The Pt/TiO2 particles have been prepared by the photodeposition of Pt on TiO2 surface and characterized by X-ray diffraction. Photocatalytic H-2 production from acetic acid (HAc) over Pt/TiO2 in aqueous solution has been studied at ambient temperature under UV irradiation. The effects of operational variables such as Pt loading, photocatalyst concentration, HAc concentration, and solution pH, have been systematically investigated. The optimum conditions for H-2 production from HAc by Pt/TiO2 were Pt loading 1.0 wt.%, Pt/TiO2 concentration 0.22 g/L, HAc concentration 6.52 g/L and pH 1.0. The H-2 yield is 0.27 mol-H-2/mol-HAc obtained under prolonged time irradiation. Experimental results showed that the photocatalytic H-2 production activity could be enhanced remarkably by depositing a suitable amount Pt on TiO2 surface. Based on our results, a new process for H-2 production from biomass can be achieved by coupling fermentative H-2 production with photocatalytic H-2 production. The process also provides a method for degradation of organic pollutants with simultaneous H-2 production. A possible mechanism for photocatalytic decomposition of HAc over Pt/TiO2 was also proposed. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.