Adsorption of toluene, ethylbenzene and xylene isomers on multi-walled carbon nanotubes oxidized by different concentration of NaOCI

作     者：Fei YU Jie MA Yanqing WU 

作者机构：School of Environmental Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Pollution Control and Resource ReuseSchool of Environmental Science and EngineeringTongji UniversityShanghai 200092China 

出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)

年 卷 期：2012年第6卷第3期

页      面：320-329页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by the National High Technology Research and Development Program of China (863 Program) supported by the Shanghai Jiao Tong University Innovation Fund for Postgraduates 

主　　题：adsorption toluene ethylbenzene and xylene isomers (TEX) multi-walled carbon nanotube surface oxidation 

摘      要：Multi-walled carbon nanotubes （MWCNTs） were fabricated and oxidized by different concentrations of sodium hypochlorite （NaOC1） solutions. The untreated MWCNTs and modified MWCNTs were employed as adsorbents to study their characterizations and adsorption performance of toluene, ethylbenzene and xylene isomers （TEX） in an aqueous solution. The physicochemical properties of MWCNTs were greatly affected after oxidation, which influences TEX adsorption capacity. The 3% NaOCl-oxidized MWCNTs shows the greatest enhancement in TEX adsorption, followed by the 30% NaOCl. More interestingly, the 15% NaOCl-oxidized MWCNTs has lower adsorption capacities than untreated MWCNTs. The adsorption mechanism of TEX on treated MWCNTs is attributed to the combined action of hydrophobic interaction, π-π bonding interaction between the aromatic ring of TEX and the oxygen-containing functional groups of MWCNTs and electrostatic interac- tion. 3% NaOCl solution could not only introduce much oxygen-containing functional groups on MWCNTs, but also lead to less damage for the pore structure. This suggests that the CNTs-3% NaOCl is efficient adsorbent for TEX and that they may possess good potential for TEX removal in wastewater treatment.