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KMID : 1059520100540010110
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Journal of the Korean Chemical Society
2010 Volume.54 No. 1 p.110 ~ p.114
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Competitive Adsorption of Two Basic Dyes RB5 and GB4 on a Local Clay
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Elaziouti A.
Z. Derriche
Z. Bouberka
Laouedj N.
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Abstract
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The equilibrium of adsorption of basics dyes RB 5 and BG 4 from a single dyes in the mixtures on the sodium-exchanged clay of the Maghnia (Algeria) was studied. The maximum adsorption capacities of BR5 and BG4 in single dyes were 465.13 and 469.90 mg/g respectively. In the simultaneous adsorption of BR5 and BG4 from mixture solutions, three different initials concentrations ratios R (R=C(BR5)/C(BG4)) were tested: 2.5/1, 1/1 and 1/2.5 using ADMI method. The isotherms adsorptions of dyes from the mixtures are characteristics of competition phenomenon. A very strong interaction between BR5 and BG4 for the active sites of adsorption of surface of clay is obtained for R = 1/1. The ratio R’ (R’= Qe (mixture)/Qe (single)) of the adsorption capacity of BR5 and BG4 in the mixture were reduced by factor of 0.86, 0.74 and 0.84 for the initials concentrations ratios R (R= C(BR5)/C(BG4)) of 2.5/1, 1/1 and /2.5 respectively. The variation of the ratio of the adsorption capacity R’ of BR5 and BG4 in the mixture solutions with initial concentration ratios R indicates that BR5 dye is slightly favourable in the competition adsorption than BG4. Langmuir and Freundlich models fit very well with adsorption behaviour of single dyes as well as the dyes in mixture solutions.
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KEYWORD
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Sodium-exchanged clay, Adsorption, Kinetics, Isotherm, BR5 and BG4 dyes, Competition
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