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In this research, zinc oxide (ZnO) nanostructure was prepared by using zinc acetate (as precursor) and carboxylic derivative of activated carbon (as matrix). Activated carbon was modified by oxidation with nitric acid to get carboxylic derivative (AC-COOH). Then, zinc was loaded on the surface of modified activated carbon by an impregnation method. The ZnO nanostructure was characterized by BET, XRD and SEM that confirmed achieving of ZnO nanoparticles with a size of 21-31 nm and surface area of 17.78 m 2 gr −1. The efficiency of the catalyst was evaluated in the photocatalytic decomposition of aqueous solution of azo dye methyl orange (MO). Major parameters such as pH, dose of catalyst, stirring effect, initial concentration of dye and solution oxygen effect were considered. Activity measurements under UV radiation showed acceptable results for the photodegradation of MO. The efficiency of catalyst prepared with non-modified activated carbon for the photodegradation of MO was also evaluated. The results confirmed that ZnO prepared using carboxylic derivative of activated carbon as matrix had better photocatalytic activity than ZnO prepared by non-modified carbon matrix.

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Zinc oxide and gold-zinc oxide (Au-ZnO) nanostructures with multiple rods (multipods) morphology were successfully prepared. Au-ZnO nanostructures were synthesized via a simple precipitation route method in the presence of oligoaniline-coated gold nanoparticles. The Au-ZnO catalyst obtained was applied for the degradation of methyl orange in an aqueous solution under UV irradiation. Effects of the operational parameters such as the solution pH, amount of photocatalyst, and dye concentration on the photocatalytic degradation and decolorization of methyl orange were studied. Detailed studies including kinetic study and regeneration of catalyst were carried out on the optimal conditions for the photodegradation of methyl orange by Au-ZnO multipods in aqueous solution. Effect of foreign species on the photodegradation of methyl orange was also studied. An enhancement of the photocatalytic activities for photodegradation of methyl orange was observed when the gold nanoparticles were loaded on the zinc oxide multipods. The proposed catalyst was applied for the degradation of methyl orange in synthetic wastewater samples with satisfactory results.

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