• 关键词：多壁碳纳米管  巯基硅烷改性  吸附机理  镉(Cd)

• 基金项目：国家自然科学基金（No.21577131，41271337）；浙江省自然科学基金重点项目（No.LZ15D010001）

• 汲广云
• 1. 浙江省土壤污染生物修复重点实验室, 临安 311300;2. 浙江农林大学环境与资源学院, 临安 311300

• 郭明
• 浙江农林大学化学系, 临安 311300

• 杨兴
• 1. 浙江省土壤污染生物修复重点实验室, 临安 311300;2. 浙江农林大学环境与资源学院, 临安 311300

• 陆扣萍
• 1. 浙江省土壤污染生物修复重点实验室, 临安 311300;2. 浙江农林大学环境与资源学院, 临安 311300

• 王海龙
• 1. 浙江省土壤污染生物修复重点实验室, 临安 311300;2. 浙江农林大学环境与资源学院, 临安 311300

• 摘要：利用3-巯丙基三甲氧基硅烷（MPTMS）作硅烷偶联剂对多壁碳纳米管（MWCNTs）进行改性，制备巯基硅烷改性多壁碳纳米管（SH-MWCNTs），并进行了SH-MWCNTs对Cd²⁺的批量吸附实验.同时，利用扫描电镜（SEM）、X射线光子能量仪（EDS）、红外光谱（FT-IR）对SH-MWCNTs进行表征，探究了溶液初始pH、吸附剂投加量、吸附时间、溶液初始Cd²⁺浓度等因素对吸附效果的影响，分析了吸附动力学特征及吸附等温线特征，初步探讨了吸附机理.SEM、EDS与FT-IR图谱显示，MPTMS已成功接枝到MWCNTs表面，表明SH-MWCNTs制备成功.吸附时间为90 min，pH为4时的吸附效果最佳，吸附量随SH-MWCNTs投加量、Cd²⁺浓度的增加而增大.吸附动力学和吸附等温线研究表明，SH-MWCNTs对Cd²⁺的吸附动力学符合准二级线性方程，吸附等温线符合Freundlich、Langmuir 2种模型，吸附以单分子层吸附为主，也存在层间扩散的多层吸附.

• Abstract：To enhance heavy metal adsorption capacity of multi-walled carbon nanotubes (MWCNTs), sulphydryl multi-walled carbon nanotubes (SH-MWCNTs) were synthesized using 3-mercaptopropyl trimethoxysilane as silane coupling agent to modify MWCNTs. Scanning Electron Microscope, Energy Dispersive X-Ray Spectrometer and Fourier Transform Infrared Spectrometer were employed to characterize the physical and chemical properties of SH-MWCNTs. It was found that sulphydryl groups were successfully grafted onto the surface of MWCNTs. A batch equilibration method was used to determine the effect of modification on Cd²⁺ adsorption capacity of the MWCNTs, under various initial solution pH, adsorbent dosage, adsorption time, and initial Cd²⁺ concentrations. The characteristics of adsorption isotherms and adsorption kinetics were analyzed to reveal associated mechanisms. The results show that adsorption of Cd²⁺ increased with the application rate of SH-MWCNTs and initial Cd²⁺ concentration in solution. The greatest adsorption of Cd²⁺ on SH-MWCNTs occurred at the initial pH 4 after 90 min. The adsorption kinetics corresponded to the pseudo-second order linear equations. The adsorption isotherms demonstrated that the adsorption of Cd²⁺ to the SH-MWCNTs was well described by both Freundlich and Langmuir models. Monolayer adsorption was the main adsorption process, although there were also multilayer adsorptions.

• Key words：multi-walled carbon nanotubes  silanization  adsorption  cadmium

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