石墨烯—超支化聚乙烯亚胺凝胶制备及对银离子的吸附性能研究  

Preparation of Graphene-Hyperbranched Polyethyleneimine Gel and Its Adsorption Properties for Silver Ions

作　　者：朱晨雪 刘训恿[1] 刘军深[1] 高学珍[1] 戴雨晴 夏云霞 刘毅[1] 

机构地区：[1]鲁东大学化学与材料科学学院,山东烟台264039

出　　处：《鲁东大学学报（自然科学版）》2018年第1期69-74,共6页Journal of Ludong University:Natural Science Edition

基　　金：国家自然科学基金(51403097)

摘　　要：氧化石墨烯(GO)与超支化聚乙烯亚胺(HPEI)通过交联反应制备了GO-HPEI凝胶.该凝胶可用于去除或者回收水中的银离子.考察了Ag^+浓度、温度以及溶液pH值等因素对凝胶吸附性能的影响.实验表明:在温度为25℃,溶液pH值为5.8的条件下,GO-HPEI凝胶对Ag^+的最大吸附量可达260 mg·g^(-1).同时,Ag^+浓度对凝胶的吸附性能有较大的影响,随着Ag^+浓度升高,GO-HPEI对Ag^+的吸附量变大.GO-HPEI凝胶对Ag^+的吸附过程遵循拟二级动力学方程,其吸附热力学符合Langmuir等温线模型.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.

关 键 词：氧化石墨烯 超支化聚乙烯亚胺 吸附量 银离子 

分 类 号：O631.2[理学—高分子化学]