinlong (2012) Improving the visible light photocatalytic activity of nano-sized titanium dioxide via the synergistic effects between sulfur doping and sulfation. ScienceDirect, 115 . pp. 253-260. ISSN 0926-3373

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Abstract

S-doped and sulfated nano-sized TiO2 photocatalysts were prepared by a low-temperature solvothermal method, using potassium persulfate as sulfur source. The obtained samples were characterized by XRD, UV-vis DRS, FTIR, FTIR-pyridine, XPS, and nitrogen adsorption-desorption methods. Compared with undoped TiO2, the S-doped and sulfated TiO2 photocatalysts exhibited much higher photocatalytic activity for phenol degradation under visible light irradiation. It was revealed that S was not only incorporated into the crystal lattice of TiO2 replacing Ti4+ (as S4+) but also anchored on its surface in the form of SO42-. Further study indicated that there are synergistic effects between doped S and anchored SO42- on improving the visible light photocatalytic activity of TiO2. The doped S can form an impurity level below the conduction band of TiO2, extending the light response of TiO2 into visible light region, while SO42- anchored on TiO2 surface is favorable for trapping photo-induced electrons, suppressing the recombination of electrons and holes and consequently promoting the formation of hydroxyl radical.

Item Type:Article
Subjects:Engineering > Nanotechnology applications in mechanical engineering
Material Science > Nanochemistry
ID Code:11885
Deposited By:CSMNT
Deposited On:02 Sep 2012 13:16
Last Modified:02 Sep 2012 13:17

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