摘要
研究了纳米磁性壳聚糖吸附剂对腐殖酸的吸附性能和重复使用性能,分析了腐殖酸存在的条件下对Cu2+、Pb2+、Cd2+三种重金属离子吸附的影响及机理.实验结果表明:该吸附剂对腐殖酸吸附的最佳pH值为11,饱和吸附量为292mg/g;吸附速度快,15min可达吸附平衡;经5次吸附后,保留了初次吸附量的60%,具有一定的可再生性和重复使用性.同时,该吸附剂吸附腐殖酸后仍可对Cu2+、Pb2+、Cd2+产生吸附作用,较单独吸附时Cu2+、Pb2+的吸附量有所降低,而Cd2+的吸附量则有大幅提高.
The adsorption property of magnetic chitosan nanoparticle for humic acid and metal ions were studied.The adsorption performance of the absorbent on metal ions（Cu2＋,Pb2＋ and Cd2＋） were affected by the presence of humic acid.The experimental results show that the highest adsorption capacity of 292 mg/g for humic acid is obtained at pH=11.The adsorption equilibrium was arrived in 15 min.The adsorption capacity for humic acid remained 60% of the initial adsorption capacity after being used five times.Furthermore,the Fe3O4-chitosan particles could be used to absorb metal ions after adsorption of humic acid.Compared with the results of metal ions alone adsorption,the adsorption capacities for Cu2＋ and Pb2＋ were decreased while the adsorption capacity for Cd2＋ was greatly increased after adsorption of humic acid.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2012年第6期855-859,共5页
Engineering Journal of Wuhan University
关键词
磁性壳聚糖
纳米粒子
吸附
金属离子
腐殖酸
magnetic chitosan
nanoparticle
adsorption
metal ions
humic acid
