碳纳米管对水中多氯联苯的吸附动力学  

Adsorption kinetics of carbon nanotubes on polychlorinated biphenyls in aqueous solution

作　　者：曹秀芹[1] 程琳[1] 李志强[1] 

机构地区：[1]北京建筑大学城市雨水系统与水环境省部共建教育部重点实验室,北京100044

出　　处：《环境工程学报》2017年第9期5041-5048,共8页Chinese Journal of Environmental Engineering

基　　金：北京市教委(北京市自然科学基金)科技重点项目(KZ201310016017)

摘　　要：通过静态吸附实验研究了碳纳米管(CNTs)对水中多氯联苯(PCBs)的吸附动力学特性,包括1种单壁碳纳米管(SWCNTs)和3种多壁碳纳米管(MWCNTs),并对4种CNTs的物理特征及孔径分布进行了分析。结果表明,SWCNTs的比表面积和总孔容最大,分别为228.210 m^2·g-1和1.515 4 cm^3·g-1。CNTs对PCBs的吸附速率很快,40 min吸附量可达到平衡时的90%以上,80 min左右达到吸附平衡,且SWCNTs的吸附能力远大于MWCNTs。运用拟一级和拟二级动力学模型对实验数据进行拟合,表明拟二级模型更适合描述CNTs对PCBs的吸附过程。Static experiments were carried out to investigate adsorption kinetics of polychlorinated biphenyls（PCBs） on carbon nanotubes（CNTs） from aqueous solution,including a single-walled carbon nanotubes（SWCNTs） and three kinds of multi-walled carbon nanotubes（MWCNTs）. And the physical characteristics and pore size distribution of CNTs were analyzed. The results showed that SWCNTs＇ specific surface area and total pore volume were the largest,which were 228. 210 m^2·g^-1and 1. 515 4 cm^3·g^-1,respectively. The adsorption rate of CNTs on PCBs was so fast that the adsorption capacity of 40 min can reach more than 90% of equilibrium,and the adsorption equilibrium was reached at about 80 min. Furthermore,the adsorption capacity of SWCNTs was much larger than that of MWCNTs. The pseudo-first-order model and pseudo-second-order model were used to fit the experimental data,which indicated that the pseudo-second-order model showed more suitable to describe the adsorption process of PCBs to CNTs.

关 键 词：碳纳米管 多氯联苯 吸附 拟一级动力学 拟二级动力学 

分 类 号：X703[环境科学与工程—环境工程]