Photocatalytic Reduction and Immobilization of Hexavalent Chromium at Titanium Dioxide in Aqueous Basic Media

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Abstract
The thermodynamic aspects of the photocatalytic reduction of Cr(VI) at are first discussed and contrasted for pH 0 and pH 10 aqueous media. The photocorrosion of is shown to be thermodynamically less favorable in basic media. A scheme for the one‐step removal of Cr(VI) at via its reduction and subsequent immobilization [as ] is demonstrated for pH 10 chromate solutions. Dissolved oxygen is shown to inhibit the reduction of Cr(VI). A preliminary kinetics analysis reveals adherence of the initial rate of Cr(VI) reduction to the simple Langmuir model.