The adsorption of carbon monoxide on the TiO2 (anatase) surface at room temperature was studied by infrared spectroscopy and volumetry. The experimental data obtained indicate weak adsorption of CO molecules on the exponentially heterogeneous surface. The adsorption heat decreases according to the logarithmic law in the coverage range of 0.002-0.03. The extinction coefficient of adsorbed CO for the heterogeneous CO/TiO2 system is calculated using the Bouguer-Lambert-Beer law with correction for the Lorenz field taken into account. The conditions for the applicability of the Bouguer-Lambert-Beer's law for the study of heterogeneous systems are discussed.

In this study the process of the CO desorption from the titania surface under ultraviolet irradiation at room temperature was studied by IR spectroscopy and volumetry methods. The obtained experimental data showed the UV-exposure induces the decrease in the amount of adsorbed CO molecules on the surface. Moreover, the desorption reaction rates were determined for the observedprocess and its dependencies on the initial adsorbate pressure and on the light irradiance were acquired. In addition, the plausible mechanism was suggested to describe the process in details.