Abstract
The adsorption of phenol and three commonly used frothers, namely, terpineol, methylisobutylcarbinol (MIBC) and cresol, on coal surfaces has been studied through UV spectrophotometric and gas chromatographic techniques. The rate of attaining adsorption equilibrium of these alcohols onto coal is very slow, possibly due to pore diffusion. The adsorption isotherms are of typical Langmuir-type except for MIBC, where the adsorption density rises linearly with equilibrium concentration in solution in the range of concentration under study. Free energies of adsorption were calculated from the adsorption isotherms. The results indicate that adsorption occurs through hydrophobic interactions between the frother molecules and the coal surface. The effect of oxidation and pH on adsorption behavior was also studied. Oxidized coal is more hydrophilic and hence the adsorption of these nonionic surface-active agents is reduced after oxidation.
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