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《Journal of Changzhou University(Natural Science Edition)》 2016-06
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Preparation and Cu~(2+) Ion Adsorption Studies of Chitin/Montmorillonite Composite Microspheres

YANG Jianhong;DING Yuanyuan;SUN Xiaojun;LIU Wanghui;CHEN Jungang;School of Environment and Safety Engineering,Changzhou University;  
Chitin/montmorillonite(CT/MMT)composite microspheres were prepared by blending MMT and chitin solution obtained via a freezing/thawing method in 8% NaOH/4% CO(NH_2)_2 aqueous solution,and then by coagulating with 10%HCl.Their structure and morphology were characterized by FT-IR,XRD,SEM and TEM techniques.These microspheres were studied for the removal of Cu~(2+)ions from the aqueous solution.The results showed that the composite microspheres exhibited efficient removal of Cu~(2+)ions from aqueous solution.Their adsorption capacity could reach about 19mg/g in 5mg/L of Cu~(2+)aqueous solution.The adsorption amount of Cu~(2+)ion on the composite microspheres increased with the increase of MMT amount and pH.In addition,the type of salt ions in aqueous solution was an important influence factor,too.The adsorption process was well explained with the pseudo-second-order kinetic equation and Freundlich adsorption isotherms.The major mechanism of the adsorption could be described as multi-interactions including electrostatic attraction,and metal chelation and ionic exchange.Adsorption of heavy metal ions by the CT/MMT microspheres had a good selectivity.The amount of different heavy metal ions adsorbed onto the composite microspheres was in the order of Pb~(2+),Cu~(2+),Ni ~(2+)from high to low.
【Fund】: 常州市科技支撑计划(社会发展)(CE20125036)
【CateGory Index】: O647.3;X703
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