Abstract
The pristine ZnO and ZnO-Graphene hybrid composites at various graphene ratios were synthesized via facile ultrasonic assisted solution approach. The crystal structure is identified by powder XRD technique and disclosed the hexagonal wurtzite structure. The synthesized ZnO exhibited uniform spherical like morphology with low degree of aggregation. The formation of hybrid composite of graphene and ZnO could improve the light absorption ability and separation of photo generated carriers of ZnO, which is confirmed through photoluminescence and UV–Vis DRS analysis. The photo catalytic degradation of Crystal violet, Cr (VI) and 2, 4 D were evaluated under visible light irradiation. The Zn-Graphene hybrid composite exhibited higher photo catalytic activity towards CV dye, Cr (VI) and 2, 4-D, such as high photo degradation efficiency and good stability than bare ZnO. This could be due to the high surface area and synergic effect between the graphene and ZnO p–n junctions. The mechanism of enhanced photo catalytic activity of Zn-Graphene composite discussed in detail.
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