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<p>The removal of organic dyes from wastewater using manganese dioxide (MnO<sub>2</sub>) and its composites has garnered significant attention, but recycling them remains challenging. In this study, MnO<sub>2</sub> was combined with polypropylene melt-blown nonwoven material (PP MB) in a simple way to prepare a composite material, which makes MnO<sub>2</sub> easy to be recycled and reused. MnO<sub>2</sub> with sea urchin-like structure were synthesized using a hydrothermal method and subsequently anchored onto the surface of PP MB modified by polydopamine (PDA) in various loading concentration, resulting in the preparation of MnO<sub>2</sub>@PP MB for removing organic dyes from wastewater. The size of the synthesized MnO<sub>2</sub> is about 6&#xa0;μm and its specific surface area is 21.73&#xa0;m<sup>2</sup>/g. When the loading concentration of MnO<sub>2</sub> is 1&#xa0;mg/mL, the pH of adsorption solution is 3, and the&#xa0;adsorption solution temperature is 25&#xa0;°C, the removal efficiencies of MnO<sub>2</sub>-1@PP MB for rhodamine B (RhB), methyl blue (MB), methyl orange (MO), and Carmine (CRM) in water all are achieved 99.00% in an impressive rate. Remarkably, even after undergoing twenty adsorption-desorption cycles, the removal efficiency for of MnO<sub>2</sub>-1@PP MB for RhB remained consistently around 99.00%. Furthermore, it was found that the removal behavior of MnO<sub>2</sub>@PP MB for RhB follows the&#xa0;pseudo-second-order kinetic model, meaning that is the adsorption process is primarily driven by chemical interactions. Compared to pristine PP MB, the mechanical properties of MnO<sub>2</sub>-1@PP MB just slightly decrease.</p>

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Preparation of MnO2@PP MB for Organic Dyes Removal

  • 期刊论文

  • 发表日期：

    2025年2月26日

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  • Dewei Zhang,
  • Hui Sun,
  • Bin Yu,
  • Youxiu Xie,
  • Fengchun Li

摘要

The removal of organic dyes from wastewater using manganese dioxide (MnO2) and its composites has garnered significant attention, but recycling them remains challenging. In this study, MnO2 was combined with polypropylene melt-blown nonwoven material (PP MB) in a simple way to prepare a composite material, which makes MnO2 easy to be recycled and reused. MnO2 with sea urchin-like structure were synthesized using a hydrothermal method and subsequently anchored onto the surface of PP MB modified by polydopamine (PDA) in various loading concentration, resulting in the preparation of MnO2@PP MB for removing organic dyes from wastewater. The size of the synthesized MnO2 is about 6 μm and its specific surface area is 21.73 m2/g. When the loading concentration of MnO2 is 1 mg/mL, the pH of adsorption solution is 3, and the adsorption solution temperature is 25 °C, the removal efficiencies of MnO2-1@PP MB for rhodamine B (RhB), methyl blue (MB), methyl orange (MO), and Carmine (CRM) in water all are achieved 99.00% in an impressive rate. Remarkably, even after undergoing twenty adsorption-desorption cycles, the removal efficiency for of MnO2-1@PP MB for RhB remained consistently around 99.00%. Furthermore, it was found that the removal behavior of MnO2@PP MB for RhB follows the pseudo-second-order kinetic model, meaning that is the adsorption process is primarily driven by chemical interactions. Compared to pristine PP MB, the mechanical properties of MnO2-1@PP MB just slightly decrease.