Abstract
The reactivity of phenol under oxic and anoxic conditions in irradiated (350 nm) aqueous suspensions of TiO 2 as a function of pH was studied. The initial rate of disappearance of phenol is significantly influenced by solution pH. The initial disappearance rates and Langmuir-Hinshelwood kinetic parameters are comparable over a range from pH 3 to 9 and at pH 13.7, while substantial changes are observed at pH 1 and 11. These differences are attributed to speciation of the reactants and changes in the surface of the TiO 2 as a function of solution pH. The involvement of oxide radical anion .O − is proposed at pH ⩾ 12. Under highly acidic or basic conditions, colored oligomers are formed as a results, at least in part, of direct photolysis. In the presence of TiO 2 the colored oligomers are readily degraded, while in the absence of TiO 2 the color continues to develop upon extended irradiation.
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