Nickel tungstate semiconductor nanomaterials have shown their applications in energy conversion and photo-degradation of organic dyes owing to its low band gap, high mechanical stability and abundant oxygen sites for dye molecule absorption. Nanoparticle nickel tungstate doped with different transition metals has been synthesized by co-precipitation methods with thermal treatment. Synthesized samples were examined using X-ray diffraction (XRD), transmission electron microscopy (TEM), dynamic light scattering (DLS) and X-ray photoelectron spectroscopy (XPS) methods. A series of photodegradation reactions were performed to assess the change in efficiency based on the doping metals (Fe, Co, Cu, Zn) and doping level of the samples. We find that doping tends to improve photodegradation rates, while the effect is different for each type of dopant. Theoretical calculations were also performed to investigate the electronic effects of doping and the nature of the valence band edge and conductance band edge.

Nickel tungstate doped with transition metals for photo-degradation of organic compounds

ACS Fall 2021

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