聚乙烯亚胺改性硅胶材料对Cu^(2+)的吸附动力学与热力学研究  

Kinetics and Thermodynamics of Polyethyleneimine-grafted Silica Gel for Cu2+

作　　者：刘海龙 张黎君 赵丹丹 赵扬 范忠雷[2] LIU Hai-long;ZHANG Li-jun;ZHAO Dan-dan;ZHAO Yang;FAN Zhong-lei(School of Chemical Engineering,Henan Technical Institute,Zhengzhou 450042,China;School of Chemical Engineering and Energy,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]河南应用技术职业学院,河南郑州450042 [2]郑州大学化工与能源学院,河南郑州450001

出　　处：《盐科学与化工》2022年第9期17-20,共4页Journal of Salt Science and Chemical Industry

基　　金：2022年度河南省高等学校重点科研项目(22B530002);2020年度河南应用技术职业学院青年骨干教师资助对象(2020-GGJS-H003);2021年度河南省高等教育教学改革研究与实践项目(2021SJGLX881)。

摘　　要：将含有胺基官能团的聚乙烯亚胺大分子链通过化学反应接枝到带有端基-Cl的烷基化硅胶(CPTMS-SiO_(2))上,成功制得聚乙烯亚胺硅胶材料。该吸附材料对Cu^(2+)的吸附容量可达到0.5 mmol/g以上,其吸附行为可用准二级动力学模型、Langmuir和Freundlich吸附模型描述,并测定了吸附热力学数据:焓变(ΔH)、熵变(ΔS)与吉布斯自由能变(ΔG),结果表明该吸附过程是自发吸热过程。Polyethyleneimine(PEI)was successfully grafted onto the alkylating silica gels to obtain a adsorbent designated as PEI-SiO_(2).The adsorption behavior of PEI-SiO_(2) for Cu^(2+)was investigated.The experimental results showed that the adsorption capacity of PEI-SiO_(2) for Cu^(2+)reaches 0.5 mmol/g.The adsorption behavior follows Langmuir and Freundlich adsorption model.The thermodynamic constants of the adsorption process were evaluated,such as enthalpy changes(ΔH),entropy changes(ΔS),and Gibbs free energy changes(ΔG).Results showed that the adsorption of PEI-SiO_(2) for Cu(Ⅱ)is an endothermic and spontaneous process.

关 键 词：硅胶 铜离子 吸附 聚乙烯亚胺 

分 类 号：O642[理学—物理化学]