Publication Type:Journal Article
Source:Environ Sci Technol, Volume 38, Number 21, p.5786-96 (2004)
Keywords:Adsorption, Carbon/ chemistry, Graphite/chemistry, Hydrocarbons, Aromatic/chemistry/ isolation & purification, Oxidation-Reduction, Oxygen/chemistry, Phenols/chemistry/isolation & purification, Porosity, Surface Properties, Thermodynamics, Water Pollutants, Chemical/analysis/ isolation & purification, Water/ chemistry
Carbon materials with different textural and surface chemistry properties have been studied to analyze their behavior in removing aromatic compounds (phenol, o-chlorophenol, p-nitrophenol, aniline, and phenol compound mixtures) from water. A mesoporous high surface area graphite and a microporous activated carbon with (HSAGox and ACox) and without (HSAGT and ACT) oxygen surface groups, were used as adsorbents. Apparent surface areas, surface oxygen groups, and zero points of charge have been determined. The adsorption behavior of single compounds on ACT depends on the relation between the molecular and the pore sizes. The aniline, the nitrophenol, and the chlorophenol interact with the oxygen surface groups of oxidized graphite, while there is no evidence of any type of interaction of the phenol with these groups. The adsorption of the organic compound mixtures on the thermally treated samples is determined by the acid-base character of the adsorbate-adsorbent, whereas on the oxidized carbons, the controlling forces are the specific interactions between organic molecules and the oxygenated groups. Selectivity coefficients for the different mixtures are presented over the entire range of adsorption.
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