Preparation and Spectrochemical characterization of Ni-doped ZnS nanocomposite for effective removal of emerging contaminants and hydrogen Production: Reaction Kinetics, mechanistic insights.

In this study, we report the successful synthesis of Ni-doped ZnS nanocomposite via a green route using ethanolic crude extract of Avena fatua. The as-synthesized nanocomposite was comprehensively characterized using Dynamic light scattering (DLS), Zeta potential, scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and Atomic force microscopy (AFM). These analyses provided detailed insights into the size, morphology, composition, surface properties, and structural characteristics of the nanocomposite. Subsequently, the synthesized nanocomposite was evaluated for their photocatalytic performance against the organic dye Methyl orange. Remarkably, the nanocomposite exhibited rapid and efficient degradation of Methyl orange, achieving 90 % degradation within only 30 min of irradiation under UV light. Moreover, the photocatalyst demonstrated an exceptional hydrogen production rate, reaching 167.73 µmolg-1h-1, which is approximately 4.5 times higher than that of its pristine counterparts. These findings highlight the significant potential of Ni-doped ZnS nanocomposite as highly efficient photocatalysts for wastewater treatment and hydrogen production applications.

An investigation on optical characteristics of nanocrystalline ZnS:Ni thin films prepared by chemical deposition method.

Nanocrystalline nickel doped ZnS (ZnS:Ni) thin films were deposited by chemical bath deposition method. The effect of Ni doping on structural, photoluminescence, and optical properties of the ZnS:Ni films was studied. Structural analysis using X-ray diffraction revealed that the films are polycrystalline in nature with a cubic structure. The fluorescence (FL) spectra of the ZnS:Ni films showed two characteristic bands, one broad band centered at 430 and another narrow band at 523 nm. UV-vis transmission data showed that the films were transparent in the visible region. Also, using these data, the absorption coefficients, the optical band gap, the extinction coefficients, the refractive index, the real and imaginary parts of the dielectric constants, and the dissipation factor were calculated.