TiO_2-Bi_2O_3纳米粒子气相光催化降解对二甲苯  

Gas-phase Photocatalytic Degradation of p-Xylene Using TiO_2-Bi_2O_3 Nano-particles

作　　者：丁鹏[1] 谢忠雷[2] 唐艳茹[1] 杜尧国[2] 

机构地区：[1]长春师范学院化学学院,吉林长春130032 [2]吉林大学环境与资源学院,吉林长春130023

出　　处：《化工环保》2012年第2期109-112,共4页Environmental Protection of Chemical Industry

基　　金：长春师范学院自然科学基金资助项目([2010]第006号);国家自然科学基金资助项目(21041007;20277015)

摘　　要：采用沉淀法制备了TiO2-Bi2O3纳米粒子,并对其进行结构表征。以制得的TiO2-Bi2O3为光催化剂,以对二甲苯为目标污染物,研究了对二甲苯气相光催化氧化降解的影响因素。实验结果表明:经750℃焙烧的光催化剂对对二甲苯的催化效果最好;随氧气加入量的增加,对二甲苯的降解率增大;少量水蒸气的加入,可增大对对二甲苯降解率;采用L-H动力学模型得到对二甲苯光催化降解的反应速率常数和吸附常数分别为0.089 5μmol/(L.min)和0.000 785 L/μmol。TiO2-Bi2O3 nano-particles were prepared by precipitation method,and their structures were characterized.Using the prepared TiO2-Bi2O3 as photocatalyst and p-xylene as target pollutant,the factors affecting the gas-phase photocatalytic oxidation were studied.The experimental results show that： The photocatalyst calcined at 750 ℃ has the best catalytic effect on p-xylene degradation;The p-xylene degradation rate can increase with the increasing of oxygen dosage and with the addition of a little quantity of water vapor;According to L-H kinetic model,the reaction rate constant and the adsorption constant for photocatalytic degradation of p-xylene are 0.089 5 μmol/（L.min） and 0.000 785 L/μmol respectively.

关 键 词：对二甲苯 二氧化钛 硝酸铋 光催化 动力学 废气处理 

分 类 号：X701.7[环境科学与工程—环境工程]