摘要:为解决水体中的重金属Pb2+离子所带来的污染问题,本文在制备得到介孔二氧化硅包裹多壁碳纳米管(MWCNTs$mSiO2)材料的基础上,通过进一步的氨基化修饰而最终得到了氨基功能化改性的多壁碳纳米管(MWCNTs$mSiO2~NH2)。采用傅里叶变换红外光谱(FT-IR)、透射电镜(TEM)对所得材料进行了表征分析。将MWCNTs$mSiO2~NH2作为吸附剂用于水溶液中Pb2+离子的吸附研究,结果表明:MWCNTs$SiO2~NH2较原始MWCNTs具有更好的水分散性并提高了对Pb2+离子的吸附能力;吸附过程展现出了较好的动力学性能且符合准二级动力学方程;由Langmuir方程模拟而求得的最大吸附量为119.3mg/g。31227 毕业论文关键字:碳纳米管;Pb2+离子;吸附;二氧化硅
Preparation of Amine Functionalized Multi-walled Carbon Nanotubes and Their Adsorption Behavior for Pb2+ Ions
Abstract:To resolve the water pollution brought by Pb2+ ions,amine functionalized multi-walled carbon nanotubes (MWCNTs$mSiO2~NH2) was prepared through firstly preparing mesoporous silica coated multi-walled carbon nanotubes (MWCNTs$mSiO2~NH2) and then following by the further amino-group modification.The prepared material was characterized by Fourier transform infrared spectrometry (FT-IR) and transmission electron microscopy (TEM).Finally, MWCNTs$mSiO2~NH2 was used for Pb2+ ions adsorption.The results showed that MWCNTs$mSiO2~NH2 was more dispersible in water compared to the original MWCNTs and exhibited higher adsorption ability for Pb2+ ions.The adsorption process showed good kinetic performance and could be described by pseudo-second-order kinetic model.The maximum adsorption capacity obtained from Langmuir isotherm model was 119.3mg/g.
Key Words:Carbon nanotubes;Pb2+ ions;Adsorption;Silica
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