表面氧化对多壁碳纳米管理化性质与悬浮稳定性影响的多方法比较研究

张露晴; 汪敏浩; 方婧; 杨坤; 林道辉

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The effect of oxidation on physicochemical properties and aqueous stabilization of multiwalled carbon nanotubes: Comparison of multiple analysis methods

首发时间：2016-07-04

ZHANG Luqing ¹
ZHANG Luqing (1991),female,PhD, Environmental chemistry
WANG Minhao ¹ FANG Jing ² YANG Kun ³ LIN Daohui ¹
LIN Daohui (1973),male,professor,Environmental chemistry

1、Department of Environmental Science, Zhejiang University, Hangzhou 310058, China
2、 School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
3、School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China

Abstract：Surface oxidation can alter physicochemical properties of multiwalled carbon nanotubes (MWCNTs) and influence their aqueous stabilization. Many techniques have been used to characterize the physicochemical properties and aqueous stabilization of MWCNTs. However, the relationship between the change in physicochemical property and the aqueous stabilization of MWCNTs merits more studies, and the multiple characterization techniques have not been well compared. This study systematically and comparatively investigated the effect of oxidation on the physicochemical properties and aqueous stabilization of MWCNTs using multiple analysis methods. Increased surface area, disclosed tube ends, defects on the sidewalls, disruption of the electronic structure, and removal of metal catalysts and amorphous carbon were observed for the oxidized MWCNTs (o-MWCNTs) using the multipoint Brunauer-Emmett-Teller method, transmission electron microscope observation, Raman spectroscopy, UV-vis spectroscopy, and thermogravimetric analysis. An oxidation-time-dependent increase in oxygen content of the MWCNTs was verified by the methods of elemental analysis, mass difference calculation, and X-ray photoelectron spectroscopy (XPS). Fourier transform infrared spectroscopy, XPS, and the Boehm titration were employed to study the functionalities on the MWCNT surfaces. Despite the limitations of these techniques, the results indicated that the dramatic increase in carboxyl groups was mainly responsible for the significant increase in oxygen content after the oxidation. The dissociation of the grafted functional groups increased electronegativity of the o-MWCNTs and facilitated the aqueous stabilization of o-MWCNTs through electrostatic repulsions. The oxidation affected the UV-vis absorbance of MWCNT suspensions. The absorbances at 800 nm of the stabilized MWCNT suspensions had a good correlation with the MWCNT concentrations and could be used to quantify the MWCNT suspensions. The findings of this work are expected to boost the research on carbon nanotubes and their environmental behaviors.

keywords： Environmental chemistry carbon nanomaterials acid treatment characterization techniques colloidal behavior

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表面氧化对多壁碳纳米管理化性质与悬浮稳定性影响的多方法比较研究

张露晴 ¹
ZHANG Luqing (1991),female,PhD, Environmental chemistry
汪敏浩 ^{1
2} 方婧 ² 杨坤 ^{1
3} 林道辉 ^{1
3}
LIN Daohui (1973),male,professor,Environmental chemistry

1、浙江大学环境科学系，杭州，310058
2、浙江工商大学环境科学与工程学院，杭州，310012
3、浙江省有机污染过程与控制重点实验室，杭州，310058

摘要：强酸氧化对碳纳米管理化性质及水中悬浮稳定性的影响已有多种表征方法，但各方法优缺点及碳管理化性质与其悬浮稳定性的关系有待比较研究。论文比较了比表面仪、TEM、拉曼、热重等对碳管物理性质的表征作用，元素分析、红外、XPS及Boehm滴定等对碳管化学性质的表征作用；分析了碳管含氧量与其悬浮稳定性的关系。发现，强酸氧化在碳管表面引入羧基等含氧官能团，增加其负电性和悬浮稳定性。各种表征方法均有优缺点，需要联用多种表征方法。

关键词：环境化学碳纳米材料强酸氧化表征技术胶体行为

基金：

1. the Specialized Research Fund for the Doctoral Program of Higher Education （No. 20130101110132)）

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ZHANG Luqing,WANG Minhao,FANG Jing,et al. The effect of oxidation on physicochemical properties and aqueous stabilization of multiwalled carbon nanotubes: Comparison of multiple analysis methods[EB/OL]. Beijing:Sciencepaper Online[2016-07-04]. https://www.paper.edu.cn/releasepaper/content/201607-22.

No.4698258987673146****

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论文编号	201607-22
论文题目	表面氧化对多壁碳纳米管理化性质与悬浮稳定性影响的多方法比较研究
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