Photocatalytic and Antimicrobial Performance Evaluation of Reusable MoS₂ Nanoflowers under Visible Light

Abstract

2D semiconductor material, Molybdenum Disulfide (MoS 2 ), with unique properties similar to that of graphene, is considered as a potential candidate for photocatalytic and antimicrobial applications. In the current work, MoS 2 was prepared by a simple hydrothermal method using sodium molybdate and thiourea as precursors. The calculated band gap values of MoS 2 grown at 200 °C and 180 °C were 2.1 eV and 1.98 eV, respectively. Flower like morphology was observed from FESEM analysis. Multi layered structure of MoS 2 was confirmed from the difference the peak value obtained for A 1g and E 1 2g vibrational modes observed from Raman spectra. The reusability of the synthesized MoS 2 was analyzed against MB dye degradation. The pristine MoS 2 removed ∼98% of the dye molecules from the water under the minimum wattage (20 W) of visible light in 180 min. The catalyst retained good stability even after the third degradation, confirming the reusability of MoS 2 . The disk diffusion method was used to evaluate the antimicrobial activity of the grown MoS 2 nanostructures. The gram-positive and gram-negative bacteria used in present study were Staphylococcus aureus, Klebsiella pneumoniae, Escherichia coli and Bacillus serius . Investigation of the antibacterial activity of MoS 2 against these four different pathogens was carried out in detail and the resistance function was measured.