Cr(VI) removal from aqueous solution with bamboo charcoal chemically modified by iron and cobalt with the assistance of microwave

查看全文 作　　者：Wei [1]Wang;Xuejiang [1]Wang;Xin [1]Wang;Lianzhen [1]Yang;Zhen [1]Wu;Siqing [1]Xia;Jianfu [1]Zhao

机构地区：[1]State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University

出　　处：《Journal of Environmental Sciences》索引2013年第25卷第9期,共10页

基　　金：supported by the National High Technology Research and Development Program (863) of China (No. 2012AA063608);the Major National S&T Program of China (No. 2011ZX07303-001) 摘　　要：Bamboo charcoal (BC) was used as starting material to prepare Co-Fe binary oxideloaded adsorbent (Co-Fe-MBC) through its impregnation in Co(NO3)2 , FeCl3 and HNO3 solutions simultaneously, followed by microwave heating. The low-cost composite was characterized and used as an adsorbent for Cr(VI) removal from water. The results showed that a cobalt and iron binary oxide (CoFe2O4 ) was uniformly formed on the BC through redox reactions. The composite exhibited higher surface area (331 m2/g) than that of BC or BC loaded with Fe alone (Fe-MBC). The adsorption of Cr(VI) strongly depended on solution pH, temperature and ionic strength. The adsorption isotherms followed the Langmuir isotherm model well, and the maximum adsorption capacities for Cr(VI) at 288 K and pH 5.0 were 35.7 and 51.7 mg/g for Fe-MBC and Co-Fe-MBC, respectively. The adsorption processes were well fitted by the pseudo second-order kinetic model. Thermodynamic parameters showed that the adsorption of Cr(VI) onto both adsorbents was feasible, spontaneous, and exothermic under the studied conditions. The spent Co-Fe-MBC could be readily regenerated for reuse. 关键词：CR(VI) 铁酸钴水溶液除铁化学修饰微波辅助竹炭 LANGMUIR吸附

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Cr(VI) removal from aqueous solution with bamboo charcoal chemically modified by iron and cobalt with the assistance of microwave

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