Abstract
A new adsorption measurement method based on photoelectrochemical oxidation principles has been developed. The method can be used to directly quantify the amount of adsorbates at a TiO 2 electrode surface in a sensitive and accurate manner. The adsorption of phthalic acid was studied as a test case. The relationship between the amount of adsorbate at the TiO 2 surface and the concentration of phthalic acid in the solution was obtained. The adsorption of phthalic acid on TiO 2 surface was shown to follow a Langmuir type adsorption model. For the first time, the adsorption equilibrium constant of an adsorbate at TiO 2 surface has been photoelectrochemically measured. The adsorption equilibrium constant of phthalate on TiO 2 porous film at pH 4.0, K=4.0×10 4 M −1, was obtained using our method, which was close to that obtained by conventional methods. The effect of solution pH on the amount of adsorbate at TiO 2 surface was also investigated. The results indicate the adsorption of phthalic acid is mainly of chemical bonding nature.
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