Nitrogen doped carbon quantum dots and GO modified WO nanosheets combination as an effective visible photo catalyst.

Nitrogen doped carbon quantum dots (NCQDs) based highly efficient ternary photocatalyst are fabricated by modifying surface of GO incorporated WO nano-sheets. XRD confirmed the formation of monoclinicWO nano-sheets. All the characteristic peaks of WO, GO and NCQDs are obvious in XRD patterns of WO/GO/NCQDs ternary photocatalysts confirming successful fabrication of the photocatalysts. SEM images showed that WO host matrix is distorted after incorporation of GO and NCQDs owing to lower interfacial tension. The surface of WO nano-sheets is modified with morphological defects making more active sites available. UV-vis spectra exhibited extended visible light absorption and remarkable reduction of WO band gap energy. The photoluminescence spectra confirmed the efficient charge separation in NCQDs modified ternary photocatalyst. The synthesized composites were applied for the photocatalytic degradation of harmful organic dye i.e. methyl orange (MO). The ternary composites represented the excellent photocatalytic activity as compared to binary and pure WO photocatalysts. This enhanced photocatalytic activity is attributed to the availability of active sites, extended light absorption in visible region and enhanced charge separation efficiency.