Green-Synthesized Nickel-Doped Strontium Oxide Nanocomposite for Efficient Catalytic Degradation of Naphthol Blue Black Dye

Abstract

Naphthol Blue Black is an organic contaminant that is produced by the wood, textile, and dye industries. Many studies have been undertaken to investigate the cleanup of Naphthol Blue Black from industrial effluents. SrO nanoparticles are now being utilized to remove Naphthol Blue Black colours from water. We used a green synthesis to create strontium oxide nanoparticles for photocatalytic NBB breakdown under light conditions. To enhance the solar light activity and avoid charge recombination, we employed a green synthesis from albizia amara leaves extract to add Ni as a dopant in strontium oxide nanoparticles. Strong base NaOH, nickel nitrate, and strontium nitrate were used as precursors. The nanoparticles were crushed into powder and calcined at 450 °C in a muffle furnace to produce SrO and Ni-doped SrO nanoparticles. The nanoparticles were analysed using several analytical methods to determine their morphological and structural properties. At 309, 312, and 317 nm, UV-Vis spectroscopy showed absorbance values of SrO doped with nickel. The Ni–O stretching peak was identified in the FTIR analysis of strontium oxide nanoparticles at 402 cm-1 and 581 cm-1 , whereas the Sr–O bond gave a signal at 854.84 cm-1 . SEM images of Ni-doped SrO nanoparticles were created at various magnifications. The nanostrips are hexagonal and cylindrical. Sherrer's equation was used to compute the average crystalline structure, which showed that the diameters of pure and Ni-doped SrO nanoparticles were 44.84 and 42.93 nm. According to the EDX examination, Ni-doped SrO is about 70 % Sr and oxygen, with around 1.34 %Ni. The resulting sample was tested for photocatalytic degradation of Naphthol Blue Black, and the completion of the reaction was monitored using UV-visible spectroscopy to measure the % photocatalytic degradation during light illumination. According to the UV-visible spectra, 90% of the dye was effectively destroyed.