期刊
DESALINATION
卷 266, 期 1-3, 页码 231-237出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.desal.2010.08.031
关键词
Dimethyl trisulfide; beta-Cyclocitral; Granular activated carbon (GAC); Adsorption isotherms; Natural organic matter (NOM)
资金
- National Natural Science Foundation of China [50878163, 50708067]
- National Major Project of Science & Technology Ministry of China [2008ZX07421-002]
- Ministry of Housing and Urban-Rural Development [2009-K7-4]
This study was to investigate granular activated carbon (GAC) adsorption of two algal odorants in water, dimethyl trisulfide and beta-cyclocitral. Among the four isotherm models (Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich), Freundlich isotherm showed the best fitting with the equilibrium data in terms of the coefficient of determination (R-2) and Chi-square (chi(2)). Based on the parameters determined in the Freundlich isotherm equations for GAC adsorption of a single odorant, we successfully predicted the GAC adsorption behavior in a bisolute solution using the Ideal Solution Adsorption (IAS) model. In the kinetics study of the two odorants adsorption by GAC, pseudo first-order and pseudo second-order kinetic models both well fit the experimental data. The calculated Gibbs free-energy changes for GAC adsorption of dimethyl trisulfide and beta-cyclocitral were -3.61 and -4.24 kJ/mol at 298 K. respectively. The pH effects on GAC adsorption of dimethyl trisulfide and beta-cyclocitral were different. Alkaline condition (pH >10) favored GAC adsorption of dimethyl trisulfide, however, adsorption of the beta-cyclocitral was not significantly influenced by pH (2-13). The presence of natural organic matter (NOM) hindered adsorption of dimethyl trisulfide and beta-cyclocitral to different degrees. Low molecular weight NOM fractions (particularly <1000) showed the significant inhibiting effect in the GAC adsorption. (C) 2010 Elsevier B.V. All rights reserved.
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