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<p>In this work, CoFe-layered double metal oxide (CoFe-LDO) was obtained by a co-precipitation-calcination route using CoFe-layered double metal hydroxide (CoFe-LDH) as precursor material, and then MoS<sub>2</sub> and chitosan-derived N-doped carbon co- modified CoFe-LDO composite catalyst (MoS<sub>2</sub>@CoFe-LDO/NCS) was prepared. This material was characterized by SEM, EDS, FTIR, XRD and XPS, and was synthesized to catalyze ozonation for the degradation of methylene blue (MB). The influence of CoFe-LDO dosage, O<sub>3</sub> flow rate, initial MB concentration, catalyst dosage, initial pH and coexisting compounds on MB&#xa0;removal efficiency were systematically investigated. The decomposition efficiency of 50&#xa0;mg/L MB by 10%MoS<sub>2</sub>@CoFe-LDO/NCS reached 96.47% within 8&#xa0;min under the conditions of 10% CoFe-LDO dosage (CoFe -LDO:CS), pH = 6.8, catalyst dosage of 0.4 g/L, Ozone flow rate of 1.87 mg/(L⋅min) and 25&#xa0;°C. Stability tests and metal ion leaching experiments confirmed the excellent chemical stability and environmental compatibility of 10%MoS<sub>2</sub>@CoFe-LDO/NCS. Electrochemical characterization showed that 10%MoS<sub>2</sub>@CoFe-LDO/NCS possessed enhanced current density, redox activity and excellent electron transfer capability. Quenching experiments revealed that <sup>1</sup>O<sub>2</sub>, O<sub>2</sub><sup><b>∙</b>−</sup> and <b>∙</b>OH contributed to the MB degradation process, with O<sub>2</sub><sup><b>∙</b>−</sup> confirmed as the dominant reactive species.</p>

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Catalytic Ozone Decomposition of Methylene Blue by MoS2 and Chitosan-Derived N-Doped Carbon Co-Modified CoFe-LDO

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Yuanfang Yang,
  • Yunlan Xu,
  • Danli Tang,
  • Tanxia Xiang

摘要

In this work, CoFe-layered double metal oxide (CoFe-LDO) was obtained by a co-precipitation-calcination route using CoFe-layered double metal hydroxide (CoFe-LDH) as precursor material, and then MoS2 and chitosan-derived N-doped carbon co- modified CoFe-LDO composite catalyst (MoS2@CoFe-LDO/NCS) was prepared. This material was characterized by SEM, EDS, FTIR, XRD and XPS, and was synthesized to catalyze ozonation for the degradation of methylene blue (MB). The influence of CoFe-LDO dosage, O3 flow rate, initial MB concentration, catalyst dosage, initial pH and coexisting compounds on MB removal efficiency were systematically investigated. The decomposition efficiency of 50 mg/L MB by 10%MoS2@CoFe-LDO/NCS reached 96.47% within 8 min under the conditions of 10% CoFe-LDO dosage (CoFe -LDO:CS), pH = 6.8, catalyst dosage of 0.4 g/L, Ozone flow rate of 1.87 mg/(L⋅min) and 25 °C. Stability tests and metal ion leaching experiments confirmed the excellent chemical stability and environmental compatibility of 10%MoS2@CoFe-LDO/NCS. Electrochemical characterization showed that 10%MoS2@CoFe-LDO/NCS possessed enhanced current density, redox activity and excellent electron transfer capability. Quenching experiments revealed that 1O2, O2∙− and ∙OH contributed to the MB degradation process, with O2∙− confirmed as the dominant reactive species.