Adsorption‐desorption characteristics of some phenoxyacettc acids and chlorophenols in a volcanic soil I. Equilibrium and kinetics

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Abstract
The equilibrium and batch kinetic adsorption‐desorption characteristics of 2,4‐dichlorophenoxyacetic acid (2,4‐D), 2,4,5‐trichlorophenoxyacetic acid (2,4,5‐T), 2‐methyl‐4‐chloro‐phenoxyacetic acid (MCPA), 2,4‐dichlorophenol (2,4‐DCP), 2,4,5‐trichlorophenol (2,4,5‐TCP) and para ‐chloro‐ortho‐cresol (PCOC) in a volcanic soil were investigated. Freundlich type isotherms were used to describe the equilibrium data. The film transfer coefficients were determined from the batch adsorber initial uptake rate data. The kinetic experiments were satisfactorily analysed by a surface diffusion model and the results indicated that for each compound, the adsorption and desorption diffusion coefficients were of the same order.