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<p>The pervasive environmental presence of endocrine-disrupting bisphenol A (BPA) necessitates advanced remediation technologies. This study presents the rational design and synthesis of a novel bimetallic MIL-88B(Fe/Co)@TiO<sub>2</sub> heterostructure as a highly efficient visible-light-driven photocatalyst for BPA degradation. Comprehensive characterization via XRD, SEM-EDX, FTIR, and BET confirmed the successful integration of TiO<sub>2</sub> nanoparticles with the bimetallic MOF, forming a composite with a narrowed bandgap (2.13&#xa0;eV) and enhanced visible-light absorption. Response Surface Methodology (RSM) based on a Central Composite Design (CCD) optimized key operational parameters, predicting and achieving a remarkable 95.3% degradation under optimal conditions (pH 4.4, catalyst dose 43&#xa0;mg, [BPA] 78&#xa0;mg L<sup>− 1</sup>, [H<sub>2</sub>O<sub>2</sub>] 3.20%). Kinetic studies revealed rapid degradation following a pseudo-first-order model with a rate constant of 0.050&#xa0;min<sup>− 1</sup> and a half-life of 13.86&#xa0;min. Scavenger experiments elucidated a synergistic mechanism where hydroxyl radicals (·OH), generated via a combined photocatalytic and Fenton-like pathway, played the dominant role. The catalyst demonstrated satisfactory stability over four consecutive cycles. The composite’s engineered synergy resulted in a high degradation efficiency, rapid kinetics, and compelling reusability, demonstrating its high potential for practical wastewater treatment applications.</p>

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Engineering a visible-light-driven heterostructure: synergistic catalysis of bimetallic MIL-88B(Fe/Co)@TiO2 for efficient BPA mineralization

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月24日

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  • Zinat Gordi,
  • Hamid Rashidiyanfar,
  • Leila Hokmabady

摘要

The pervasive environmental presence of endocrine-disrupting bisphenol A (BPA) necessitates advanced remediation technologies. This study presents the rational design and synthesis of a novel bimetallic MIL-88B(Fe/Co)@TiO2 heterostructure as a highly efficient visible-light-driven photocatalyst for BPA degradation. Comprehensive characterization via XRD, SEM-EDX, FTIR, and BET confirmed the successful integration of TiO2 nanoparticles with the bimetallic MOF, forming a composite with a narrowed bandgap (2.13 eV) and enhanced visible-light absorption. Response Surface Methodology (RSM) based on a Central Composite Design (CCD) optimized key operational parameters, predicting and achieving a remarkable 95.3% degradation under optimal conditions (pH 4.4, catalyst dose 43 mg, [BPA] 78 mg L− 1, [H2O2] 3.20%). Kinetic studies revealed rapid degradation following a pseudo-first-order model with a rate constant of 0.050 min− 1 and a half-life of 13.86 min. Scavenger experiments elucidated a synergistic mechanism where hydroxyl radicals (·OH), generated via a combined photocatalytic and Fenton-like pathway, played the dominant role. The catalyst demonstrated satisfactory stability over four consecutive cycles. The composite’s engineered synergy resulted in a high degradation efficiency, rapid kinetics, and compelling reusability, demonstrating its high potential for practical wastewater treatment applications.