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Cr(VI) photocatalytic reduction under sunlight followed by Cr(III) extraction from TiO2 surface

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Materials Letters

Volume 176, Issue 10, 2016, Pages 106-109

Cr(VI) photocatalytic reduction under sunlight followed by Cr(III) extraction from TiO2 surface

Ridha Djellabi, Fouzi M.Ghorab, Sana Nouacer, Abdelaziz Smara, Ouahida Khireddine

Abstract: The main objective of this work was the extraction of Cr(III) from TiO2 surface deposited after Cr(VI) reduction by TiO2 solar photocatalysis. The results show that the reduction of Cr(VI) to Cr(III) by TiO2 under natural sunlight is total after 2 h using tartaric acid (A.T) as a hole scavenger under the following conditions: [Cr(VI)]: 20 ppm, [TiO2]: 2 g/L, [A.T]: 60 ppm and pH: 2.2.

The produced Cr(III) is divided between deposited onto TiO2 surface (39.75%) and in the solution (60.25%). The Cr(III) removal from TiO2 surface by the sequential extraction after three washing were 90.13% and 42.62% using citric acid and EDTA respectively.

Keywords : Chromium, Reduction, Deposition, Solar light, extraction, TiO2 surface

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