乙二胺硅胶复合材料对Zn^(2+)的吸附特性  

The Adsorption of Zn^(2+) Cations on Ethylenediamine-grafted Silica Gel

作　　者：范忠雷[1] 王玲慧[1] 慎金鸽[1] 

机构地区：[1]郑州大学化工与能源学院,郑州450001

出　　处：《应用化学》2010年第11期1260-1264,共5页Chinese Journal of Applied Chemistry

基　　金：郑州大学引进人才项目;郑州大学研究生教育支持基金

摘　　要：以γ-氯丙基三氯硅烷为偶联剂,将乙二胺偶合接枝在硅胶表面,合成对锌离子具有吸附作用的乙二胺硅胶复合材料(EDA/SiO2),考察了Zn2+溶液pH值、初始浓度、吸附温度和吸附时间等因素对复合材料吸附性能的影响。结果表明,在研究的溶液浓度及温度范围内,Zn2+溶液pH值对EDA/SiO2的吸附量影响显著,吸附的最佳pH值范围在3.0～5.5;Zn2+的吸附平衡数据符合Langmuir吸附模型,热力学数据显示,EDA/SiO2对Zn2+的吸附行为为一吸热且自发进行的过程,升高温度有利于吸附,并对此吸附行为作了解释;吸附动力学数据可用拟二级吸附动力学方程描述,得到的吸附速率常数与溶液初始浓度有关。Ethylenediamine-grafted silica gel materials（EDA/SiO2） for the adsorption of Zn2＋ were prepared with the use of γ-chloropropyltrichlorosilane as coupling reagent and ethylenediamine as a surface-modifying reagent.The adsorption behavior of EDA/SiO2 for Zn2＋ and the effects of pH in Zn2＋ solution,initial concentration,adsorption temperature and time were studied.The experimental results show that the pH value of Zn2＋ solution affected the adsorption capacity of EDA/SiO2 significantly,and the suitable pH range was pH 3.0 ～ 5.5 for the adsorption of Zn2＋.The adsorption equilibrium data for Zn2＋ could be fitted according to the Langmuir model.The results of the thermodynamic parameters of the adsorption of Zn2＋ on EDA/SiO2 show that this adsorption is an endothermic spontaneous process and increasing temperature is conducive to the adsorption.An interpretation was given for this,adsorption behavior of Zn2＋ on EDA/SiO2.Adsorption kinetic data could be fitted by the pseudo-second-order kinetic equation,and the fitting kinetic constants were related with the initial solution concentration.

关 键 词：EDA/SiO2 吸附 Zn2+ 

分 类 号：O647.3[理学—物理化学]