Effective removal of dichlorvos from aqueous solution using biopolymer modified MMT–CuO composites: Equilibrium, kinetic and thermodynamic studies

摘要: Abstract In the present study, adsorption experiments were carried out with dichlorvos (DCV), an organophosphate insecticide using biopolymer modified montmorillonite (MMT)–CuO composites viz. MMT–CuO–Chitosan (Ch), MMT–CuO–Gum ghatti (Gg), and MMT–CuO–Poly Lactic acid (PLA) along control (MMT–CuO). Optimization of parameters viz., pH (3.0–12.0), contact time (1–12 h), temperature (20–50 °C), initial DCV concentration (20–100 mg L− 1) composite dosage (0.5–3.0 g L− 1) was done during process. The removal found to be maximum in case MMT–CuO–Ch (93.4%) followed by MMT–CuO–Gg (87.8%), MMT–CuO (83.2%) MMT–CuO–PLA (63.3%). Equilibrium data showed best fit Freundlich model highest capacity suggesting a heterogenous mode adsorption. This further confirmed SEM analysis. Better applicability pseudo-first order kinetic suggested physisorption as underlying phenomena. Intraparticle diffusion Boyd plot that film not sole rate limiting process for onto composite. Thermodynamic studies spontaneous endothermic nature FTIR analysis major involvement amines alcohol groups EDX participation carbon atom CuO nanoparticles Si thereby all three components AFM homogenous distribution on surface which validated potentiality chitosan effective from aqueous environment.