作　　者： ; ; ; ; ;

机构地区： 广东工业大学轻工化工学院

出　　处： 《环境科学与技术》 2009年第B06期8-11,共4页

摘　　要： 采用光电协同催化法降解甲苯气体，其中光电催化装置由两电极和固体电解质形成通路结构，光源由波长为253.7nm，功率为9W的紫外灯提供。对比了光电协同催化法、光催化法和电催化法对气相中甲苯的降解效果，考察了初始浓度、外加电压和相对湿度对降解甲苯效率的影响。结果表明：同等条件下，光电催化法降解甲苯的效率是光催化的1.79倍，是电催化的3.08倍，其反应速率常数是光催化与电催化的反应速率之和的1.94倍。当外加电压为3V、降饵时闻为80min，反应器中空气的相对湿度为60％、初始浓度〈476.25mg／m^3时，降解甲苯的效率达到79.51％。通过气相色谱分析降解产物，结果只有未降解的甲苯。 The system of photoelectrocatalysis is set which consisting of solid polymer electrolyte Nafion and electrode to study the degradation efficiency of toluene gas. The light source is UV lamp, which gives wavelength of 253.7nm with the power of 9W. Degradation of toluene in the gas phase by photoeatalysis, electrocatalysis and photoelectrocatalysis was studied in this paper. More over,the effects of the initial concentration, relative humidity and voltage were investigated. Under the same conditions, it was shown that the degradation efficiency of photoelectrocatalysis is 1.79 times as high as photocatalysis and 3.08 times higher than electrocatalysis, as well as, the rate constant of photoelectrocatalysis is 1.94 times big as sum of photocatalysis with electrocatalysis. High degradation efficiency is obtained when the voltage is 3V, reaction time is 80 min, the relative humidity is 62%, and the initial concentration is lower than 476.25mg/m^3. Further more, the gas chromatogram showed that the other volatile product was not been detected.

关 键 词： 光电催化 甲苯 固体电解质 活性碳纤维

领　　域： [环境科学与工程]