Chitosan-grafted β-ketosulfones@naphthalene and pyridine molecules/Ag nanocomposites for the catalytic degradation of organic pollutants

Abstract

By employing the abbreviations (Cs-β-KS) naph and (Cs-β-KS) pyr, respectively, the current research investigates the production and characterisation of two novel chitosan-grafted β-ketosulfone derivatives involving naphthalene and pyridine constituents. In the specific case of chitosan-grafted naphthalene derivatives, the impact of preloaded Ag NPs on the catalytic capabilities of such contaminants was also investigated. (Cs-β-KS)naph/Ag was used to demonstrate the catalytic devaluation of p-NP, along with facilitating the catalytic discoloration of CR, MeO, and ArO. Exposure to Ag nanoparticle-laden (Cs-β-KS)naph/Ag resulted in peak absorption of CR, MeO, and ArO at 480 nm, 460 nm, and 480 nm, respectively, disappearing after 15 min, 50 min, and 60 min, respectively. The results indicated that the primary factors, initial concentration, and further research all had a direct effect on their ability to adsorb. Reduction-inducing reactions occur in the method of removal, which aligns with pseudo-second-order kinetics theories. The maximum reduction reaction was anticipated by the pseudo-second-order approach which served as an ideal match to the empirical observations. Leveraging an efficient catalyst (Cs-β-KS)naph / Ag nanocomposites facilitated the efficient removal of p-nitro-phenol and dye molecules. The (Cs-β-KS)naph /Ag nanocomposites exhibited superior catalytic effectiveness across the range of synthesised catalysts for the elimination of p-nitro-phenol Congo Red (CR), Methyl Orange (MeO), and Acridine Orange (ArO)in the presence of sodium borohydride, at prominent intervals of 24 min for p-NP and 15 min for CR.