Adsorption coupled photocatalytic degradation of dichlorvos using LaNiMnO6 perovskite nanoparticles supported on polypropylene filter cloth and carboxymethyl cellulose microspheres

Increasing pesticide application and improper wastewater disposal methods contaminate water resources and severely affect the ecology as well as environment. The present study is focused on the adsorption coupled photocatalytic degradation of dichlorvos using UV light in presence of LaNiMnO6 perovskite nanoparticles (Prv) supported on polypropylene filter cloth (PPPrv) and carboxymethyl cellulose (CMCPrv) microspheres. The synthesized LaNiMnO6 perovskite nanoparticles were characterized by XRD, FT-IR, SEM and EDX. The adsorption percentage of DCV followed the order: CMCPrv (62.7%) > PPPrv (46.1%) > Prv (32.6%). Equilibrium studies suggested the heterogenous mode of adsorption. Pseudo-first order exhibited the good linearity indicating the involvement of physical forces. Thermodynamics showed an endothermic and spontaneous nature of adsorption. The influences of various photocatalytic parameters viz., pH, irradiation time, initial DCV concentration, Prv loading and catalyst dosage on DCV degradation were investigated. Ex situ studies conducted for 8 h of sunlight exposure showed complete degradation of DCV present in industrial wastewater which was confirmed by GC-MS analysis. The advantage of CMCPrv as supported catalyst is the easy separation and reuse for four cycles. The present work is the first report that signifies the potential efficacy of CMCPrv to serve as an effective remedial agent for DCV removal from contaminated water.