H_2O_2处理H_3PW_6Mo_6O_(40)/ZrO_2-SiO_2光催化降解甲基橙

Photocatalytic degradation of methyl orange with H_3PW_6Mo_6O_(40)/ZrO_2-SiO_2 sensitized by H_2O_2

采用浸渍法制备了H_3PW_6Mo_6O_(40)/ZrO_2-SiO_2催化剂,用H_2O_2进行敏化处理,并通过FT-IR、XRD对其进行了表征。探讨了该催化剂对甲基橙溶液的催化降解活性,较系统地研究了溶液的初始浓度、溶液的pH、催化剂用量对光催化降解甲基橙的影响。研究发现:H_3PW_6Mo_6O_(40)/ZrO_2-SiO_2对甲基橙有良好的降解效果。在甲基橙溶液初始浓度为10mg·L^(-1),溶液pH为2.5,催化剂用量为溶液总质量0.5%的条件下光照2.5h,甲基橙的降解率达到91.1%。H_3PW_6Mo_6O_(40)/ZrO_2-SiO_2催化剂光催化降解甲基橙溶液为一级动力学反应。

H3PW6Mo6O40/ZrO2-SiO2was prepared by impregnation, sensitized by H202 solution, and characterized by FT-IR and XRD. The photocatalytic degradation of methyl orange by H3PW6Mo6O40/ZrO2-SiO2 undersimulated natural light irradiation was in-vestigated. The results demonstrated that at optimal condition （initial concentration of methyl orange is 10 mg·L- 1 , and the pH is 2. 5 , the dosage of catalyst is 0. 5% based on feed stocks） , the degradation rate of methyl orange is as high as 91. 1 % after 2. 5h sim-ulated natural light irradiation. The reaction of photocatalysis for methyl orange can be expressed as first-order kinetic model.