新型壳聚糖衍生物吸附剂对Ni^(2+)的吸附行为  

Adsorption Behavior of Ni^(2+) onto New Chitosan Derivative Sorbent

作　　者：唐雪娇[1] 杨丽[1] 吴丰鹏[1] 高敏[1] 沈伯雄[1] 

机构地区：[1]南开大学环境科学与工程学院,天津300071

出　　处：《天津大学学报》2011年第11期979-983,共5页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(50976050);中央高校基本科研业务费专项资金资助项目(65010451)

摘　　要：利用Ni2+印迹法,通过交联和胺化反应自制新型多胺化球形Ni2+模板交联壳聚糖吸附剂(P-C-CTS(Ni)),研究吸附剂对Ni2+的吸附行为,通过模型拟合和吸附动力学对吸附过程和方式进行讨论.通过扫描电镜表征,P-C-CTS(Ni)呈球体,内部具多孔结构.室温下对不同浓度Ni2+溶液进行吸附研究,吸附数据与Freundlich模型和BET模型拟合较好,证明该吸附剂呈多孔结构,吸附性能好,吸附过程为多层分子吸附.吸附动力学研究表明该吸附剂在不同温度下对Ni2+吸附过程均包括3个阶段,即外表面扩散吸附、内表面扩散吸附和平衡吸附.30℃条件下,吸附数据对二级扩散方程拟合较好,二级速率常数k为8.119×10-3 g/(mg.min),说明该吸附剂对Ni2+吸附机理以化学吸附为主,受化学吸附控制.A new chitosan derivative sorbent （P-C-CTS （Ni）） was prepared by crosslinking and amination reactions with Ni2＋ imprinting method. The adsorption behaviors of P-C-CTS （Ni） were investigated by model-fitting and kinet- ics studies. The appearance and porous structure ofP-C-CTS （Ni） were characterized by SEM. Under varied concentration of Ni2＋ at room temperature, the isotherm adsorptions were fitting both Freundlich model and BET model, indicating that the sorbent had porous structure and carried out a multilayer molecule adsorption process. The results show that there are three steps for Ni2＋ adsorption at different temperatures （surface diffusion adsorption, internalsurface diffusion adsorption and balance adsorption）. The data at 303 K correlate well with the second-order kinetic model, the sorption rate constant being 8.119×10-3 g/（mg · min）, which indicates that chemical sorption is the main sorption mechanism and controls the adsorption procedures.

关 键 词：壳聚糖衍生物吸附剂 吸附等温模型 吸附动力学 扩散方程拟合 

分 类 号：Q539[生物学—生物化学]