POMs/TiO2复合催化剂光催化降解有机污染物的研究

摘要

[目的]采用溶胶-凝胶方法制备了几种POMs/TiO2复合光催化剂,考察了催化剂在紫外光照射下对模拟染料废水(酸性媒介黑PV溶液)的光催化降解行为,为降解有机污染物提供理论指导.[方法]研究了催化剂中的POMs含量、催化剂用量、溶液的pH及H2O2浓度对PV溶液降解过程的影响.[结果]H4 SiW12O40/TiO2复合催化剂光催化降解模拟染料废水(PV溶液)效果最佳.PV溶液初始浓度为300 mg/L时,脱色反应最佳条件:催化剂为H4SiW12O40/TiO2,α-H4SiW12O40质量分数为1.5％时,催化剂用量为60mg、pH为2.0、H2O2浓度为20 mmol/L时,PV降解质量分数可达到72.48％.[结论]POMs/TiO2复合催化剂较纯TiO2光催化降解PV溶液活性明显,其光催化降解有机污染物意义重大.%[Objective] The aim is to investigate photocatalytic degradation of dye waste water ( Acid Mordant Black PV solution) under UV light irradiation using the composite of POMs/TiO2 as catalyst prepared by sel-gel method. The study can provide the theoretical guidance for degradation of organic pollutants. [ Method] The degradation of PV is affected by content of POMs in catalyst, amount of catalyst, pH, concentration of H2O2 solution . [ Result] The catalyst of H4SiW12O40/TiO2 has the best efficiency to the photocatalytic degradation of dye wastewater (PV solution). In 300 mg/L RUN solution, the optimum reaction condition is as follows. The amount of catalyst H4SiW12O40/TiO2 (α-H4SiW12O40 content: 1.5% ) is 60 mg, pH = 2.0, 20 mmol/L H2O2 solution. Under the above condition, the percentage of degradation for PV comes up to 72.48%. [ Conclusion] The photocatalytic activity of POMs/TiO2 catalyst is higher than that of TiO2. Photocatalytic degradation of organic pollutions by POMs/TiO2 catalyst has great significance.