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In this study, graphene oxide (GO) sheets were synthesized by using a modified Hummers׳ method and Offeman׳s method. The GO was mixed with ZnSe prepared using various amounts of N2H4 at a ratio of 1:1 to form precursors. The ZnSe/graphene nanocomposites were synthesized under hydrothermal conditions (180°C; 12h) from the previous precursor. The obtained ZnSe/graphene photocatalysts were characterized by UV–vis spectroscopy, transmission electron microscopy (TEM), photoluminescence (PL) spectroscopy, X-ray diffraction analysis (XRD), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). Photocatalytic activity under visible-light irradiation was evaluated in a methylene blue (MB) dye degradation reaction in the aqueous phase.
The results show that the ZnSe–N2H4 reacted with the GO, possibly because the N2H4 contained in the ZnSe reduced the GO to graphene and formed a ZnSe/graphene nanocomposite. The GN-5-mL ZnSe nanocomposite prepared in this study could degrade more than 90% of the MB in 2h and almost completely degrade the MB in 4h under visible-light irradiation. The degradation efficiency of the ZnSe/graphene nanocomposite was 99.6% after 6h of visible light irradiation; the pseudo-first-order reaction rate constant of the ZnSe/graphene nanocomposite was 1.27h−1.