新型环糊精聚合物对Zn^(2+)的吸附研究  

Adsorption of zinc(Ⅱ) onto a novel cyclodextrin polymer

作　　者：李宁[1] 梅征[1] 

机构地区：[1]重庆工商大学环境与生物工程学院,重庆高校催化理论与应用技术市级重点实验室,重庆400067

出　　处：《中国环境科学》2012年第7期1210-1215,共6页China Environmental Science

基　　金：国家自然科学基金资助项目(20907076);重庆高校创新团队建设计划(KJTD201020);重庆工商大学学科发展重点研究项目(1252002)

摘　　要：以β-环糊精(β-CD)和聚酰胺-胺(PAMAM)为原料,合成了新型环糊精聚合物(PAMAM-CD),并用元素分析、扫描电镜(SEM)和傅里叶红外光谱(FT-IR)对其进行了表征.提出了PAMAM-CD与Zn2+最可能的5种配位方式,研究了PAMAM-CD对Zn2+的吸附动力学及等温吸附特性.结果表明:吸附平衡时间为300min,最佳pH值为5~6.5,吸附量达0.78mmol/g.吸附过程符合伪二级动力学模型,速率控制步骤为粒内扩散控制,吸附等温线符合Freundlich模型.在288,298,303,308K时,ΔG分别为-2.139,-2.417,-2.188和-2.218 kJ/mol,表明PAMAM-CD对Zn2+的吸附是一个自发过程.A novel crosslinked polymer containing β-cyclodextrin（β-CD） and polyamidoamine（PAMAM） was synthesized.The polymer was characterized by element analysis,scanning electron microscope and Fourier transform infrared spectroscopy.Five possible complex mechanisms were mentioned.The adsorption kinetics and isotherms were studied.The results showed that the equilibrium time was 300min,the optimal pH value was 5~6.5,and adsorption capacity was 0.78mmol/g.Adsorption kinetics followed the pseudo 2nd order model.Rate limiting step in the process of adsorption was particle diffusion.Equilibrium isotherm data were satisfactorily fitted by the Freundlich equation.At 288,298,303 and 308K,the ΔG value equaled to-2.139,-2.417,-2.188 and-2.218kJ/mol,respectively,thus the adsorption process was spontaneous.

关 键 词：CD PAMAM-CD Zn2+ 吸附 

分 类 号：X132[环境科学与工程—环境科学]