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<p>A comparative investigation of Co/Fe-LDH microstructures on the performance of PMS activation was conducted relying on typical ones of nanotube (LDH-1), nanosheet (LDH-2), and nanosphere (LDH-3). LDH-3 displayed the most excellent performance for sulfamethoxazole (SMX) degradation with a second-order reaction kinetic constant (<i>k</i>) reaching 0.040 L/mg/min, followed by LDH-2 (0.029 L/mg/min) and LDH-1 (0.024 L/mg/min) in turn. The quenching experiment of active species showed that although the microscopic morphology did not change the joint action of hydroxyl radical (OH), sulfate radical (SO<sub>4</sub><sup>-</sup>) and singlet oxygen (<sup>1</sup>O<sub>2</sub>), it changed the reaction contribution (<i>RC</i>) of OH and SO<sub>4</sub><sup>-</sup>. The activation performance and mechanism difference among LDH-1, LDH-2, and LDH-3 was attributed to the combined action of specific surface area, active site exposure, mass transfer, electron transfer, and microstructural confinement and surface-exposure effect. This work deepened the understanding of structure-induced mechanism in LDH/PMS system, providing theoretical support and practical basis for the precise design in further.</p>

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Microstructure-Dependent Activation of Peroxymonosulfate by Co/Fe Layered Double Metal Hydroxide: Comparative Study and Mechanistic Insights

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Mingyao Yuan,
  • Jia Ma,
  • Zhenxing Zeng,
  • Yanzong Zhang,
  • Guochun Lv,
  • Shihuai Deng,
  • Xiaojing Wang

摘要

A comparative investigation of Co/Fe-LDH microstructures on the performance of PMS activation was conducted relying on typical ones of nanotube (LDH-1), nanosheet (LDH-2), and nanosphere (LDH-3). LDH-3 displayed the most excellent performance for sulfamethoxazole (SMX) degradation with a second-order reaction kinetic constant (k) reaching 0.040 L/mg/min, followed by LDH-2 (0.029 L/mg/min) and LDH-1 (0.024 L/mg/min) in turn. The quenching experiment of active species showed that although the microscopic morphology did not change the joint action of hydroxyl radical (OH), sulfate radical (SO4-) and singlet oxygen (1O2), it changed the reaction contribution (RC) of OH and SO4-. The activation performance and mechanism difference among LDH-1, LDH-2, and LDH-3 was attributed to the combined action of specific surface area, active site exposure, mass transfer, electron transfer, and microstructural confinement and surface-exposure effect. This work deepened the understanding of structure-induced mechanism in LDH/PMS system, providing theoretical support and practical basis for the precise design in further.