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Simultaneous Oxidation of Citric Acid and Reduction of Copper Ion by TiO2 Photocatalysis

The present study is targeted on the simulated wastewater containing Cu(Ⅱ), citric acid and TiO2 under UV illumination in the presence of oxygen and at acidic pH. The photocatalytic reaction obeys first-order kinetic equation. The inﬂuence of Cu(Ⅱ) on photocatalytic oxidation of citric acid and how citric acid will affect the treatment of Cu(II) were described. The result showed that the coexistence of Cu(Ⅱ) and citric acid was favourable to the photocatalytic oxidation and reduction. Cu(Ⅱ) reductive product was analyzed by using X-ray Photoelectron Spectroscopy.