聚多巴胺改性碳纳米管对Pb^(2+)的吸附性能  

Adsorption Performance of Polydopamine-modified Carbon Nanotubes for Pb^(2+) Ions

作　　者：李鹏莉 于树玲[1] 石家华[1] 

机构地区：[1]河南大学天然药物与免疫工程重点实验室,河南开封475004

出　　处：《河南大学学报（自然科学版）》2014年第4期416-420,共5页Journal of Henan University:Natural Science

基　　金：国家自然科学基金(21073054);河南省自然科学基金(102300410180);河南大学省部共建基金(SBGJ090708)

摘　　要：研究了聚多巴胺改性碳纳米管对水溶液中Pb2+离子的吸附性能,考察了初始pH和吸附时间对该吸附过程的影响.该过程的吸附动力学符合准二级动力学模型,通过Langmuir吸附等温式描述更为合适,属于单分子层吸附.同时,对聚多巴胺改性前后的碳纳米管吸附Pb2+的能力进行了对比研究.结果表明,多巴胺改性的碳纳米管对Pb2+的吸附性能优于原始碳纳米管,平衡吸附量可达34.0mg/g.Adsorption properties of polydopamine-modified carbon nanotubes （CNTs@ PDA） for Pb2＋ ions were investigated. The influences of the initial pH and contact time on the adsorption process were studied. The adsorption kinetics within the pseudo-second-order model and Langmuir isotherm model was well suitable for the adsorption process, suggesting that the adsorption was a monolayer process. Meanwhile, the contrastive study was carried out about the Pb2＋ adsorption capacity of carbon nanotubes before and after modification by polydopamine. The results showed that the CNTs@PDA exhibited better adsorption ability for Pb2＋ ions than pristine CNTs and equilibrium sorption capacity of the CNTs@PDA was 34.0 mg/g.

关 键 词：聚多巴胺 碳纳米管 吸附 PB2+ 吸附动力学 

分 类 号：X523[环境科学与工程—环境工程]