| Abstract
| - The optical properties of photocatalytic suspensions, that is, the absorption and scattering coefficients, dependon the effective size of particle agglomerates. This work aimed to investigate if the pH and powder concentrationaffect the particle size and eventually the optical properties of suspensions. Aqueous suspensions of commercialTiO2 powders irradiated by monochromatic light have been optically characterized by measuring the transmittedphoton flow as a function of catalyst mass and by applying an asymptotic form of the Kubelka−Munk solutionof the radiative transfer equation. It was found that equal masses of catalyst at different pH and concentrationvalues show different particle size distributions and therefore different optical properties. Moreover, the quantumyield for the photocatalytic reaction of phenol was determined for each catalyst and pH.
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