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T. D. Khokhlova, Le Thi Hien
Adsorption of
dyes on activated carbon and graphitized thermal carbon black
Abstract
Adsorption
of acid and basic dyes – acid orange 2 (AO) and methylene blue (MB) on three
activated carbon (AC)
– FAS, SKD and BAU different in porous structures and ion-exchange groups
concentration, as well as on graphitized thermal carbon black (GTCB) was
studied. The effective specific surface areas of AC, estimated by means of dye
adsorption are nearly of 60, 50 и 40 %, respectively, of the areas,
determined by BET nitrogen adsorption. Adsorption on AC and GTCB
of the acid dye increases and of the basic dye decreases with reduction of pH
value. Addition of 0.3 N NaCl to the solutions does not effect on adsorption of
dyes on AC and GTCB. It is assumed, that the basic contribution to adsorption
of dyes on AC is brought with hydrophobic interactions instead of ionic.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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