The removal of phenolic compounds from aqueous solutions by organophilic bentonite

The adsorption of p-chlorophenol ( p-CP) and p-nitrophenol ( p-NP) on organophilic bentonite (dodecylammonium bentonite, DDAB) was studied as a function of solution concentration and temperature. The observed adsorption rates were found to be equal to the first-order kinetics. The rate constants wer...

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Bibliographic Details
Published in:Journal of hazardous materials 2004-09, Vol.113 (1), p.189-193
Main Authors: AKCAY, Mehmet, AKCAY, Gülten
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Bentonite - chemistry
Chlorophenols - isolation & purification
Exact sciences and technology
Hydrophobicity
Kinetics
Nitrophenols - isolation & purification
Organophilic clays
Phenolic compounds
Pollution
Removal
Solutions
Water - chemistry
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Summary:The adsorption of p-chlorophenol ( p-CP) and p-nitrophenol ( p-NP) on organophilic bentonite (dodecylammonium bentonite, DDAB) was studied as a function of solution concentration and temperature. The observed adsorption rates were found to be equal to the first-order kinetics. The rate constants were calculated for temperatures ranging between 25.0–35.0 °C at constant concentration. The adsorption energies, E and adsorption capacity, ( q m), for phenolic compounds adsorbed to organophilic bentonite were estimated by using the Dubinin-Radushkevic equation. Thermodynamic parameters from the adsorption isotherms of p-CP and p-NP on organophilic bentonite were determined. These isotherms were modeled according to Freundlich and Dubinin-Radushkevic adsorption isotherms and followed the V-shaped isotherm category with two steps. The amount of adsorption was found to be dependent on the relative energies of adsorbent–adsorbate, adsorbate–solvent and adsorbate–adsorbate interaction.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2004.06.026