微波辅助制备纳米ZnO及其光催化降解染料的性能  

Photocatalytic degradation of dyes by nano-ZnO prepared with microwave assistance

作　　者：宋振宇[1] 童张法[1] 张寒冰[1,2] 陶靖鹏 覃岳隆 张蕾[2] 

机构地区：[1]广西大学化学化工学院广西石化资源加工及过程强化技术重点实验室,广西南宁530004 [2]广西大学环境学院,广西南宁530004

出　　处：《化工进展》2015年第12期4310-4314,共5页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(21166004);广西石化资源加工及过程强化技术重点实验室主任课题(2013Z004);广西大学博士启动科学基金(XBZ120056)项目

摘　　要：以硝酸锌、氢氧化钠为原料,聚乙二醇400(PEG 400)为溶剂,采用微波加热共沉淀法制备纳米Zn O,并采用X射线衍射、场发射电镜及紫外-可见漫反射对样品进行表征;考察纳米Zn O对结晶紫(CV)及刚果红(CR)的光催化降解性能,以λ=365nm的紫外光为光源,考察了催化剂投加量、染液浓度、p H值以及催化时间对催化效率的影响。实验结果表明,在较少的投加量下,纳米Zn O对50mg/L的CV和CR染液的降解率可分别达到98.8%和97.4%,p H值对两种染料的光催化效果影响不大。CR及CV染液的光催化降解均符合一级动力学。Zn O nanoparticles were prepared by microwave-assisted precipitation method using zinc nitrate and sodium hydroxide as raw materials and polyethylene glycol-400 as solvent. The prepared samples were characterized by means of XRD,FE-SEM and UV-Vis absorption spectra,respectively. The photocatalytic performance of nano-Zn O was carried out by degrading crystal violet and Congo red under UV light（λ=365nm） irradiation. Catalyst dosage,dyes concentration,p H value and reaction time were investigated to make clear how the parameters influenced the photocatalytic performance of nano-Zn O. The results show that the degradation efficiency of 50mg/L CV and CR could reach 98.8% and 97.4%,respectively. The p H value has little impact on dyes photocatalysis degradation and the degradation of CV and CR fit the first-order kinetic process.

关 键 词：纳米材料 氧化锌 聚乙二醇400 微波 催化 废水 结晶紫 刚果红 

分 类 号：O643[理学—物理化学]