Characterization of photoreduced View the MathML source and decomposition of dichloroacetic acid over photoreduced View the MathML source catalysts

The effect of photoreduction on the properties of View the MathML source catalysts was investigated. A decrease of the white-line area in the XANES spectra of View the MathML source catalysts at the Pt LIII edge was observed with increasing photoreduction time, which denoted the photoreduction of View the MathML source with UV illumination. From the EXAFS fitting results, the growth of Pt particles with the photoreduction time could be monitored. The XPS spectra of View the MathML source catalysts at the View the MathML source and View the MathML source bands showed the presence of Pt0 and Pt2+ states after photoreduction and the fraction of metallic Pt0 was increased with increasing photoreduction time. The optimum photoreduction time for DCA (dichloroacetic acid) decomposition was 6 h. The partially reduced state of Pt seems to be effective to obtain a high quantum yield in DCA decomposition with minimizing the agglomeration of Pt clusters on the TiO2 surface.