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Mechanism of Sorption of Phenols from Aqueous Solutions onto Surfactant-Modified Montmorillonite

✍ Scribed by Ruey-Shin Juang; Su-Hsia Lin; Kung-Hsuen Tsao

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
162 KB
Volume
254
Category
Article
ISSN
0021-9797

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✦ Synopsis

Equilibrium and kinetic studies on the sorption of phenol, m-nitrophenol (m-NP), and o-cresol from water onto montmorillonite modified with cetyltrimethylammounium bromide (CTAB) were conducted. Experiments were carried out as a function of solution pH, sorbate concentration, and temperature (25-55 degrees C). It was shown that the sorption capacity decreased in the order phenol>o-cresol>m-NP. The Langmuir, dual-mode sorption, and Redlich-Peterson models were tested to fit the sorption isotherms of single-solute systems, whereas the Langmuir competitive model was used to describe bisolute sorption equilibria. Thermodynamic parameters (DeltaH degrees and DeltaS degrees ) and the mean free energy (E) for the sorption of phenols were determined from the temperature dependence of the distribution constant and the Dubinin-Radushkevick equation, respectively. A simplified kinetic model was proposed to confirm the sorption mechanism.

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