Abstract
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°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 (Δ H° and Δ S°) 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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