Abstract
Monophenyl terephthalate (MPT −), an anionic carboxylic acid ester, is subject to base-catalyzed hydrolysis in the neutral to alkaline pH range. The present study shows that MPT − hydrolysis rates in buffered 10 g/liter aluminum oxide suspensions are more than an order of magnitude higher than rates in homogeneous solution. Hydrolysis rates in silica suspensions are the same as in homogeneous solution. Aluminum oxide surface-enhanced hydrolysis rates attain a maximum at pH 5.8 and are diminished by increases in ionic strength. The extent of MPT − adsorption and rates of surface-enhanced hydrolysis as a function of pH and ionic strength are consistent with a mechanism involving attack of specifically adsorbed MPT − by hydroxide ions in the diffuse layer. Other specifically adsorbable organic pollutants should experience a similar surface enhancement of base hydrolysis on aluminum oxide surfaces.
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