A study of mixed RuO₂/TiO₂ catalysts for the photochemical oxidation of water by persulfate ions, sensitised by ruthenium(II)tris(2,2′‐bipyridine)ions

Abstract

Abstract. Mixed Ru02/Ti02 catalysts with a varying Ru02/Ti02 ratio have been examined in the oxidation of water by persulfate ions under illumination with visible light, sensitised by Ru(bipy) 32+. An optimum in the rate of oxygen evolution is found when the Ru02/Ti02 ratio amounts to about 10/90. A catalyst, which was prepared by precipitation of relatively small amounts of Ru02 on Ti02, displays a considerably higher activity in the photochemical oxidation of water than the mixed Ru02/Ti02 catalysts.