Decolorization of Dye Wastewater by Activated Carbons Produced from Peanut Shell using ZnCl2 Impregnation Method
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Abstract
This study assessed the adsorption capacity of different activated carbons produced from peanut shell for S3B dye (Sunfix Red 150%) present in dye wastewater under different contact conditions. The pre-impregnation of input material by ZnCl2 (weight ratio 1:1) increased surface charge of produced activated carbon to positive value; While activated carbons produced from non-impregnation and post-impregnation procedures had negative charge. The optimal adsorption conditions were at pH 5 with 10 g/L activated carbon in original dye wastewater , for 180 minute contacting time. Under the optimal conditions, pre-impregnated activated carbon had highest adsorption capacity, corresponding to80.2% S3B dye removal; while the two other types of activated carbons obtainedabout 40% dye removal. The adsorption process suited to Freundlich isotherm model (multilayer adsorption) with KF adsorption constants being 0.0377, 0.3314 and 0.0523 for non-, pre- and post-impregnated activated carbons, respectively.
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