Heterogeneous photo-Fenton process for degradation of azo dye: Methyl orange using a local cheap material as a photocatalyst under solar light irradiation

The results indicate that the photodegradation rate of MO clearly increased in the presence of clay when compared with the direct photolysis for a concentration of substrate of 10−4 mol/L, the optimal conditions for a better degradation were obtained for ([clay] = 1 g/L and pH = 3 in the presence of [oxalic acid] = 10−2 M).