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<p>Bauxite residue is both a solid waste and a valuable secondary resource due to its rich content of recoverable components. The extraction of CaTiO<sub>3</sub> from calcined bauxite residues and its application as a photocatalyst represent an innovative approach for the valorization of bauxite residue. In this study, the photocatalytic performance and mechanism of CaTiO<sub>3</sub> derived from bauxite residues at different roasting temperatures and durations were systematically investigated. The results demonstrated that both increasing roasting temperature and prolonging roasting time significantly enhanced the photocatalytic activity of CaTiO<sub>3</sub>. Optimal performance was achieved at 1100°C for 120 min, under which CaTiO<sub>3</sub> exhibited a Rhodamine B (RhB) degradation efficiency of 93% within 6 h. In contrast, CaTiO<sub>3</sub> obtained at 800°C only achieved 85% RhB degradation even after 12 h of UV irradiation. The RhB degradation process followed first-order reaction kinetics, with the apparent rate constant for CaTiO<sub>3</sub> calcined at 1100°C being nearly twice that of the sample obtained at 800°C. Further analysis revealed that CaTiO<sub>3</sub> obtained at higher temperatures possessed a narrower bandgap and improved separation efficiency of photogenerated electron-hole pairs, both of which contributed to its superior photocatalytic performance. It was confirmed that holes (h<sup>+</sup>) served as the primary active species responsible for RhB degradation.</p>

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Differences in Photocatalytic Performance and the Underlying Mechanisms of CaTiO3 Derived from Bauxite Residues Calcined at Different Temperatures

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Bona Deng,
  • Jing Zhang,
  • Yu Gong,
  • Zijian Li,
  • Yaoyang Ruan,
  • Huihua Luo,
  • Fang Zhou

摘要

Bauxite residue is both a solid waste and a valuable secondary resource due to its rich content of recoverable components. The extraction of CaTiO3 from calcined bauxite residues and its application as a photocatalyst represent an innovative approach for the valorization of bauxite residue. In this study, the photocatalytic performance and mechanism of CaTiO3 derived from bauxite residues at different roasting temperatures and durations were systematically investigated. The results demonstrated that both increasing roasting temperature and prolonging roasting time significantly enhanced the photocatalytic activity of CaTiO3. Optimal performance was achieved at 1100°C for 120 min, under which CaTiO3 exhibited a Rhodamine B (RhB) degradation efficiency of 93% within 6 h. In contrast, CaTiO3 obtained at 800°C only achieved 85% RhB degradation even after 12 h of UV irradiation. The RhB degradation process followed first-order reaction kinetics, with the apparent rate constant for CaTiO3 calcined at 1100°C being nearly twice that of the sample obtained at 800°C. Further analysis revealed that CaTiO3 obtained at higher temperatures possessed a narrower bandgap and improved separation efficiency of photogenerated electron-hole pairs, both of which contributed to its superior photocatalytic performance. It was confirmed that holes (h+) served as the primary active species responsible for RhB degradation.