期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 174, 期 1-3, 页码 592-597出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2009.09.093
关键词
beta-Cyclodextrin; Carcinogens; Direct azo dye; Aromatic amines; Sorption; Solid-phase extraction
资金
- German Ministry of Education and Research (BMBF)
- Scientific and Technical Research Council of Turkey (TUBITAK) [U/118-104T258]
- Scientific Research Projects Foundation of the Selcuk University (BAP)
Two beta-cyclodextrin (beta-CD)-based polymers were synthesized using 4,4'-methylene-bis-phenyldiisocyanate (MDI) or hexamethylenediisocyanate (HMDI) as a cross linking agent in dimethylformamide and used as sorbents for the removal of azo dyes (Evans Blue and Chicago Sky Blue), as well as aromatic amines (benzidine. p-chloroaniline and alpha-naphthalamine) from aqueous solutions. The sorption experiments were carried out by using batch-wise procedure involving the determination of pH effect, sorbate concentration and contact time. Moreover, from the equation isotherms such as Langmuir and Freundlich were successfully applied to model the experimental data. From the results polymer 2 was found to be a better sorbent for both azo dyes and the aromatic amines as compared to polymer I as proved by Langmuir isotherm model. The proposed sorption mechanism involved several kinds of interactions: physical adsorption, hydrogen bonding and formation of an inclusion complex due to the beta-CD molecules through host-guest interactions. (C) 2009 Elsevier B.V. All rights reserved.
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