Abstract
Under UV-A light, chromium(VI) is reduced to chromium(III) on the surfaces of ZrO2 and ZnS. The reductions in neutral solution on ZrO2 and ZnS are comparable to those on CdS and ZnO, respectively. The photokinetic behavior of the reduction on ZrO2 and ZnS is similar to that on CdS and ZnO; it follows first-order kinetics on chromium(VI), depends on catalyst loading and photon flux, and is independent of dissolved oxygen. The reduction is larger with UV-C light than with UV-A light. Chromate-sensitized activation of ZrO2 is the probable mechanism of the photoreduction on the ZrO2 surface under UV-A light.
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