Abstract: A ring-focusing single-mode microwave synthesis method was used to rapidly synthesize a composite photocatalyst of silver-magnesium co-doped ZnO. XRD and SEM were used to characterize the structure and morphology of the synthesized photocatalyst. The photocatalytic degradation of Rhodamine B and oily wastewater by the photocatalyst was investigated. The performance and the mechanism of the reactions were explored. The results showed that the composite photocatalyst synthesized by microwave method had a good photocatalytic performance, and the degradation rate for oily wastewater was better than that of commercial titanium dioxide. After four cycles, the degradation rate of Rhodamine B was still above 92%, indicating that its chemical stability was good.

Key words: microwave method, zinc oxide, photocatalyst, oily wastewater