Centella asiatica Leaf Extract Mediated One-Pot Green Synthesized rGO Decorated PbS/CdO Nanocomposite for Catalytic Degradation of Methyl Violet from Wastewater and Resistance Against Bacillus subtilis and Pseudomonas aeruginosa Bacterial Strains

By using Centella asiatica leaf extract, reduced graphene oxide (rGO) decorated PbS/CdO nanocomposite (rPC) was synthesized by reducing graphene oxide. To investigate the photocatalytic, electrochemical, and antibacterial properties of the synthesized rPC NC, different analytical techniques were employed and compared with those of the PbS/CdO NC synthesized by chemical precipitation. The XRD analysis of both samples revealed cubic structured peaks of PbS and CdO. Pb, S, Cd, O, and C can be detected from rPC’s EDS spectrum. PC and rPC exhibited band gap energies of 2.28 and 2.21 eV, respectively. Both samples show FTIR peaks related to lead sulfide and Cd–O stretching vibrations. Interstitial sulfur and singly occupied oxygen vacancy peaks are evinced in the PL spectra. The PL intensity for rPC is reduced, which is indicative of low recombination rates for photogenerated e − /h + pairs. Photodegradation efficiencies against methyl violet were 81.2 and 93.4% for PC and rPC catalysts. Electrochemical and antibacterial properties of PC improved with rGO inclusion.