Facile synthesis and characterization of WO3/CuWO4 nanocomposites for the removal of toxic methylene blue dye

Pure tungsten oxide (WO 3 ) nanoparticles (NPs) and WO 3 /copper tungstate (CuWO 4 ) nanocomposites (NCs) were prepared by varying copper content from (5–20 wt%) via the co-precipitation process. XRD results reveal that the structural parameters of WO 3 /CuWO 4 NCs have been strongly affected via Cu doping. Morphology of synthesized WO 3 was noticed to be distinct and particle size was significantly reduced through Cu doping confirmed by employing HRTEM studies. Elemental purity of as synthesized products, elucidated from EDX and XPS analyses, reveals that WO 3 /CuWO 4 nanocomposites contain W, O and Cu elements only. Also, FT-IR spectra and its corresponding assignments indicate the existence of WO 3 /CuWO 4 . UV-Visible study shows that WO 3 /CuWO 4 composites have narrow bandgap compared to pure WO 3 . Photoluminescence spectral peaks intensity of NCs displays a decreasing trend, which supports the enhanced photocatalytic activity. The results clearly show that 20 wt% Cu incorporated WO 3 sample exhibits better photocatalytic nature than that of pure WO 3 and will be more applicable in purify the water.