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<p>Effective plastic waste management is critical for mitigating environmental pollution and advancing sustainability. This study introduces a novel, eco-friendly approach for separating polyvinyl chloride (PVC) from mixed plastic waste using a CaO catalyst derived from natural sources, such as clamshells and eggshells. The method employs ultrasonication-assisted surface treatment with CaO to enhance PVC wettability by hydrating its surface, thereby increasing hydrophilicity. This enables efficient separation via froth flotation, where treated PVC sinks while hydrophobic plastics, like polycarbonate (PC), remain afloat. Experimental results demonstrate a separation efficiency of over 95% for PVC, with the CaO catalyst reducing waste and ensuring an environmentally sustainable process. The technique’s simplicity, cost-effectiveness, and reliance on natural materials highlight its potential for large-scale industrial applications in plastic waste recycling, offering a promising solution for reducing environmental impact and promoting a circular economy. </p>

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Sustainable plastic waste separation: enhancing PVC hydrophilicity with natural CaO catalysts for froth flotation

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Nguyen Thi Thanh Truc,
  • Lan Binh Nguyen Thi,
  • Ngoc Sang Nguyen Thi

摘要

Effective plastic waste management is critical for mitigating environmental pollution and advancing sustainability. This study introduces a novel, eco-friendly approach for separating polyvinyl chloride (PVC) from mixed plastic waste using a CaO catalyst derived from natural sources, such as clamshells and eggshells. The method employs ultrasonication-assisted surface treatment with CaO to enhance PVC wettability by hydrating its surface, thereby increasing hydrophilicity. This enables efficient separation via froth flotation, where treated PVC sinks while hydrophobic plastics, like polycarbonate (PC), remain afloat. Experimental results demonstrate a separation efficiency of over 95% for PVC, with the CaO catalyst reducing waste and ensuring an environmentally sustainable process. The technique’s simplicity, cost-effectiveness, and reliance on natural materials highlight its potential for large-scale industrial applications in plastic waste recycling, offering a promising solution for reducing environmental impact and promoting a circular economy.