Bi_2O_3-WO_3光催化臭氧氧化降解糖蜜酒精废水的研究  

Photodegradation of Fermented Molasses Wastewater by Combined Bi_2O_3-WO_3 Catalysis and Ozonation Processes

作　　者：刘自力[1] 刘红梅[1] 

机构地区：[1]广西大学化学化工学院

出　　处：《分子催化》2007年第6期550-555,共6页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金资助课题(20466001);广西大学科学技术研究重点项目(2004ZD01);广州市属高校科技项目(62040).

摘　　要：采用固相合成法制备了Bi2O3-WO3光催化剂,研究了Bi2O3-WO3光催化与臭氧氧化协同降解糖蜜酒精废水的多相催化降解过程,并采用X射线衍射光谱(XRD)、紫外漫反射光谱(DRS)、热重-差热扫描(TG-DSC)等手段对Bi2O3-WO3催化剂进行了表征.研究发现:Bi2O3-WO3是一性能良好的光催化剂,臭氧强化了Bi2O3-WO3光催化氧化过程,反应2h后,糖蜜酒精废水的脱色率可达90.2%.Bi2O3-WO3光催化剂的禁带宽度为2.92eV,其中γ-Bi2WO6和Bi2W2O9是其活性中心.焙烧温度对Bi2O3-WO3光催化剂的活性有较大的影响,其中1073K为适宜的焙烧温度.Photodegradation of fermented molasses wastewater was studied by the method of combined Bi2 O3-WO3 catalysis and ozonation. The catalyst of Bi2O3-WO3 was synthesized by solid-state reaction. The structure of Bi2O3- WO3 was characterized by X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, TG-DSC curve. The results showed that Bi2 O3-WO3 photocatalysis and ozonation processes exhibited excellent activity in degradation of fermented molasses wastewater. After 120 minutes reaction, the decoloration rate of fermented molasses wastewater was 90.2%. Band-gap energy of Bi2O3-WO3 photocatalysts was 2.92 eV, and γ-Bi2WO6 and Bi2W2O9 was the catalytic centers of Bi2O3-WO3 photocatalysts. The calcinated temperature had a great effect on the activity of Bi2O3-WO3 photocatalysts. The suitable calcinated temperature was 1 073 K.

关 键 词：光催化 臭氧 降解 糖蜜酒精废水 Bi2O3-WO3 催化剂 

分 类 号：O643.3[理学—物理化学]