Iron-loaded Natural Clay as Heterogeneous Catalyst for Fenton-like Discoloration of Dyeing Wastewater

The clay-based Fe-bearing catalyst was succcessfully prepared through ion-exchange reaction and applied as heterogenous calalyst for discoloration of acid fuchsine (AF) in an aqueous solution by Fenton-like reaction Experimental results demonstrated that the AF discoloration ratios Increased by increasing Fe-loaded clay dosage and initial H(2)O(2) concenteration. and by decreasing the pH, respectively. The lower the initial AF concentration. the shorter the reaction time needed to achieve complete discoloration of AF. Comparative studies indicated that AF discoloration ratios were much higher ill presence of Fe-loaded clay and H(2)O(2) than those in presence of H(2)O(2), raw natural clay or Fe-loaded clay only and raw natural clay and H(2)O(2) jointly After AF discoloration, there existed 110 new phases ill the clay samples detected by XRD and no change ill the clay crystal morphology observed by SEM A mechanism proposed suggested adsorption and Fenton-like reaction were responsible for discoloratiori of AF