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Existing form of Mo(Ⅵ)in acidic sulfate solution

Rare Metals 2017年第7期36卷 612-616页

作者： Ming-Yu Wang Chang-Jun Jiang Xue-Wen Wang Peng-Fei Xian Hua-Guang Wang Yang Yang School of Metallurgy and Environment Central South UniversityChangsha 410083China

The existing form of molybdenum in acidic sulfate solution was studied by means of ion exchange, infrared （IR） spectra and X-ray photoelectron spectroscopy （XPS）. The results indicate that the anionic molybdenum species are predominant in acidic sulfate solution, and Mo（VI） can combine with sulfate radical to form heteropoly acid anions [Mo205（804）2]2- and [MoO2（HSO4）4]2-. With the decrease in solution pH from 1.92 to 0.06, the existing form of Mo（VI） changes from MovO21（OH）3^3- to [Mo205（S04）2]2- and then becomes [MoOz（HSO4）4]2-, which results in the decrease in the resin adsorption capacity for molybdenum.

关键词： Molybdenum Acidic sulfate solution ionexchange

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Removal of Zn2＋ from aqueous solution by biomass of Agaricus bisporus

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Frontiers of Environmental Science & Engineering 2013年第4期7卷 531-538页

作者： Feng XUE Beicheng XIA Rongrong YING Shili SHEN Peng ZHAO School of Environmental Science and Engineering Sun Yat-Sen University Guangzhou 510275 China Nanjing Institute of Environmental Sciences MEP Nanjing 210042 China

Abstract Biosorption of Zn2＋ from aqueous solutions by biomass of Agaricus bisporus was investigated. The removal rates of Zn2＋ by A. parameters （e.g., solution pH, initial Zn2＋ concentration） were A. bisporus＇s biosorption by bisporus under different bio-sorbent dosage and studied. The inhibition of anionic ligands EDTA （Ethylene Diamine Tetraacetic Acid）, acetate and citrate） implied that EDTA and citrate might be used as eluting reagents. Regular and simultaneous solution pH change and light metal ions release after biosorption indicated that an ion exchange mechanism was involved. From FT-IR （Fourier Transform Infrared） spectroscopy, the main functional groups participated in biosorption were found. Biosorption of Znz＋ byd. bisporus could be well described by the Freundlich and Langmuir models. In conclusion, the biomass of A. bisporus showed high potential for the treatment of wastewater containing Zn2＋.

关键词： biosorption Agaricus bisporus zinc ionexchange FT-1R isotherms

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Research on Bipolar Membrane Electrodialysis for Ion Exchange of Molecular Sieves

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China Petroleum Processing & Petrochemical Technology 2018年第2期20卷 1-5页

作者： Chen Beiyan Liu Zhongqing Zhou Lina Luo Yibin Shu Xingtian SINOPEC Science&Technology Department Beijing 100728 SINOPEC Research Institute of Petroleum Processing Beijing 100083

In view of the problems associated with large amount of discharged wastewater and serious pollution in the existing technology for removing sodium species from molecular sieves,this research work introduces the bipolar membrane electrodialysis into the process of removing sodium species from molecular sieves,and proposes a novel method of cleanly removing sodium from molecular *** results show that the technology for removing sodium ions from the molecular sieves with an indirect electrodialysis process is feasible,and can recover Na OH *** bipolar membrane electrodialysis is especially suitable for treating the USY,ZSM-5 and Beta molecular sieves with high acid-resistance,and the physicochemical properties and catalytic performance of the prepared molecular sieves are roughly equivalent to those of the ammonium ion-exchange *** comparison with the ammonium ion-exchange method,the process is clean and environmentally friendly,which consumes less water,and does not discharge wastewater to exhibit a rosy prospect of industrial application.

关键词： molecular sieve ionexchange bipolarmembrane electrodialysis

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