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<p>Malachite green (MG) is a critical environmental dilemma, threatening ecological ecosystems and human health. Despite the different proposed agents for MG removal, this study, for the first time, presents an efficient and cost-effective adsorbent based on oil sludge (OS). Regarding the considerable release of unmanaged OS from the petrochemical industry and its health hazards, it was used as a precious resource for adsorbent synthesis. The OS-derived adsorbents inherently contained iron, forming magnetic phases and Fe–O active sites during synthesis. Their mesoporous framework enhanced mass transfer, resulting in high adsorption capacities of 990.38 and 1030.4 mg/g for magnetic char and activated carbon, respectively. The optimum conditions were pH of 8, MG concentration of 200 mg/L, adsorbent dose of 0.01 g, and contact time of 5 min at room temperature. The MG adsorption followed pseudo-second-order kinetics and the Freundlich model, indicating a multilayer physical adsorption process. Besides the high iron content of OS, more investigations considering economic and environmental perspectives are required for proposing scale-up applications.</p> Graphical Abstract <p></p>

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A Comparative Study of Magnetic Char and Activated Carbon Derived from Oil Sludge for Malachite Green Removal

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • Rogheyeh Motallebi,
  • Hassan Rezaei,
  • Hajar Abyar

摘要

Malachite green (MG) is a critical environmental dilemma, threatening ecological ecosystems and human health. Despite the different proposed agents for MG removal, this study, for the first time, presents an efficient and cost-effective adsorbent based on oil sludge (OS). Regarding the considerable release of unmanaged OS from the petrochemical industry and its health hazards, it was used as a precious resource for adsorbent synthesis. The OS-derived adsorbents inherently contained iron, forming magnetic phases and Fe–O active sites during synthesis. Their mesoporous framework enhanced mass transfer, resulting in high adsorption capacities of 990.38 and 1030.4 mg/g for magnetic char and activated carbon, respectively. The optimum conditions were pH of 8, MG concentration of 200 mg/L, adsorbent dose of 0.01 g, and contact time of 5 min at room temperature. The MG adsorption followed pseudo-second-order kinetics and the Freundlich model, indicating a multilayer physical adsorption process. Besides the high iron content of OS, more investigations considering economic and environmental perspectives are required for proposing scale-up applications.

Graphical Abstract