纳米ZnO的制备及其热力学和催化动力学性质  

Preparation, the rmodynamic and catalytic kinetic properties of nano Zinc oxide

作　　者：李慧智 陶海珊 李言博 沈海云[1] 马骁飞[1] 朱莉娜[1] LI Hui-zhi;TAO Hai-shan;LI Yan-bo;SHEN Hai-yun;MA Xiao-fei;ZHU Li-na(College of Science,National Demonstration Center for Experimental Chemistry&Chemical Engineering Education,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学理学院化学化工实验教学中心

出　　处：《实验室科学》2019年第4期19-23,共5页Laboratory Science

基　　金：天津大学本科实验教学改革与研究项目(项目编号:2016-16)

摘　　要：利用溶胶-凝胶法制备出纳米ZnO,通过丁达尔现象、XRD、SEM、谢乐公式对样品进行了结构表征;分别测定了自制纳米ZnO、普通ZnO、市售纳米ZnO与盐酸的摩尔反应焓,求得三种ZnO的25℃的标准摩尔生成焓;利用分光光度法研究上述三种不同微观尺寸ZnO样品对酸性红水溶液的超声催化降解反应的动力学。实验结果表明,材料的尺度和结构对其性质有显著的影响。本实验以纳米氧化锌为主线,内容涉及纳米材料的制备与表征、热力学和动力学实验,可作为一个基础性和研究性兼具的物理化学综合性新实验。Nano-sized Zinc oxide was prepared by sol-gel synthetic method and its structure has been characterized by Scanning Electron Microscopy(SEM),and X-ray Diffraction(XRD),Tyndall effect and Scherrer formula.The standard molar enthalpies of formation of the synthetic nano ZnO,commercial nano ZnO and bulk ZnO samples were obtained by measuring the reaction enthalpies of ZnO with hydrochloric acid.The degradation of Acid Red aqueous solution in the presence of the three kinds of ZnO samples,respectively,under ultrasonic irradiation has been detected by UV-vis spectra and the catalytic kinetic properties has also been studied.The thermodynamic and kinetic properties of the three kinds of ZnO samples have been compared with their microstructure sizes.The theories and technics of this experiment are involving nanoscience,thermodynamic,and kinetic.This experiment can be designed as a new comprehensive and feasible experiment for undergraduates.

关 键 词：纳米氧化锌 溶胶-凝胶法 结构表征 热力学 催化动力学 

分 类 号：O64[理学—物理化学] G64[理学—化学]