复合氧化物TiO_2/Bi_2O_3对甲苯的光催化作用  

Photocatalytic research of TiO_2/Bi_2O_3 composite catalysts on oxidation of toluene

作　　者：丁鹏[1] 贾欣茹[1] 唐艳茹[2] 杜尧国[3] 徐自力[3] 

机构地区：[1]北京大学化学与分子工程学院 [2]长春师范学院化学学院,吉林长春130032 [3]吉林大学环境与资源学院,吉林长春130023

出　　处：《功能材料》2007年第9期1468-1470,共3页Journal of Functional Materials

基　　金：国家自然基金项目资助项目(20277015)

摘　　要：采用NaOH沉淀法制备了TiO2/Bi2O3纳米粒子,用TG-DTA、UV-vis、XRD、XPS等对其结构、性质进行表征,并以甲苯为气相有机污染物对TiO2/Bi2O3光化学催化剂的气-固复相反应活性进行了研究。发现TiO2的加入可以阻碍Bi2O3晶粒的生长,从而导致粒径的减小。光生电子产生于Bi2O3并迁移到TiO2表面,使所需的激发光频率变低,从而使半导体的吸光波长向可见光区域扩展,表明复合TiO2能够提高Bi2O3的光催化活性,并且活性的提高程度与n(Ti)∶n(Bi)有关,其最佳配比为0.03∶1;光催化活性随焙烧温度升高而增大,750℃焙烧的样品光催化活性最好。TiO2/Bi2O3 nanoparticles was prepared via NaOH precipitation method, and the structure and surface properties of the as-prepared TiO2/Bi2O3 were characterized by means of TG-DTA, UV-vis, XRD and XPS. Furthermore, their photoactivity was evaluated by gas-phase heterogeneous photooxidation of toluene. We found the introduction of TiO2 can suppress the growth of Bi2O3 crystallites, and thus obtain relatively small crystalline size. Most importantly, the absorption edge of TiOz/Bi2O3 is greatly shifted to the visible-light region. All the experiment results reveal mixing Bi2O3 with TiO2 enable to enhance the photoactivity. The increasing level of photocatalytic activity is related to the ratio of n（Ti） ：n（Bi） and the best ratio is 0.03 ： 1. With the calcining temperature increasing, the photocatalytic activity is increased, and the best calcining temperature is 750℃.

关 键 词：TiO2/Bi2O3 表征 甲苯 光催化 

分 类 号：O643[理学—物理化学]