ZnO微球的制备及表征  

Preparation and Characterization of ZnO Microspheres

作　　者：徐志兵[1] 陈金龙[1] 胡智东[1] 

机构地区：[1]安庆师范学院化学与环境科学学院,安徽安庆246003

出　　处：《石油化工》2007年第1期83-87,共5页Petrochemical Technology

基　　金：安徽省教育厅自然科学基金项目(2006kj024c);安庆市重点科技攻关课题(2006-11-06)

摘　　要：以Zn(NO3)2为原料、强酸型阳离子树脂为模板,制备了ZnO微球。采用热重-示差扫描量热、X射线粉末衍射、傅里叶变换红外光谱、紫外-可见光谱、扫描电子显微镜、氮气吸附等方法对试样进行了表征。表征结果表明,ZnO微球由纳米ZnO晶粒组成,球体直径200～600μm。当焙烧温度为580℃时,ZnO微球表面ZnO晶粒结合紧密,比表面积为24.72m2/g;当焙烧温度升至780℃后,ZnO微球则变得较为松散,比表面积下降为7.92m2/g。以300W高压汞灯为光源,以甲基橙溶液为模型考察了ZnO微球的光催化降解性能。实验结果表明,焙烧温度为580℃时,合成的ZnO微球具有很好的光催化性能,当ZnO微球加入量为400mg/L时,反应50min后,对10mg/L甲基橙溶液的降解率达97%。ZnO microspheres were prepared by ion exchange process with cation resin as template and characterized by means of TG-DSC, XRD, FTIR, UV-Vis, SEM and N2 adsorption. The microspheres are aggregated from ZnO nano-grains and are 200 - 600μm in diameter. When being calcinated at 580℃, ZnO nano-grains gather close on surface of microspheres with a specific surface area of 24.72 m2/g. When being calcinated at 780℃ ,the ZnO nano-grains on surfaces of microspheres become loosely attached and specific surface area is 7. 92 m2/g. Photocatalytic activity of ZnO microspheres in degradation of methyl orange under a 300 W high pressure mercury lamp was investigated. ZnO microspheres prepared at calcination temperature of 580℃ show very high photocatalytic activity. Under conditions of irradiation time 50 min, concentration of methyl orange solution 10 mg/L and ZnO microsphere dosage 400 mg/L, degradation rate of methyl orange can reach 97%.

关 键 词：氧化锌 微球 阳离子树脂 甲基橙 催化剂 光催化 降解 

分 类 号：TQ132.41[化学工程—无机化工]