in water byproducts: CH3COOH; Irradiation (UV/VIS); 30percent H2O2 diluted with deionized water, Zn(CH3COO)2*2H2O dissolved in it;soln. irradiated by 35 W xenon lamp or sunlight for 6 h with continuous stirring; precursol sol aged for 2 days; baked at 40 °C overnight; dried;