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篇目详细内容

【篇名】 Preparation and photocatalytic kinetics of nano-ZnO powders by precipitation stripping process
【刊名】 Frontiers of Chemical Engineering in China
【刊名缩写】 Front. Chem. Eng. China
【ISSN】 1673-7369
【EISSN】 1673-7474
【DOI】 10.1007/s11705-008-0051-y
【出版社】 Higher Education Press and Springer-Verlag
【出版年】 2008
【卷期】 2 卷3期
【页码】 319-324 页,共 6 页
【作者】 ZHANG Dongxiang; XU Hang; XUE Min; XU Wenguo; TARASOV V;
【关键词】 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°C. 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 •OH concentration inside the photo-layer in different reaction condition were calculated according to the Photo-Layer model.
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