有机-无机复合材料壳聚糖/氧化钇对Cr(Ⅵ)的吸附动力学与热力学研究  

Kinetics of adsorption and thermodynamics of Cr(Ⅵ) on organic-inorganic chitosan/yttrium oxide composite

作　　者：王芳芳[1] 葛明桥[1] 王亚洲[1] 卢丽萍[1] 

机构地区：[1]江南大学纺织服装学院,无锡214122

出　　处：《化工新型材料》2012年第8期97-99,106,共4页New Chemical Materials

基　　金：国家高技术研究发展计划(863)资助项目(2012AA030313)

摘　　要：以壳聚糖为包覆材料,采用花状Y2O3颗粒作为内核,制备有机-无机复合材料壳聚糖-氧化钇复合吸附剂。并通过扫描电镜(SEM)、透射电镜(TEM)、红外光谱(IR)的方法对复合材料进行表征。考察了pH值对吸附行为的影响并对吸附机理进行了分析。相关系数表明,拟二级模型可以更准确地模拟吸附动力学,说明该吸附过程主要由化学吸附控制。Langmuir等温线与实验数据拟合度较高。通过对吸附热力学参数进行分析,发现该吸附过程可以自发进行,是吸热反应。The chitosan/yttrium oxide composite was prepared by coating chitosan on the surface of Y203 powders. The product was characterized by SEM, TEM and IR methods. The effect of pH on adsorption behavior and the mechanism of Cr（VI ）were discussed in detail. Regression results showed that the adsorption kinetics was more accurately fitted by a pseudo second order model, so the sorption of Cr（ VI ）was likely to be controlled by the chemical process. The results revealed that the Langmuir isotherm was fitted by the experimental results well. Thermodynamic parameters indicated that the nature of Cr（VI ）sorption was spontaneous and endothermic.

关 键 词：壳聚糖/氧化钇 吸附 Cr(Ⅵ)离子 动力学 热力学 

分 类 号：O647.31[理学—物理化学]