13. Zinc Sulphide Nanoparticles as a Bacteriostatic and Invigorated Catalytic Tool for Multiple Dye Degradation: An Approach Towards Environment Remediation

The objective of this research is to assess a green strategy to synthesize multifunctional Zinc sulphide nanoparticles (ZnS-NPs), a material that has attracted significant attention in recent years. An aqueous extract of Girardinia diversifolia (G. diversifolia) leaves was utilized to form ZnS nanoparticles and their properties were evaluated using various analytical techniques such as UV-Vis, Tauc plot, XRD, FTIR, EDX, and TEM. The extract’s phytoconstituents serve as a reducing and capping agent, as determined by FTIR. UV spectrum exhibited a peak near 262.31 nm, which is corresponding to characteristic peak of ZnS nanoparticles. ZnS-NPs are cubic crystalline in nature as shown by XRD investigation. Moreover, morphological examinations using TEM and EDX revealed that the integrated spherical particles (11.28 nm particle size) are largely constituted of Zinc (52.38%) and Sulphur (31.23%). The as-prepared ZnS-NPs show potential antibacterial abilities against 5 bacterial strains in this investigation and the maximum zone of inhibition were determined using agar well diffusion method. ZnS-NPs acted as an efficient catalyst for the degradation of hazardous dyes (4.124 eV band gap energy). The dye degradation of Methylene blue (MB), Acridine orange (AO), and Rose bengal (RB) was examined utilizing nanoparticles. As a result, the ZnS-NPs produced in this study are appropriate for industrial wastewater treatment. Increased reaction rate as well as % degradation efficiency were attained by increasing the concentration of dye.