Preparation and photocatalytic kinetics of nano-ZnO powders by precipitation stripping process

作     者：Dongxiang ZHANG Hang XU Min XUE Wenguo XU V TARASOV 

作者机构：School of Chemical Engineering and the EnvironmentBeijing Institute of TechnologyBeijing 100081China School of ScienceBeijing Institute of TechnologyBeijing 100081China D.I.Mendeleyev University of Chemical Technology of Russia125190 MoscowRussia 

出 版 物：《Frontiers of Chemical Science and Engineering》 (化学科学与工程前沿（英文版）)

年 卷 期：2008年第2卷第3期

页      面：319-324页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.20476010). 

主　　题：precipitation stripping method ZnO photocatalysis kinetics 

摘      要：Ultra-fine zinc oxalate powders were prepared through a precipitation stripping method with bis(2-ethylhexyl)phosphate(HDEHP)diluted by tetrachloride carbon as the extractant,and oxalic acid ethanol aqueous solution as the re-extractant and precipitator.Zinc oxide powders were obtained by decomposing zinc oxalate powders at 450℃.The prepared zinc oxide powders were characterized by transmission electron microscope(TEM),Scanning electron microscope(SEM),Thermogravimetric analysis(TG),X-ray diffraction(XRD)and Fourier transmission infrared(FT-IR)spectrum.The photocatalytic performance of methylene blue by zinc oxide was studied based on the Langmuir model and Photo-Layer model.The results show that some zinc oxide powders were micro-multipore materials with hexagonal crystal.The particle size was around 32 nm.The photocatalytic process was the control step in the chemical reaction.The photo catalytic process followed pseudo-first order kinetics and NOH concentration inside the photo-layer in different reaction condition were calculated according to the Photo-Layer model.