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Adsorption kinetics and mechanism of Cypermethrin (CY) and Dichlorovos (DI) on activated carbons of oil bean seed shell (OBSS), unripe plantain peel (UPP) and castor bean seed shell (CBSS) systems have been studied. The equilibrium adsorption isotherms were modelled by Freunlich, Langmuir and Langmuir-Freunlich (LF) models. Adsorption isotherms of various systems were best described by Langmuir-Freunlich (LF). Mixed 1,2 order equation (MOE), integrated kinetic Langmuir (IKL), pseudo second order equation (PSOE), fractal-like mixed 1,2 order equation (F-MOE), and Boyd and Webbers models were compared and adopted in the analysis of the kinetic data. The models represented different uptake reduction rate of CY and DI by various adsorption systems. F-MOE, IKL and MOE models were in agreement with CY/OBSS, CY/UPP and CY/CBSS system data respectively, hence the conforming models, whereas IKL, MOE and PSOE were the conforming models for DI/OBSS, DI/UPP and DI/CBSS adsorption data systems, respectively. The two diffusion models (Boyd and Webbers) applied confirmed film diffusion pattern as prevailing transportation pathway for CY and DI onto the adsorbents.

Adsorption Kinetics and Mechanisms of Cypermethrin and Dichlorovos on Heterogeneous Activated Carbon Porous Media