TITLE:
Adsorption Kinetics and Mechanisms of Cypermethrin and Dichlorovos on Heterogeneous Activated Carbon Porous Media
AUTHORS:
Atulegwu Patrick Uzoije, Clifford O. Kamalu, Uzuakpundu Basil
KEYWORDS:
Adsorption Kinetic Models, Diffusion, Dichlorovos, Cypermethrin, Equilibrium, Isotherms
JOURNAL NAME:
Open Access Library Journal,
Vol.2 No.11,
November
18,
2015
ABSTRACT: 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.