|representative azo dye Acid Orange 7 (AO7) in aqueous medium under natural sunlight
without addition of any external reagents like peroxides, acid or base. The effects of calcination temperature, pH of the medium,
catalyst dosage and irradiation time on the decolorization of AO7 were investigated. Sm3+ doping in CeO2 narrowed the band gap and
significantly enhanced the photocatalytic degradation of the azo dye. The photocatalytic degradation of AO7 is also investigated by
using certain radical scavengers and the results suggest that under solar-light irradiation predominantly positive holes and super
oxide radicals (O2• −) act as the active species in the degradation process. Our results suggest these materials developed here are
promising alternative solar light sensitive photocatalyst. More in DOI: 10.1039/C5RA03758A, RSC Adv., 2015,5, 43081-43091.
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