Improved visible light response photocatalytic activity of CuWO4/g-C3N4 nanocomposites for degradation of organic dyes

In this report, the high performance visible light induced photocatalytic performance of CuWO 4 /g-C 3 N 4 hybrid was photocatalysts by facile hydrothermal method. The structural order of the obtained catalysts was performed through X-ray diffraction and Raman analysis, which exposed the monoclinic phase (JCPDS Card No. 83-0951). The clear sheet like with wrinkle shape and spherical nanoparticles (30–35 nm) was found to be g-C 3 N 4 and CuWO 4 samples, which is obtained by SEM and TEM analysis. The g-C 3 N 4 modified CuWO 4 sample showed huge surface area (108 m 2 g −1 ) and high porous nature (32.53 nm), which is identified by BET method. The significant reduction in the band gap (2.91–2.33 eV) and suppress the recombination rate of electron–hole pairs was also identified by UV–Vis absorption and Photoluminescence spectra results. The optimized ratio (3:1) of composite sample (CWG3) displayed high photocatalytic activity of RhB such as huge efficiency (95%), high first order kinetics (is 0.0913 min −1 ) and long term stability (loss only 3.2). This might be attributed to the coactions between the CuWO 4 nanoparticles over the surface of g-C 3 N 4 nanosheets. Moreover, slighter reduction in the band gap energy and privilege the reduction to the recombination process of electron–hole pairs are the important factors to enhancing the photocatalytic capability of the composite catalysts.