交联壳聚糖树脂对Au(Ⅲ)的等温吸附特性和吸附动力学  

Isothermal Adsorption Properties and Adsorption Kinetics of a Crosslinked Chitosan on Au(Ⅲ)

作　　者：宋颖韬[1] 党明岩[1] 张晓磊[2] 

机构地区：[1]沈阳理工大学环境与化学工程学院,辽宁沈阳110159 [2]沈阳石蜡化工有限公司,辽宁沈阳110141

出　　处：《化学与粘合》2014年第4期233-235,239,共4页Chemistry and Adhesion

基　　金：国家自然科学基金资助项目(编号:51004072)

摘　　要：以戊二醛为交联剂、用硫脲进行接枝改性合成了交联壳聚糖树脂,研究其对Au(Ⅲ)的吸附特性,考察了pH值、吸附温度、吸附时间等因素对吸附过程的影响。结果表明:溶液pH值对吸附影响较大,最佳pH值在5.0左右;在实验浓度和温度范围内,树脂对Au(Ⅲ)的等温吸附数据与Freundlich模型拟合较好;吸附过程宏观表现为吸热过程;吸附动力学符合准二级动力学方程,表观活化能为41.12kJ/mol,吸附过程主要为化学吸附控制。A crosslinked chitosan resin was synthesized from thiourea with glutaraldehyde as the crosslinking agent by graft modification. The effects of pH value, adsorption temperature and duration on the adsorption process of Au（ m ） were studied. The results showed that the pH value could affect the process greatly; the ideal pH value should be 5.0. The isothermal adsorption would follow the Freundlich equation with a certain concentration and at a certain range of temperature. The adsorption exhibited an endothermic process macroseopically. The adsorption kinetics followed the pseudo-second-order kinetics model and the adsorption apparent energy of activation was 41.12kJ/mol. The adsorption process was mainly chemical adsorptions.

关 键 词：壳聚糖 吸附 金 动力学 

分 类 号：TQ424.3[化学工程]