中文摘要：

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。

英文摘要：

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.