钴掺杂Bi_2O_3的制备及其可见光催化降解孔雀石绿废水的研究  

Preparation of Co-Bi_2O_3 Catalyst and its Visible-light Photocatalytic Degradation of Malachite Green

作　　者：王新智[1] 杨迎春[1] 屈静[1] 

机构地区：[1]成都信息工程大学资源环境学院,四川成都610225

出　　处：《成都信息工程大学学报》2016年第6期665-670,共6页Journal of Chengdu University of Information Technology

基　　金：国家自然科学基金资助项目(21106009);四川省教育厅科研计划资助项目(14TD0020)

摘　　要：采用共沉淀法制备钴掺杂Bi2O3光催化剂,用X射线衍射及固体紫外可见漫反射对其进行表征。研究孔雀石绿废水脱色率及化学需氧量去除率的影响因素,催化剂的重复使用性及反应动力学。结果表明,Co-Bi2O3形成了稳定的晶体结构,光吸收边带延伸至650 nm以上;Co/Bi=10%,投加量为1.25 g/L,5 mg/L的模拟废水,反应90 min后的脱色率达92.7%,4 h后化学需氧量去除率达92.9%,循环使用5次以后脱色率仍在80%以上;材料光催化降解550 mg/L范围内的孔雀石绿废水遵循一级反应动力学。材料对孔雀石绿染料废水的处理有很大应用价值。Co-Bi2O3 composite photocatalyst was prepared by co-precipitation method and was characterized by XRD and UV-Vis DRS. The effects on the photocatalytic decoloration rate and chemical oxygen demand removal rate of malachite green were studied. Properties of the catalyst for repeated use and reaction dynamics for degradation malachite green were investigated. The results showed that the crystal structure of Co-Bi2O3 was stable and the absorption edge shifted to more than 650 nm. The decoloration rate of malachite green（ 5 mg/L） was 92.7 % after being treatedchemical reaction for90 min under visible-light irradiation using 1.25 g/L Co-Bi2O3（ Co/Bi = 10 %） as the photocatalyst,and chemical oxygen demand removal rate of malachite green was 92.9 % after 4h. The activity of the catalyst remained above 80 % after5 times repeated use. The degradation process obeys the eule of the first-order kinetic reaction with the malachite green concentration range of 5-50 mg/L. Co-Bi2O3 has great application value in the treatment of malachite green wastewater.

关 键 词：水污染控制 染料废水 BI2O3 光催化 孔雀石绿 动力学 

分 类 号：X52[环境科学与工程—环境工程]