Photocatalytic reductions of MnO4−, Cr2O72−, and Fe3+ on illuminated rutile were demonstrated. The suitability of a method to analyze the reduction process of the photocatalytic reaction was discussed. It was concluded that a high utilization of light energy could not be expected for photocatalytic reactions because both bands of the semiconductor participated in the reaction. In such a case, the development of the photocatalvtic process into a photoelectrochemical cell has a great advantage from the point of view of energy utilization.
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Miyake et al. (1977) studied this question.
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