期刊
JOURNAL OF ENVIRONMENTAL SCIENCES
卷 24, 期 8, 页码 1411-1417出版社
SCIENCE PRESS
DOI: 10.1016/S1001-0742(11)60924-8
关键词
chlorophenols; mesoporous SBA-15; adsorption; pH; temperature
资金
- Postdoctoral Fund of Southeast University
- Natural Science Foundation of Jiangsu Province [BK2009294]
Studies on the effect of the chlorine content of chlorophenols (CPs) on their adsorption from aqueous solution by mesoporous SBA-15 are important in understanding the mechanisms of CP adsorption. In this study, three CPs with different degrees of chlorine content (i.e., 2-chlorophenol, 2,6-dichlorophenol and 2,4,6-trichlorophenol) were investigated. The effects of parameters such as temperature and solution pH were studied. The results showed that CP adsorption by SBA-15 increased with increasing number of chlorine substituents and depended strongly on the temperature and solution pH. Thermodynamic parameters such as Gibbs free energy change (Delta G(0)), enthalpy change (Delta H-0) and entropy change (Delta S-0) were also calculated. By comparison of the adsorption coefficient of CPs with varying physical-chemical properties (size, hydrophobicity and electron density), we propose that hydrophobic interactions between CPs and the SBA-15 surface, as well as electron donor-acceptor (EDA) complexes between oxygen of the siloxane surface of SBA-15 (e(-)-donor) and the pi-system of the CPs (e(-)-acceptor), were dominant adsorption mechanisms.
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