Applicability of equilibrium and kinetic models on the herbicide 4-chloro-2-methyl phenoxyacetic acid adsorption on bituminous shale

• Authors: Nihat Ayar , Binay Bilgin , Gülten Atun
• Languages of publication: EN

Abstracts

EN

Adsorption characteristics of herbicide 4-chloro-2-methylphenoxyacetic acid (MCPA) have been evaluated using bituminous shale (BS) as a model adsorbent-containing solid organic matter in a mineral matrix. The adsorption of MCPA on BS has been studied with varying concentration, temperature, pH and contact time, using batch technique. Adsorption ability of BS increases with increasing temperature and decreasing pH in the studied concentration range of (0.6–4.0) × 10−4 M. Theoretical curves calculated from Freundlich, Dubinin-Radushkevich (D-R), Langmuir and Temkin isotherm equations show a two-step isotherm shape. The results could be explained by assuming the presence of two-type sites with different affinity on adsorbent surface. Adsorption process is endothermic and entropy controlled at the first stage, and exothermic and enthalpy controlled at the second stage. The mechanism proposed based on surface ionization and complexation model is consistent with the pH dependent experimental results. Kinetic data fit well to both Paterson’s and Nernst Planck model based on homogeneous solid phase diffusion (HSPD). The values of particle diffusion coefficients (D p ) predicted from both models are comparable each other and independent of temperature and concentration. [...]

Keywords

EN

MCPA; Bituminous shale; Adsorption kinetics; Paterson’s equation; Nernst-Planck equation

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2008
• Volume: 6
• Issue: 2
• Pages: 284-292

Dates

published

1 - 6 - 2008

online

17 - 4 - 2008

Contributors

author

Nihat Ayar

• Department of Chemistry, Faculty of Engineering, Istanbul University, 34320, Avcilar-Istanbul, Turkey

author

Binay Bilgin

• Department of Chemistry, Faculty of Engineering, Istanbul University, 34320, Avcilar-Istanbul, Turkey

author

Gülten Atun

• Department of Chemistry, Faculty of Engineering, Istanbul University, 34320, Avcilar-Istanbul, Turkey

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Identifiers

DOI

10.2478/s11532-008-0022-7