Abstract
Nitrogen-doped ZnWO4 nanoparticles have been synthesized by a sol–gel method using sodium tungstate and zinc acetate in the presence of urea to supply nitrogen. This photocatalyst was characterized by X-Ray diffraction (XRD), field emission-scanning electron microscopy (FESEM), transmission electron microscopy (TEM), an energy dispersive X-ray spectrometer (EDS), the Brunauer–Emmett–Teller technique (BET), photoluminescence (PL) spectroscopy and UV–vis diffuse–reflectance spectrum (DRS). The band gap energy of N-doped ZnWO4 was about 2.99 eV and the absorption wavelength shifted to the visible region in comparison to pure ZnWO4. Also, N-doped catalyst shows enhanced photocatalytic activity for the degradation of methylene blue (MB). The apparent photodegradation rate constant (k) of N-doped ZnWO4 was observed 3.57 × 10−2 min−1 under visible light irradiation.
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