ADSORPTION OF PHENOLS ONTO HYDROUS ZNS(S) - EFFECT OF COSOLVENT AND TEMPERATURE

The adsorption of phenols onto hydrous ZnS(s) surface in the presence of cosolvent, namely, methanol, was studied. Adsorption of phenols ont o hydrous ZnS(s) surface follows a linear relationship between adsorpt ion density and equilibrium concentration. In the presence of a cosolv ent, the extent of phenol adsorption decreases except catechol. Appare ntly, the adsorption of phenols is determined by hydrophobic partition whereas the adsorption of catchol is governed by specific chemical in teraction. Adsorption of phenols is an endothermic process; the extent of phenol adsorption increases with increasing temperature. This is a ttributed to the hydrophobic characteristics of the phenol adsorbents.