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The Past. In a 1972 review article, Steinbach 1 discussed, among other things, the direct observation of the interaction between photons and valence electrons of a semiconductor by means of photoelectron emission, photoannealing processes, photosorption and the occupation of electron levels in the solid, photosorption and related processes in ZnO, photosorption on TiO2, photocatalytic reactions, photoenhancement by changes of rate constants, the influence of illumination on the activation energy, correlation between the activation energy of the catalytic reaction and conditions, the influence of wavelength and light irradiance, the decomposition of isopropanol on ZnO, and photocatalytic oxidations occurring on metals. An even earlier description of the photocatalytic properties of some metal oxides was given in 1955 by Markham 2 who dealt with ZnO, Sb2O3, and TiO2 and the various types of photochemical …