黄原酸酯改性碳纳米管及对铅离子吸附性能研究

Adsorbing performance of lead ions(Pb^(2+)) in xanthate-modified carbon nanotubes

采用共价键改性对碳纳米管(CNT)进行氧化使之形成分散性较好的氧化碳纳米管(OCNT),然后在氧化碳纳米管上引入黄原酸酯基团,提高吸附能力。通过氧化碳纳米管与不同比例的二硫化碳(CS2)反应获得的改性碳纳米管(COCNT)对金属铅离子(Pb2+)的吸附研究,得出COCNT-0.2吸附剂对Pb2+有很强的吸附能力,最大吸附量为357.14 mg/g。吸附过程符合准二级动力学方程和Langmuir等温吸附曲线。

The oxidized carbon nanotubes （OCNTs） with good dispersity were obtained through oxidizing carbon nanotubes using covalent-bond modification. The adsorbing capacity of OCNTs was improved when the xanthate group was introduced to them. The adsorption of lead ions （Pb^2＋ ） in modified carbon nanotubes （COCNTs） which were achieved through the reaction of OCNTs and the various ratios carbon disulfide （ CS2 ） were investigated. The results showed that the COCNT-0.2 had good adsorbing capacity to Pb^2＋ with the max adsorption of 357.14 mg/g. The adsorption process was in accord with pseudo-second order kinetics equation and Langmuri sorption isotherm equation.