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<p>Peroxymonosulfate-based advanced oxidation processes (PMS-AOPs) provide a new avenue in driving organic pollutants removal required no additional energy, but the green highly efficient catalyst still remains a technical bottleneck. In this study, a novel floatable bismuth-rich Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub> catalyst supported on fly ash cenospheres (FACs) was successfully synthesized via one-step facile neutralization hydrolysis method with controlled pH. The resulting material features nanosheet-like Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub> with a thickness of 30–50&#xa0;nm anchored onto FACs, enriched with oxygen vacancies (OVs) and an increased specific surface area. The Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub>@FACs composite exhibited excellent PMS activation capability, achieving 94.9% removal of Rhodamine B (RhB) within 30&#xa0;min under dark conditions and significantly outperforming systems with PMS alone, FACs/PMS, or BiOBr@FACs/PMS. Furthermore, the catalyst maintained high performance across various water matrices and demonstrated good reusability, indicating its potential for practical applications. Quenching experiments and electron paramagnetic resonance (EPR) analysis revealed that singlet oxygen (<sup>1</sup>O<sub>2</sub>) serves as the dominant reactive species in the Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub>@FACs/PMS system. Through multiple characterization techniques and mechanistic studies, it was confirmed that the enhanced RhB removal is attributed to the increased specific surface area, decreased charge transfer resistance and participation of OVs. This work not only expands the utilization of industrial solid waste (FACs) but also presents a feasible approach for designing efficient, recyclable and floatable catalysts for sustainable water remediation via PMS activation.</p>

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Facile synthesis of floatable Bi4O5Br2@FACs enriched in oxygen vacancies for high-efficiency RhB removal by direct peroxymonosulfate activation

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • Li Lin,
  • Yinggu Wu,
  • Yutong Liu,
  • Ling Xu,
  • Yi Huang,
  • Tianpeng Li

摘要

Peroxymonosulfate-based advanced oxidation processes (PMS-AOPs) provide a new avenue in driving organic pollutants removal required no additional energy, but the green highly efficient catalyst still remains a technical bottleneck. In this study, a novel floatable bismuth-rich Bi4O5Br2 catalyst supported on fly ash cenospheres (FACs) was successfully synthesized via one-step facile neutralization hydrolysis method with controlled pH. The resulting material features nanosheet-like Bi4O5Br2 with a thickness of 30–50 nm anchored onto FACs, enriched with oxygen vacancies (OVs) and an increased specific surface area. The Bi4O5Br2@FACs composite exhibited excellent PMS activation capability, achieving 94.9% removal of Rhodamine B (RhB) within 30 min under dark conditions and significantly outperforming systems with PMS alone, FACs/PMS, or BiOBr@FACs/PMS. Furthermore, the catalyst maintained high performance across various water matrices and demonstrated good reusability, indicating its potential for practical applications. Quenching experiments and electron paramagnetic resonance (EPR) analysis revealed that singlet oxygen (1O2) serves as the dominant reactive species in the Bi4O5Br2@FACs/PMS system. Through multiple characterization techniques and mechanistic studies, it was confirmed that the enhanced RhB removal is attributed to the increased specific surface area, decreased charge transfer resistance and participation of OVs. This work not only expands the utilization of industrial solid waste (FACs) but also presents a feasible approach for designing efficient, recyclable and floatable catalysts for sustainable water remediation via PMS activation.