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采用溶胶-凝胶法制备TiO_2-SiO_2,用浸渍法将H_2PW_(12)O_(40)负载在TiO_2-SiO_2上,制得H_3PW_(12)O_(40)/TiO_2-SiO_2光催化剂。探究在模拟自然光条件下,光照时间、甲基红溶液初始浓度、催化剂用量和溶液pH对甲基红可见光催化降解的的影响。实验结果显示,在光照时间为15min.甲基红溶液初始浓度为15mg/L.催化剂用量为1.8g/L以及pH为2的优化条件下,甲基红的光降解率高达99.7%。光催化降解甲基红溶液为一级动力学反应。
TiO_2-SiO_2 was prepared by sol-gel method and H_ (3) PW_ (12) O_ (40) / TiO_2-SiO_2 photocatalyst was prepared by impregnating H_2PW_ (12) O_ (40) onto TiO_2-SiO_2 by impregnation method. The effects of light time, the initial concentration of methyl red solution, the amount of catalyst and pH on the photocatalytic degradation of methyl red were investigated under simulated natural light conditions. The experimental results showed that the photodegradation rate of methyl red was as high as 99.7% under the optimal conditions of 15 min illumination time, initial concentration of methyl red solution of 15 mg / L. Catalyst dosage of 1.8 g / L and pH of 2. Photocatalytic degradation of methyl red solution as a first-order kinetic reaction.