氧化石墨/壳聚糖磁性复合吸附剂对活性艳红吸附性能研究  

Adsorption properties of reactive red(X-3B) on graphite oxide/chitosan magnetic composite

作　　者：肖玲[1] 陈艺羡[1] 

机构地区：[1]武汉大学资源与环境科学学院,湖北武汉430079

出　　处：《武汉大学学报（工学版）》2012年第6期860-864,共5页Engineering Journal of Wuhan University

摘　　要：采用原位共沉淀法制备了氧化石墨/壳聚糖磁性复合吸附剂,研究了氧化石墨/壳聚糖磁性复合吸附剂对活性艳红的吸附行为,发现壳聚糖与氧化石墨的加入量为重量比在200:1时对活性艳红的吸附量最大.考察了氧化石墨/壳聚糖磁性复合吸附剂在不同pH值、不同时间下对活性艳红的吸附性能.实验结果表明,该吸附剂吸附活性艳红的最佳pH值为2,饱和吸附量为706mg/g,吸附速度快,对活性艳红的吸附在30min内达吸附平衡.吸附过程可用Langmuir吸附等温线描述,符合二级动力学方程.经10次吸附后,对活性艳红仍保留了初次吸附量的61%,具有一定的重复使用性.The graphite oxide/ chitosan magnetic composite were repared by the in-situ coprecipitation reaction in alkaline solution.The adsorption properties of reactive red（X-3B） on graphite oxide/chitosan magnetic composite were studied.The highest adsorption capacity was obtained at 200：1 mass ratio of chitosan to graphite oxide.The effects of medium pH,time on the adsorption capacity of graphite oxide/chitosan magnetic composite were studied.The experimental results show that the highest adsorption capacity of 706mg/g was obtained at pH 2.The adsorption equilibrium was arrived at 30 min.Kinetics data and adsorption isotherm were better fitted by pseudo-second-order kinetic model and by Langmuir isotherm,respectively.The adsorbent has good property for repeated use and remained 61% of original adsorption capacity after being used 10 times.

关 键 词：氧化石墨 壳聚糖 活性艳红染料 吸附 

分 类 号：O647.3[理学—物理化学]