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Equilibrium adsorption of chlorophenols on granular activated carbon
Author(s) -
Nelson Peter O.,
Yang Maoyu
Publication year - 1995
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143095x133103
Subject(s) - adsorption , pentachlorophenol , chemistry , activated carbon , chlorophenol , aqueous solution , freundlich equation , langmuir , phenols , equilibrium constant , carbon fibers , inorganic chemistry , chromatography , phenol , organic chemistry , materials science , composite number , composite material
The adsorption of chlorinated phenols from aqueous solution on granular activated carbon was studied in batch reactors. Single‐component equilibrium adsorption data for the eight compounds in two concentration ranges at pH 7.0 and 30°C were fit well by both the Langmuir and the Freundlich equations. The adsorptive capacities at pH 7.0 increase from pentachlorophenol to trichlorophenols and are fairly constant from trichlorophenols to monochlorophenols. Equilibrium measurements were also conducted for 2,4,5‐trichlorophenol, 2,4‐dichlorophenol, and 4‐chlorophenol over a wide pH range. A surface complexation model has been proposed to describe the effect of pH on adsorption equilibria of chlorophenols on activated carbon. Activated carbon surface functional sites are divided into acidic and basic groups with which molecular and ionized forms of chlorophenols interact, respectively, and form two neutral complexes. The simulations of the model are in excellent agreement with the experimental data.