Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2019, Vol. 55 ›› Issue (5): 961-967.DOI: 10.13209/j.0479-8023.2019.061

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Adsorption of Phenol by Oxidized Multi-Walled Carbon Nanotubes

HAI Hao1, WANG Ke1, MA Yibo1, ZHANG Jing1, XIA Jianxin1, XING Xuan1,†, WANG Ting2   

  1. 1. College of Life and Environmental Sciences, Minzu University of China, Beijing 100081 2. Department of Environmental Science and Engineering, Peking University, Beijing 100871
  • Received:2018-08-07 Revised:2018-09-14 Online:2019-09-20 Published:2019-09-20
  • Contact: XING Xuan, E-mail: xingxuanpku(at)


海浩1, 王可1, 马忆波1, 张璟1, 夏建新1, 邢璇1,†, 王婷2   

  1. 1. 中央民族大学生命与环境科学学院, 北京 100081 2. 北京大学环境科学与工程学院, 北京 100871
  • 通讯作者: 邢璇, E-mail: xingxuanpku(at)
  • 基金资助:


Organic compounds pollution, especially phenolic compounds, has been a serious problem recently. Multi-walled carbon nanotubes (MWCNTs) were oxidized by mixed acid oxidation method to remove phenolic compounds by adsorption. Five typical phenolic compounds including phenol, p-cresol, p-methoxyphenol, phydroxybenzaldehyde and p-nitrophenol were selected and to be adsorbed on MWCNTs and MWCNTs-O, respectively. Results showed that compared with the unmodified MWCNTs, the adsorption capacity of five phenolic compounds on MWCNTs-O increased significantly. The adsorption amount of five phenols on MWCNTs-O was different and the order was p-nitrophenol >p-methoxyphenol > p-hydroxybenzaldehyde > p-cresol > phenol. Adsorption isotherm data for the five phenols fitted Langmuir model well, which proved that phenolic compounds on MWCNTs was monolayer chemisorption. Surface functional groups analyzation of MWCNTs-O indicated that acidic oxygen-containing functional groups increased. TEM and Raman spectroscopy showed the winding degree of MWCNTs decreased, and overall dispersion and the degree of graphitization increased. π-π conjugation between vertical π electrons on MWCNTs-O and π electrons of phenolic compounds was formed and the electronic energy (EE) could be used as indicator for phenols adsorption on MWCNTs-O.

Key words: multi-walled carbon nanotubes, phenols, oxidation modification, adsorption, π-π conjugation


针对目前有机废水(尤其是酚类废水)污染严重的问题, 通过混酸氧化法对多壁碳纳米管(multi-walled carbon nanotubes, MWCNTs)进行氧化改性(MWCNT-O), 并研究其改性前后对苯酚、对甲苯酚、对甲氧基苯酚、对羟基苯甲醛和对硝基苯酚5种典型酚的吸附作用。结果表明: 298 K下, 与未改性的MWCNTs相比, MWCNTs-O对5种酚类物质的吸附量均有提升。5种酚类物质在MWCNTs-O表面的吸附量有差别, 顺序为对硝基苯酚>对甲氧基苯酚>对羟基苯甲醛>对甲苯酚>苯酚。吸附过程符合Langmuir吸附等温方程, 主要为单分子层化学吸附。对MWCNTs-O进行表面官能团测试、透射电镜分析和拉曼光谱分析, 发现氧化改性后材料表面的酸性含氧官能团增多, 缠绕度降低, 整体分散性增强, 石墨化程度有所提升。通过研究分子结构与吸附量之间的关系, 发现吸附量与酚类物质的电子能量(electronic energy, EE)有显著的相关性, MWCNTs-O表面垂直的π电子和酚类物质的π电子形成π-π共轭作用。因此, EE 可以作为酚类物质在MWCNTs-O表面平衡吸附量的预测性指标。

关键词: 多壁碳纳米管, 酚类物质, 氧化改性, 吸附, π-π 共轭