改性黄原胶/膨润土复合树脂对Cu^(2+)的吸附热力学与动力学研究  

Adsorption thermodynamics and kinetics of copper ions by modified XG/bentonite composite absorbent

作　　者：苗宗成[1] 李宜洋[2] 李仲谨[1,2] 

机构地区：[1]西京学院,西安710123 [2]陕西科技大学,西安710021

出　　处：《化工新型材料》2012年第5期90-92,95,共4页New Chemical Materials

基　　金：陕西省科技计划项目(2008K06-15);"十一五"国家科学技术支撑计划项目(2006BAD09B04)

摘　　要：以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)和丙烯酸(AA)为单体,利用水溶液聚合法制备了改性黄原胶/膨润土复合树脂。研究了复合树脂对Cu2+的静态吸附行为,并分析了其吸附热力学和动力学特征。采用红外光谱仪(FT-IR)和X射线衍射仪(XRD)对复合树脂及吸附产物结构进行了表征。结果表明:在303K、313K和323K温度下,复合树脂对Cu2+吸附等温线同时符合Langmuir和Freundlich等温方程,吸附是一个自发的吸热过程,吸附行为可以用二级吸附动力学模型来描述,吸附后复合树脂的结晶能力下降。XG/bentonite composite absorbent was prepared by aqueous solution polymerization using acrylic acid and 2-acrylamido-2-methyl-propane sulfonic acid as monomers. The static adsorption behavior of composite resin was inves- tigated,and the characteristics of adsorption thermodynamics and kinetics were measured. The structure of composite ab- sorbent and adsorption products was characterized by FT-IR and XRD. The property of adsorption kinetics was studied. The results showed that the Cuz＋ adsorption behavior of composite absorbent conformed to the Langmuir and the Freundli- ch isotherms at temperatures of 303K,313K and 323K, respectively. The adsorption was a spontaneous and an enothermic t3rocess of increased entropy, the adsorption process fitted well with pseudo-second order model. The crystallinity of the composite absorbent was decreased after adsorbing Cu^2＋.

关 键 词：黄原胶 复合树脂 CU2+ 热力学 动力学 

分 类 号：O647.32[理学—物理化学] X703[理学—化学]