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TiO_2-assisted photo-catalysis degradation process of dye chemicals

Journal of Environmental Sciences 2001年第1期13卷 64-68页

作者： LI Fang\|bai 1,2 , GU Guo\|bang\+2, HUANG Guo\|feng\+1, GU Yun\|li\+2, WAN Hong\|fu\+1 (1.Guangdong Institute of Eco\|Environment and Soil Science,Guangzhou 510650, China. E\|mail: fbli@*** 2.College of Chemical Engineering, South Technolog Guangdong Institute of Eco-Environment and Soil Science Guangzhou 510650 China. E-mail:[email protected] College of Chemical Engineering South Technology University Guangzhou510642 China

The photo-catalytic degradation pathway and degradation products of methylene blue, rhodamine B, methyl orange, and malachite green in aqueous TiO2 suspension irradiated by high pressure mercury lamp by means of UV-visible absorption spectra and ion chromatography were investigated. The photo-catalysis degradation of dye solutions with charges was greatly effected by ph value owing to the electrostatic model. The photo-degradation rate of dyes anion increased with the decrease of ph value, in contrast, the photo-degradation rate of dyes cation increased with the increase of ph value. And the absorption peaks diminished with a blue shift. After illuminated for 30 minutes, a part of dye chemicals were completely mineralized and transferred into inorganic species including chloride ion, ammonium ion, nitrate ion, sulfate ion. And the addition of 100 mmol/L H2O2 promoted the formation of inorganic species. In this study, the quantity of ammonium ion was much more than that of nitrate ion. That indicated the formation of nitrate is from ammonium. The purification rate of COD in four kinds of dye solution was 71.7%-88.7%. The decrease of COD of dyes solution implies the feasibility of the environmental application of photo-catalyzed process.

关键词： Chromatography Irradiation Mercury vapor lamps ph effects photocatalysis Spectrum analysis Titanium oxides

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Fischer–Tropsch synthesis on impregnated cobalt-based catalysts:New insights into the effect of impregnation solutions and ph value

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Journal of Energy Chemistry 2016年第6期25卷 994-1000页

作者： Chuang Xing Peipei Ai Peipei Zhang Xinhua Gao Ruiqin Yang Noriyuki Yamane Jian Sun Prasert Reubroycharoen Noritatsu Tsubaki School of Biological and Chemical Engineering Zhejiang University of Science and Technology Department of Applied Chemistry Graduate School of Engineering University of Toyama Advanced Technology Research 20-1 Laboratories Nippon Steel & Sumitomo Metal Corporation Dalian National Laboratory for Clean Energy (DNL) Dalian Institute of Chemical Physics Chinese Academy of Sciences Department of Chemical Technology Faculty of Science Chulalongkorn University

The Co-based catalysts were prepared with different cobalt acetate solutions. effects of ph value were studied deeply on Fischer–Tropsch synthesis (FTS) through a semi-batch reactor. Among all impregnation solutions (water, butanol, amyl alcohol, acetic acid, nitric acid and ammonium nitrate), the catalyst prepared by NH4NO3solution showed the highest catalytic activity due to its small particle size and high reduction degree. However, the catalyst with the smallest particle size derived from water as impregnation solution exhibited low activity as well as high methane selectivity since it was difficult to be reduced and inactive in FTS. According to FT-IR spectra results, the low intensity of absorbed CO on the catalyst prepared from water solution resulted in low FTS activity. Whereas, the high activity of catalysts prepared from NH4NO3solution could be explained by the high intensity of absorbed CO on the catalysts. The cobalt species on the catalysts prepared under lower ph conditions exhibited smaller particle size distribution as well as lower CO conversion than those prepared at higher ph value. ? 2016 Science Press

关键词： Batch reactors Catalyst selectivity Catalysts Cobalt Impregnation Particle size Particle size analysis ph ph effects

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