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Preparation and Properties of the Heteropolyoxometalates of Large Organic Cation with Molybdotungstosilicic Acids

Journal of Wuhan University of Technology(Materials Science) 2008年第2期23卷 198-203页

作者： WANG Dunjia FANG Zhengdong WEI Xianhong Hubei Key Laboratory of Bioanalytical Technique Department of Chemistry and Environmental Engineering Hubei Normal University Huangshi 435002 China

Some new heteropolyoxometalates of large organic cations with molybdotungstosilicic acids （general formula：（CTMA）4SiMoxW12-xO40·mH2O·nDMF, x=0,2,4,6,8,10,12） were prepared by the reaction of cetyltrimethylammonium bromide （CTMAB,C16H33N（CH3）3Br） with H4SiMoxW12-xO40（x=0,2,4,6,8,10,12） in aqueous solution and recrystallization in DMF, and characterized by elemental analysis, ir spectra,TG- DTA and XRD techniques. The ir spectrum confirms the presence of Keggin structure and organic cations in these compounds, and it is indicated that the stretching vibration of the M-Od, M-Ob-M and Si-Oa becomes more red-shifted when molybdenum is gradually substituted for the tungsten atom. In particular, the thermal decomposition of the heteropolyoxometalates was studied in nitrogen atmosphere. The TG-DTA curves show that their thermal behaviors not only contain the release of water molecule, DMF molecule, CTMA and its fragments but also contains simultaneous collapse of Keggin anion. Their end products of the thermal decomposition are the mixture of WO3, MoO3 and SiO2. And from the final decomposition temperature of view, it is found that the thermal stability of these compounds gradually is decreased when the number of molybdenum atoms is increased.

关键词： heteropolyoxometalates molybdotungstosilicic acid cetyltrimethylammonium bromide ir spectral and thermal study

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Removal of Pollutants of Landfill Leachate by Recirculation

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Journal of Wuhan University of Technology(Materials Science) 2008年第2期23卷 281-284页

作者： LI Ye WANG Lina ZHENG Shizhong School of Resources and Environmental Engineering Wuhan University of Technology Wuhan 430070 China The Landfill of Hongmiaoling in Fuzhou City

SAfter leached from municipal solid waste landfill was treated by recirculation, the concentration of pollutants decreases greatly, and the moisture content of the solid waste in landfill site was increased and waste stabilization rate was accelerated. Compared with traditional treatment methods, this method offers more important practical values, including short investment, enhanced treatment efficiency and facilitated operation and management. The experimental results indicated that a 99.9% removal of ammonia nitrogen and an 80.5% removal of COD were obtained, when hydraulic power surface load is 15.92 L/m^2·d, and organic surface load is 25.54 g/m^2·d.

关键词： heteropolyoxometalates molybdotungstosilicic acid cetyltrimethylammonium bromide ir spectral and thermal study

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