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The delafossite CuCrO2 elaborated by sol-gel from 40 nm diameter colloid is optically active in the visible region. It is characterized physically and photoelectrochemically. The microstructure is fairly homogenous with a mean crystallite size of ca. 2 μm. The optical gap (1.30 eV), determined from the diffuse reflectance, is well suited to the sunlight spectrum. The Mott Schottky plot is characteristic of P-type conductivity with a flat band potential of -0.26 VSCE. As application, the photoreduction of chromate is successfully achieved in air-equilibrated suspension CuCrO2/ZnO (1/1). CuCrO2 is photoactivated by visible light and the electrons in the conduction band (-1.34 VSCE) are injected to ZnO. In the presence of salicylic acid, a conversion of Cr(VI) to Cr(III) of 57% is obtained under optimal conditions (pH 3 at 25℃, 5×10-4 mol/L) because of the HCrO4- dark adsorption onto ZnO (4HCrO4- + 3C7H6O3 + 18O2 + 16H+ → 4Cr3+ + 21CO2 + 19H2O, ΔG0 = -557 kcal/mol). Prolonged illumination is accompanied by a deceleration in the photoactivity owing to the competitive water reduction, an issue of energetic concern. The hetero-system exhibits self sensitization for hydrogen production with an evolution rate of 149 μmol/(hr·g). 相似文献
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Cherif Sonia Djelal Hayet Firmin Stephane Bonnet Pierre Frezet Lawrence Kane Abdoulaye Amine Assadi Aymen Trari Mohamed Yazid Hynda 《Environmental science and pollution research international》2022,29(44):66640-66658
Environmental Science and Pollution Research - This study deals with the toxicity of the treated solutions of two types of dyes, namely, the anthraquinonic Reactive Bleu 19 dye (RB19) and the... 相似文献
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Brahimi Billal Mekatel Elhadj Kenfoud Hamza Berrabah Salah Eddine Trari Mohamed 《Environmental science and pollution research international》2022,29(50):75512-75524
Environmental Science and Pollution Research - The heterogeneous photocatalysis is known to provide significant degradation and mineralization of emerging contaminants including antibiotics. For... 相似文献
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