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A novel g-C 3 N 4 /ZnO-TiO 2  nanocomposite was prepared by facile calcination and hydrothermal assisted route to boost the photocatalytic efficiency of g-C 3 N 4 . The structural, morphology and optical properties of as-obtained nanocomposites (NCs) were examined by various physicochemical methods such as XRD, FT-IR, FESEM-EDX, HR-TEM, UV-DRS and PL spectra relatively. The as-obtained g-C 3 N 4 /ZnO-TiO 2  heterojunction NCs displays an optimum efficiency (93.6%) and high photo-degradation rate constant towards the photo-degradation of RhB dye in 75 min under visible-light exposure. Likewise, the synergistic effects on heterostructure strong-coupling interfaces assembly of g-C 3 N 4  and TiO 2 /ZnO NPs, which facilitates the excellent photo-excited charge separation efficiency, suppressing the recombination rate and also widening the visible-light fascination ability. Hence, the resulting in a prolonged lifetime leading to continuous generation of h +  and  • OH −  species which were eventually improved the photo-degradation process. Also, the as-obtained hybrid g-C 3 N 4 /ZnO-TiO 2  photocatalysts (PCs) revealed superior recycling stability. Moreover, a probable photocatalytic reaction mechanism of the novel PCs was also suggested.

Facile construction of novel ZnO and TiO 2 combined g-C 3 N 4 nanocomposite for superior visible-light photocatalytic organic pollutant degradation