Comparison of gel anion exchangers of various basicity in direct dye removal from aqueous solutions and wastewaters
2011
Wawrzkiewicz, Monika
The goal of this paper is to study the effectiveness of the weakly (Amberlite IRA 67) and strongly (Amberlite IRA 458) basic gel anion exchangers of polyacrylic matrix in Direct Red 75 (DR75) removal from aqueous solutions and wastewaters. The monolayer sorption capacities Q₀ determined from the Langmuir isotherm model for the weakly and strongly basic anion exchangers were found to be 994.9 and 430.8mg/g, respectively. For comparison, a low cost sorbent prepared from orange peels exhibited low affinity for the dye, Q₀ equals 74.1mg/g. The presence of inorganic salts such as NaCl, Na₂CO₃ and Na₂SO₄ as well as the non-ionic surfactant exhibited only minor effects on the dye sorption. The uptake of DR75 was remarkedly reduced in the presence of the cationic surfactant. The sorption of DR75 on the anion exchangers was pH independent. The kinetics fitted the pseudo-second order rate expression. With the decreasing particle sizes of anion exchangers, the increase in dye loading was observed. Almost 60% of dye can be desorbed from Amberlite IRA 67 using 1M NaOH in 40% methanol.
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