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<p>Advanced oxidation process for water purification is a promising environmental remediation method, but its application is hindered by the difficulty of rapid recovery and reuse of catalysts. Herein, potassium permanganate (KMnO<sub>4</sub>) was used as the primary material to synthesize MnO<sub>2</sub> nanosheets on the surface of 3D nickel foam (MnO<sub>2</sub>@NF) through a simple hydrothermal method. A comprehensive analysis of the growth mechanism of MnO<sub>2</sub> nanosheets on NF was conducted and the catalytic properties of MnO<sub>2</sub>@NF were systematically explored. After activating peroxymonosulfate (PMS) with MnO<sub>2</sub>@NF, the degradation of rhodamine B (RhB) was promoted, and the degradation performance was impressive, with a removal efficiency of over 92% within 60&#xa0;min. The studies revealed that MnO<sub>2</sub>@NF exhibits high catalytic cycling stability, excellent morphological and valence state stability in the treatment of RhB wastewater. Besides, based on UV-Vis absorption spectrum, quenching experiments and electron paramagnetic resonance tests, the oxidative degradation of RhB is achieved by activating PMS with MnO<sub>2</sub> to generate non-free radicals (<sup>1</sup>O<sub>2</sub>) and free radicals (•OH, and SO<sub>4</sub><sup>•−</sup>). These results demonstrate that MnO<sub>2</sub>@NF is an effective catalyst for application in real wastewater treatment.</p> Graphical Abstract <p></p>

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Facile Synthesis of MnO2 Catalysts on 3D Nickel Foam for Efficient Degradation of Rhodamine B by Activating Peroxymonosulfate

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Zhimin Li,
  • Tong Guan,
  • Hangyu Shi,
  • Chuan Wang,
  • Xue Peng,
  • Shumin Wang

摘要

Advanced oxidation process for water purification is a promising environmental remediation method, but its application is hindered by the difficulty of rapid recovery and reuse of catalysts. Herein, potassium permanganate (KMnO4) was used as the primary material to synthesize MnO2 nanosheets on the surface of 3D nickel foam (MnO2@NF) through a simple hydrothermal method. A comprehensive analysis of the growth mechanism of MnO2 nanosheets on NF was conducted and the catalytic properties of MnO2@NF were systematically explored. After activating peroxymonosulfate (PMS) with MnO2@NF, the degradation of rhodamine B (RhB) was promoted, and the degradation performance was impressive, with a removal efficiency of over 92% within 60 min. The studies revealed that MnO2@NF exhibits high catalytic cycling stability, excellent morphological and valence state stability in the treatment of RhB wastewater. Besides, based on UV-Vis absorption spectrum, quenching experiments and electron paramagnetic resonance tests, the oxidative degradation of RhB is achieved by activating PMS with MnO2 to generate non-free radicals (1O2) and free radicals (•OH, and SO4•−). These results demonstrate that MnO2@NF is an effective catalyst for application in real wastewater treatment.

Graphical Abstract