缺位Dawson型K10Na2H2P2W16O60光催化降解甲基橙溶液的研究

目的]确定缺位Dawson型K10Na2H2P2W16O60光催化降解甲基橙的最佳条件。方法]以二缺位杂多化合物K10Na2H2P2W16O60.18H2O（P2W16）为光催化剂,在紫外灯照射下对模拟染料废水中的甲基橙进行光催化降解,研究催化剂投加量、甲基橙初始浓度、pH值等对溶液脱色效果的影响。结果]催化剂用量为1.2g/L时溶液的脱色率最大,为96.22%;pH值为1.5时溶液的脱色率最大,为99.15%;甲基橙初始浓度为5mg/L时溶液的脱色率最大,为99.69%。P2W16光催化降解甲基橙的最佳条件为：甲基橙初始浓度5mg/L,溶液初始pH值1.5,催化剂浓度0.2g/L,此条件下反应1h后溶液的脱色率可达99.69%。同时,甲基橙的光催化降解过程符合一级动力学方程：In（A/A）=0.09391t-0.02286。结论]PW对甲基橙降解反应具有较高的催化活性。

Research on Photocatalytic Degradation of Methyl Orange Solution with Lacunary Dawson-type K10Na2H2P2W16O60

Objective] The purpose was to ascertain the optimum condition for photocatalytic degradation of methyl orange with lacunary Dawson-type K10Na2H2P2W16O60.Method] With di-vacancy heteropoly compounds K10Na2H2P2W16O60·18H2O(P2W16)as photocatalyst,the methyl orange in simulated waste water of dye was degraded by photocatalysis under irradiation of UV lamp for researching the influences of factors including addition amount of catalyst,initial concn.of methyl orange,pH value on decolorized effect of solution.Result] When the catalyst dose was 1.2 g/L,the decolorized rate of solution was highest,being 96.22%;when pH value was 1.5,the decolorized rate of solution was highest,being 99.15%;when the initial concn.of methyl orange was 5 mg/L,the decolorized rate of solution was highest,being 99.69%.The optimum condition for photocatalytic degradation of methyl orange with P2W16 was as follows:the initial concn.of methyl orange was 5 mg/L,the initial pH value of solution was 1.5 and the catalyst concn.was 0.2 g/L.Under this condition,the decolorized rate of solution could reach 99.69% after reaction for 1 h.Simultaneously,the photocatalytic degradation process of methyl orange accorded with first order kinetics equation:In(A0/A)=0.093 91t-0.022 86.Conclusion] P2W16 had higher catalytic activity on the degradation reaction of methyl orange.