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Publication Detail
Enhanced photocatalytic activity of nc-TiO by promoting photogenerated electrons captured by the adsorbed oxygen
Nanocrystalline TiO (nc-TiO ) was modified by a simple post treatment with monometallic sodium orthophosphate solution. It is shown that the surface modification with an appropriate amount of phosphate obviously enhances the surface photovoltage responses of nc-TiO in the presence of O , clearly indicating that the separation of photogenerated charges is greatly improved by promoting the photoelectrons captured by the adsorbed O . This is well responsible for its much high photocatalytic activity for degrading representative gas-phase acetaldehyde, liquid-phase phenol and rhodamine B of phosphate-modified nc-TiO , compared with the unmodified nc-TiO . Moreover, it is demonstrated that the amount of O adsorbed on the surfaces of nc-TiO is greatly increased after phosphate modification based on the O temperature programmed desorption curves, which is attributed to the substitution of -Ti-OH with -Ti-O-P-OH. It is suggested for the first time that the phosphate modification favors the O adsorbed on TiO so as to further promote the photogenerated electrons captured. This work would provide feasible routes to further improve the photocatalytic performance for degrading pollutants of oxide-based semiconductors. This journal is © the Owner Societies 2012.
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