Dye removal from wastewater by adsorption on ‘waste’ Fe(III)/Cr(III) hydroxide

Abstract Agricultural and industrial solid wastes can be recycled as nonconventional adsorbents if they are inert and harmless to reduce the cost of the wastewater treatments. Waste Fe(III)/Cr(III) hydroxide, generated in the treatment of Cr(VI) bearing wastewaters in a fertilizer industry, was used for the adsorption of Congo red (direct dye) from aqueous solution. The parameters studied include agitation time, initial dye concentration, pH and adsorbent dosage. The adsorption capacity was evaluated by using both the Langmuir and Freundlich adsorption isotherm models. Removal of the dye was maximum, 91% at pH 3. Low desorption (9%) with water seems to indicate that the dye is mostly held by the adsorbent through ion-exchange.

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