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

Frontiers of Chemical Science and Engineering 2008年第3期2卷 319-324页

作者： Dongxiang ZHANG Hang XU Min XUE Wenguo XU V TARASOV School of Chemical Engineering and the Environment Beijing Institute of TechnologyBeijing 100081China School of Science Beijing Institute of TechnologyBeijing 100081China D.I.Mendeleyev University of Chemical Technology of Russia 125190 MoscowRussia

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.

关键词： precipitation stripping method ZnO photocatalysis kinetics

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