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<p>This study valorizes coal fly ash waste (FA) into an efficient bimetallic catalyst (CoMg@FA-6) for peroxymonosulfate (PMS) activation. Co/Mg-doped phyllosilicate was hydrothermally synthesized directly on FA and subsequently calcined at 600&#xa0;°C. Comprehensive characterizations confirmed the formation of a layered phyllosilicate structure with enhanced texture, hosting uniformly dispersed spinel Co<sub>3</sub>O<sub>4</sub> nanoparticles and periclase MgO crystallites. Crucially, Mg<sup>2+</sup> incorporation significantly accelerated Co<sup>3+</sup> reduction kinetics via electron transfer, enabling the CoMg@FA-6/PMS system to achieve double the tetracycline (TC) degradation efficiency compared to monometallic counterparts, while exhibiting a remarkable 71% reduction in cobalt leaching. Mechanistic investigations revealed a dual-pathway activation involving both radical (•OH/SO<sub>4</sub>•⁻) and non-radical (singlet oxygen, <sup>1</sup>O<sub>2</sub>) species, with <sup>1</sup>O<sub>2</sub> contributing 39.5% to TC removal. This work proposes a sustainable strategy for upcycling industrial solid waste into high-performance, low-leaching catalysts, advancing circular economy principles in environmental remediation.</p> Graphical abstract <p></p>

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Valorization of coal fly ash into a low-cobalt-leaching bimetallic catalyst for enhanced peroxymonosulfate activation in antibiotic remediation

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Jiajun Tao,
  • Jiao Yan,
  • Qing Sun,
  • Jiawei Sheng

摘要

This study valorizes coal fly ash waste (FA) into an efficient bimetallic catalyst (CoMg@FA-6) for peroxymonosulfate (PMS) activation. Co/Mg-doped phyllosilicate was hydrothermally synthesized directly on FA and subsequently calcined at 600 °C. Comprehensive characterizations confirmed the formation of a layered phyllosilicate structure with enhanced texture, hosting uniformly dispersed spinel Co3O4 nanoparticles and periclase MgO crystallites. Crucially, Mg2+ incorporation significantly accelerated Co3+ reduction kinetics via electron transfer, enabling the CoMg@FA-6/PMS system to achieve double the tetracycline (TC) degradation efficiency compared to monometallic counterparts, while exhibiting a remarkable 71% reduction in cobalt leaching. Mechanistic investigations revealed a dual-pathway activation involving both radical (•OH/SO4•⁻) and non-radical (singlet oxygen, 1O2) species, with 1O2 contributing 39.5% to TC removal. This work proposes a sustainable strategy for upcycling industrial solid waste into high-performance, low-leaching catalysts, advancing circular economy principles in environmental remediation.

Graphical abstract