EFFECTS OF H- AND CH3COOH ON THE PHOTOCATALYTIC CONVERSION OF PTCL62-IN AQUEOUS TIO2 DISPERSION(, CL)

In this work, the effects of H+, Cl- and CH3COOH on the photocatalytic conversion of PtCl62- in an aqueous TiO2 dispersion were studied by m eans of X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), UV-visible diffus e reflectance spectroscopy and UV-visible absorption spectroscopy. The results obtained show that PtCl62-, in the form of its hydrolysis pro duct, is photocatalytically converted into a solid deposit on the TiO2 surface; the quantity and composition of the solid deposit vary with the degree of PtCl62- hydrolysis. When both H+ and Cl- concentrations are sufficiently high to depress the hydrolysis of PtCl62-, no deposit is observed on the TiO2 surface. The effect of CH3COOH on the composi tion of the photocatalytic product of PtCl62- on the TiO2 surface is c losely related to the degree of ionization of CH3COOH.