A simple strategy for synthesizing copper tungstate nanoparticles with enhanced chemocatalytic degradation
DOI:
https://doi.org/10.62638/ZasMat1830Abstract
The ever-increasing demand for efficient and sustainable catalytic systems has promoted a surge in the exploration of transition metal nanoparticles as catalysts for various chemical reactions. CuWO4 nanoparticles were formed by co-precipitating copper chloride and sodium tungstate in a 1:1 molar ratio. The nanoparticles were characterized extensively by using various techniques including, X-ray diffraction (XRD), Raman Spectroscopy, Fourier transform infrared (FTIR) spectroscopy, Ultraviolet-visible diffuse reflectance spectroscopy (UV-DRS), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), Energy Dispersive Spectroscopy (EDS) and Photoluminescence (PL) measurements. The XRD and RAMAN studies revealed the presence of water molecules in the lattice of the as-synthesized and sample heat treated at 300 °C, indicating that the material is copper tungstate dihydrate (CuWO₄·2H₂O) with a monoclinic structure. In contrast, the samples heat-treated at 400 °C, 500 °C and 600 °C exhibited an anorthic (triclinic) structure of CuWO4.XRD data was used to calculate the average grain size and lattice parameters. The FT-IR analysis confirms the formation CuWO4 nanoparticles. The Diffuse reflectance ultraviolet-visible spectroscopy, the obtained band gaps of nanoparticles ranging from 2.9 to 2.2 eV, measured using the Kubelka and Munk method. The Brunauer-Emmett-Teller (BET) specific surface area analysis provided insights in to availability of active surface sites in CuWO4 nanostructures. Elemental analysis and chemical composition of CuWO4 were determined using X-ray photoelectron spectroscopy (XPS) and Energy Dispersive Spectroscopy (EDS), which confirms the presence of peaks corresponding to W, O, and Cu only. Photoluminescence (PL) studywith an excitation wavelength of 290 nm reveals that for all the samples the emissions appeared at wavelengths between 400 and 500 nm. The catalytic activity of CuWO4 nanoparticles was assessed by measuring the breakdown of the methylene blue dye. This study reports a novel synthesis of CuWO4 as an efficient chemocatalyst, achieving a catalytic degradation of approximately 98.3%, which can have potential applications in wastewater management.
Keywords:
Copper tungstate, Chemocatalysis, Co-precipitation method, XRD, UV-Vis, BET, XPSReferences
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