Abstract
Copper Tungstate-Graphene Oxide nano composites have been successfully applied as excellent catalysts for the photocatalytic degradation with Methylene blue and Malachite green dyes under visible light irradiation. A facile solid state metathesis synthesis of copper tungstate (CuWO4) followed by ball milling and subsequent preparation of copper tungstate-graphene oxide (CuWO4-GO) nano composite using a colloidal blending process and its application as a visible light photocatalyst for the degradation of Malachite green and Methylene blue dyes. The morphology and composition of copper tungstate (CuWO4) nano composite have been characterized using X-Ray Diffraction (XRD), UV-Visible Diffuse Reflectance Spectra (UV-DRS), Raman Spectra, Field Emission Scanning Electron Microscopy (FESEM)-EDS and UV Visible Spectroscopy. It shows a band gap value of 2.13 eV, an increase in range and intensity of light absorption and the reduction of electron-hole pair recombination in CuWO4 with the introducing of GO on to it.
Highlights
Copper Tungstate-Graphene Oxide nano composites have been successfully applied as excellent catalysts for the photocatalytic degradation with Methylene blue and Malachite green dyes under visible light irradiation
While a distinct peak for pure graphene oxide was observed at 2θθ = 10.2 ̊ (Figure 2), this Graphene oxide (GO) related peak is not observed in CuWO4-GO plot due to the low amounts of GO and the resultant low diffraction intensity that would be below the limit of detection of the instrument [23]
The photo catalytic activity of the nanoCuWO4-GO composite was investigated towards the degradation of organic dyes Methylene blue (MB) and Malachite green (MG) under visible light irradiation is represented in Figure 13 shown in comparison with micro and nanoCuWO4
Summary
The reasons for these improvements are attributed to the fact that copper tungstate has a direct band gap positioned near the optical value of the solar spectrum and high energy of CB (Conduction Band), giving the photo electrons to a strong reducing ability and graphene oxide possesses a remarkable electrical transport property [23]. The photo catalysis has been performed to study degradation of Methylene blue and Malachite green dyes by the prepared materials
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