微乳法制备的纳米Bi_2O_3对苯系物光催化活性  

Photocatalytic activities of Bi_2O_3 nanoparticles prepared by microemulsion method on benzene, toluene and xylene

作　　者：丁鹏[1] 杜尧国[1] 徐自力[1] 

机构地区：[1]吉林大学环境与资源学院环境科学系

出　　处：《吉林大学学报（理学版）》2004年第3期451-454,共4页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:20277015).

摘　　要：采用微乳法制备了Bi2O3纳米粒子,利用BET,XRD,XPS和UV VIS等手段对其表征;以挥发性有机物苯、甲苯和对二甲苯为气相污染物,测定了Bi2O3纳米微粒对它们的光化学催化氧化活性.结果表明:采用微乳法合成的光催化剂粒子晶型主要为四方型(T),粒子粒径为25 6～35 1nm,随着焙烧温度的升高晶型发生转变,固体表面电子结合能增大,光催化活性也相应提高.苯系物的降解速率顺序为:对二甲苯>甲苯>苯.(Bi_2O_3) nanoparticles were prepared by the microemulsion chemical method. The structureand properties of the as-prepared (Bi_2O_3) nanoparticles were studied by means of XRD, BET, XPS and UV-vis absorption spectrum. The photocatalytic oxidation reactions of benzene, toluene and xylene were used as model reaction to measure the photocatalytic activity of (Bi_2O_3) nanoparticles, respectively. The results show that the prepared crystals had a tetragonal structure. The size of (Bi_2O_3) nanoparticles was 25.6～35.1　nm. The structure of (Bi_2O_3) nanoparticles changes as the calcining temperature increases, and the electron conbining energy of the (Bi_2O_3) surface increases accordingly, at the same time, the photocatalytic activity for pollutants degradation is increased. The order of the degradation rates of aromatic hydrocar-bons is xylene>toluene>benzene.

关 键 词：微乳法 BI2O3 表征 光催化降解 

分 类 号：O643[理学—物理化学]