β-环糊精接枝壳聚糖对酸性红R的吸附研究  

Adsorption of Acid Red R onto Chitosan Grafted with β-Cyclodextrin

作　　者：李海丰[1] 王光辉[1] 王学刚[1] 于荣[1] 汪玉庭[2] 邓南圣[2] 

机构地区：[1]东华理工大学土木与环境工程学院,江西抚州344000 [2]武汉大学资源与环境学院,湖北武汉430079

出　　处：《环境科学与技术》2009年第10期1-4,共4页Environmental Science & Technology

基　　金：国家自然科学基金项目(20563003);教育部新世纪优秀人才支持计划(NCET-06-0268);内蒙古自治区自然科学基金重点项目(200508010203)

摘　　要：为改善壳聚糖的吸附性能,用苯甲醛保护壳聚糖氨基,通过与环氧氯丙烷和β-环糊精的反应合成了新的吸附剂β-环糊精接枝壳聚糖,研究了其对偶氮染料酸性红R的吸附行为,考察了酸性红R的初始浓度、pH对吸附效果的影响。结果发现当酸性红R的浓度≤100mg/g时,合成物的吸附量随酸性红R浓度的增大而增加,当浓度进一步增大时,吸附量趋于平衡。合成物对酸性红R的吸附效果在pH为2～4之间最好。相比于Freundlich吸附等温式(R2=0.8476),β-环糊精接枝壳聚糖对酸性红R的吸附规律明显更符合Langmuir吸附等温式(R2=0.9977)。吸附动力学采用了准一级速率方程(R2=0.8609)和准二级速率方程来描述,结果表明吸附动力学符合准二级速率方程(R2=0.9945)。β-环糊精接枝后的壳聚糖对酸性红R的平衡吸附容量可以提高20.2mg/g。To improve the adsorption properties of chitosan, benzaldehyde was used to protect amino of chitosan, and a novel adsorbent, chitosan grafted with β-cyclodextrin（CS-CD） was synthesized by reaction of chitosan with epichlorohydrin and β-cyclodextrin. Adsorption behavior of Acid Red R onto CS-CD was studied. The affected factors such as initial concentration of Acid Red R and pH on adsorption of Acid Red R were also investigated and described. Adsorption law of Acid Red R onto CS-CD followed Langmuir adsorption isotherm model, and adsorption kinetics can be described with pseudo second-order rate equation. Chitosan grafted with β-cyclodextrin increased the adsorptive capacity for Acid Red R by 20.2mg/g.

关 键 词：壳聚糖 Β-环糊精 酸性红R 吸附 

分 类 号：X131[环境科学与工程—环境科学]