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Oxidation and reduction rates are increased when the photocatalyst TiO2 is doped with metal ions. The photochemical oxidation of CHCl3 and the photochemical reduction of CCl4 were examined in the presence of 21 different doped TiO2 catalysts. Dopant metal ions with closed shells were found to have little effect on reactivity. The authors present their results in the form of a periodic chart.