Abstract
Heterogeneous dark Fenton and photocatalytic degradation of azo-dye chrysoidin were studied using natural marmatite from a Colombian gold deposit as catalysts. Marmatite is composed of zinc sulfates, iron sulfates and iron oxides; due to this composition marmatite is an active material in the degradation of chrysoidin. Marmatite was characterized by SEM, XRD, BET and XRF. Experimental results allow concluding that the dye was oxidized (degraded) in both, heterogeneous Fenton and photo-catalyst reactions, using Marmatite as catalyst. The variables considered were solution pH, marmatite concentration, CH2O2 initial concentration and light irradiation source. Dye elimination was 96% after 1 h in the best case at pH 3, dye concentration of 0.1 mM, 0.2 g/L of marmatite, room temperature, H2O2 concentration of 10 mM and exposure to germicide light. The heterogeneous Fenton reaction provided more than 50% of discoloration in 1 h for marmatite under appropriate conditions, evidencing catalyst efficiency.
© 2016 by Walter de Gruyter Berlin/Boston
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