Abstract
The photo-reduction of hexavalent chromium was carried out varying different parameters such as pH, titania loading on zirconium phosphate (ZrP) and titanium phosphate (TiP), initial substrate concentration, irradiation time and catalyst dose. The reduction rate of chromium was favorable under acidic pH than in the alkaline pH. The dissolved oxygen imparts the minimum effect on the reduction of Cr(VI) as oxygen competes with the hexavalent chromium for the electron in the acidic solutions. Hexavalent chromium was completely reduced over titania pillared ZrP and TiP under solar radiation. This process of photo-reduction follows approximately pseudo first-order kinetics.
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