期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 186, 期 1, 页码 407-415出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2010.11.012
关键词
Multi-walled carbon nanotubes; Adsorption; Ionizable organic contaminant
资金
- National Basic Research Program of China [2011CB936002]
- National Natural Science Foundation of China [20837001]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0813]
- Program for New Century Excellent Talents in University [NCET-08-0079]
Multi-walled carbon nanotubes (MWNTs), which are considered to be promising candidates for the adsorption of toxic organics, are released into aqueous environment with their increasing production and application. In this study, the adsorption behaviors of five structurally related ionizable organic contaminants namely perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA), perfluorooctanesulfonamide (PFOSA), 2,4-dichlorophenoxyacetic acid (2,4-D) and 4-n-nonylphenol (4-NP) onto MWNTs with different oxygen contents (3.84-22.85%) were investigated. The adsorption kinetics was investigated and simulated with pseudo-second-order model. The adsorption isotherms were found to be fitted with Freundlich model and influenced by both the properties of organic chemicals and the oxygen contents of MWNTs. As adsorption capacity decreases dramatically with the increasing of oxygen contents. the MWNTs with the lowest oxygen contents possess the highest adsorption capacity among four MWNTs. For the MWNTs with the oxygen contents of 3.84%, the adsorption affinity related with hydrophobic interaction and pi-electron polarizability decreased in the order of 4-NP > PFOSA > PFOS > 2,4-D > PFOA. Furthermore, the adsorption characters of five contaminants were affected by solution pH and solute pK(a) considering electrostatic repulse force and hydrogen bonding, which showed the adsorption of MWNTs with lower oxygen content is much sensitive to solution chemistry. (c) 2010 Elsevier B.V. All rights reserved.
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