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By illumination (A >300 nm) of a suspension of n-Ti02 (grain size 5^0.06 mm, 3 to 15 mg/ml) in aqueous acid solutions, containing 10 -3 mol • dm -3 Ce 4+ -ions an enhanced evolution of oxygen is observed. Its yield is dependent on the amount of TiC>2 in the suspension and on the temperature. Using n-TiC>2 suspended in diluted sulfuric acid, hydrogen and oxygen were produced in a ratio of about 2: 1. In both systems n-TiC>2 is acting as an efficient electron donor. For the explanation of the processes probable reaction mechanisms are proposed.

Bei der Bestrahlung (Ä 300 nm) einer wäßrig sauren Suspension von n‐TiOz (Korngröße 0.06 mm, 3‐15 mg/ml), die l0′3 mol‐dm′3 Ce4+‐Ionen enthält, wird verstärkte O2‐Entwicklung beobachtet.

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