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Catalysts 2013, 3(2), 363-377; doi:10.3390/catal3020363

Visible Light-Photocatalytic Activity of Sulfate-Doped Titanium Dioxide Prepared by the Sol−Gel Method

1
Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
2
Nagano Prefectural Institute of Technology, 813-8 Shimonogo, Ueda, Nagano 386-1211, Japan
*
Author to whom correspondence should be addressed.
Received: 19 February 2013 / Revised: 18 March 2013 / Accepted: 21 March 2013 / Published: 8 April 2013
(This article belongs to the Special Issue Photocatalysts)
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Abstract

Sulfate-doped TiO2 was prepared from sol−gel systems containing titaniumalkoxide and sulfuric acid. The time needed for gelation of the systems was significantlyreduced by ultrasonic irradiation. The doped sulfate was observed by FTIR and XPSmeasurements. Some sulfate ions remained in the TiO2 even after heating at 300−600 °C.The UV and visible photocatalytic activities of the samples were confirmed by thedegradation of trichloroethylene (TCE). The activity of the photocatalyst samples duringthe UV irradiation strongly depended on their crystallinities rather than their specificsurface areas, i.e., adsorption ability. The degradation rate during the visible irradiationdepended on both the adsorption ability and visible absorption of the photocatalystsamples. The visible absorption induced by the sulfate-doping was effective for theTCE degradation.
Keywords: titanium dioxide; sulfate doping; sulfuric acid; ultrasonic irradiation; photocatalyst titanium dioxide; sulfate doping; sulfuric acid; ultrasonic irradiation; photocatalyst
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Nishikiori, H.; Hayashibe, M.; Fujii, T. Visible Light-Photocatalytic Activity of Sulfate-Doped Titanium Dioxide Prepared by the Sol−Gel Method. Catalysts 2013, 3, 363-377.

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