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《Journal of Ludong University(Natural Science Edition)》 2018-01
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Preparation of Graphene-Hyperbranched Polyethyleneimine Gel and Its Adsorption Properties for Silver Ions

ZHU Chenxue;LIU Xunyong;LIU Junshen;GAO Xuezhen;DAI Yuqing;XIA Yunxia;LIU Yi;School of Chemistry and Materials Science,Ludong University;  
GO-HPEI gel was prepared by a cross-linking reaction of graphene oxide( GO) with hyperbranched polyethylenimine( HPEI). The GO-HPEI gel,as an adsorbent material,was used to remove silver ion( Ag~+)from wastewater. Many different affecting factors for adsorption capacity of Ag~+onto GO-HPEI gel,such as the GO-HPEI gel concentration,temperature and pH value,were investigated. The experimental results showed that the maximum adsorption capacity of GO-HPEI gel for Ag~+was as high as 260 mg·g~(-1) at pH 5.8 under 25℃. And the concentration of silver ion also had a greater influence on the adsorption capacity of gel,i. e. the higher the concentration of silver ion was,the higher the adsorption capacity of gel was. In addition,adsorption experiments demonstrated that the adsorption kinetic and equilibrium data agreed well with the pseudo-second-order and Langmuir isotherm models in the process of Ag~+process. Thus,the GO-HPEI gel,as a new adsorbent with high adsorption capacity,could have a potential application in the removal of Ag~+from wastewater.
【Fund】: 国家自然科学基金(51403097)
【CateGory Index】: O647.3;O648.17
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