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Photocatalytic CO 2 reduction into hydrocarbon fuels over photocatalysts has hypothetical and reasonably developed into a trendy exploration topic. In this study, the progress of the quaternary nanocomposite containing a graphene-based catalyst was reported; this was fabricated using the hydrothermal technique. The analysis of physical characteristics of the nanocomposite confirmed the interaction between all parts. The quaternary nanocomposite containing the graphene-based catalyst was utilized for carbon dioxide reduction to methanol (CH 3 OH) under light irradiation. Titanium dioxide (TiO 2 ) and the quaternary nanocomposite of AgCuInS 2 were monotonously spread on the graphene exterior. This nanomaterial showed superior activity compared with TiO 2 and the binary composite for CO 2 conversion, and the obtained result indicates that the synthesized ternary composite enhaces the properties of the photocatalyst in the reduction process.

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