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<p>Semiconductor photocatalytic materials have demonstrated considerable potential in environmental pollution applications as an advanced oxidation process (AOP). BaWO<sub>4</sub> synthesized by co-precipitation is a single phase crystallizing in the Scheelite-type structure with quadratic symmetry, as confirmed by X-ray diffraction; its band gap (2.95 eV) is attributed to the charge transfer: O<sup>2−</sup>: <i>2p</i> → W<sup>6+</sup>: <i>e</i><sub><i>g</i></sub>: level. A flat band potential of 0.20 V<sub>SCE</sub> with <Emphasis Type="BoldItalic">n</Emphasis>-type conduction was determined from the capacitance measurement. The excited electrons acquire a high reducing power in the conduction band (–&#xa0;0.11 V<sub>SCE</sub>), thus reducing oxygen into short lived superoxide O<sub>2</sub><sup>∙−</sup>, allowing the ibuprofen mineralization. As application, BaWO<sub>4</sub> was successfully tested to oxidize ibuprofen under UV and solar irradiation light. Several operational parameters were systematically evaluated, such as light activation, BaWO<sub>4</sub> mass, pollutant concentration, pH, and catalyst support. The photocatalysis activity under LED irradiation with BaWO<sub>4</sub> in suspension exhibits the best performance at lower ibuprofen concentration, with degradation and mineralization rates reaching 76% and 66%, respectively. Moreover, BaWO<sub>4</sub> demonstrated improved photoactivity under solar light.</p>

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Investigation of physico-chemical parameters for the photocatalysis of ibuprofen degradation by Scheelite BaWO4 semiconductor

  • 期刊论文

  • 发表日期：

    2025年1月29日

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  • Ismail Daoud,
  • Abdelaziz Sahmi,
  • Ali Mameri,
  • Djamel Miroud,
  • Mohammed Amine Benziada,
  • Mohamed Trari

摘要

Semiconductor photocatalytic materials have demonstrated considerable potential in environmental pollution applications as an advanced oxidation process (AOP). BaWO4 synthesized by co-precipitation is a single phase crystallizing in the Scheelite-type structure with quadratic symmetry, as confirmed by X-ray diffraction; its band gap (2.95 eV) is attributed to the charge transfer: O2−: 2p → W6+: eg: level. A flat band potential of 0.20 VSCE with n-type conduction was determined from the capacitance measurement. The excited electrons acquire a high reducing power in the conduction band (– 0.11 VSCE), thus reducing oxygen into short lived superoxide O2∙−, allowing the ibuprofen mineralization. As application, BaWO4 was successfully tested to oxidize ibuprofen under UV and solar irradiation light. Several operational parameters were systematically evaluated, such as light activation, BaWO4 mass, pollutant concentration, pH, and catalyst support. The photocatalysis activity under LED irradiation with BaWO4 in suspension exhibits the best performance at lower ibuprofen concentration, with degradation and mineralization rates reaching 76% and 66%, respectively. Moreover, BaWO4 demonstrated improved photoactivity under solar light.