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

Paper ID Volume ID Publish Year Pages File Format Full-Text
46427 46439 2012 8 PDF Available
Title
Improving the visible light photocatalytic activity of nano-sized titanium dioxide via the synergistic effects between sulfur doping and sulfation
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.

Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► S doped and sulfated TiO2 photocatalysts were prepared by a low-temperature solvothermal method, with potassium persulfate as sulfur source. ► The S doped and sulfated TiO2 photocatalysts have high photocatalytic activity to phenol degradation. ► Sulfur can not only be doped into TiO2 lattice but also anchored on the surface. ► The high photocatalytic activity of phenol was caused by the synergistic effect between S doping and sulfation.

Keywords
Potassium persulfate; Synergistic action; Sulfur doping; SO42−; Phenol degradation
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Improving the visible light photocatalytic activity of nano-sized titanium dioxide via the synergistic effects between sulfur doping and sulfation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 115–116, 5 April 2012, Pages 253–260
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us