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<p>This study focuses on the preparation and characterization of a novel highly efficient activated carbon (new-AC) and a low-cost adsorbent (BM) from a mixture of agro-based wastes to remove toxic Cr(VI). BM was obtained by mixing wastes subjected to some specific preparation processes in equal proportions, while new-AC was produced by pyrolyzing BM chemically activated with KOH. Various techniques such as elemental analysis, BET-surface area (S<sub>BET</sub>), pore size and volume measurements, pH<sub>pzc</sub>, FTIR, Boehm titration, and SEM–EDX analysis were employed for the characterization of adsorbents. The findings revealed that new-AC exhibited a greater S<sub>BET</sub>, carbon content, and more acidic surface (1413 m<sup>2</sup>/g, 91.9% C, and pH<sub>pzc</sub> of 6.8) compared to BM (5.32 m<sup>2</sup>/g, 51.08% C, and pH<sub>pzc</sub> of 7.8). Adsorption experiments were performed to evaluate the efficiency of each adsorbent, with results compared against a commercial activated carbon (com-AC) for Cr(VI) removal. The optimal conditions for removing 50&#xa0;mg-Cr(VI)/L were identified as pH 2, 4&#xa0;g/L dosage, and 30&#xa0;min contact time for new-AC; pH 2, 5&#xa0;g/L dosage, and 90&#xa0;min for com-AC; and pH 2, 20&#xa0;g/L dosage, and 60&#xa0;min for BM. The maximum adsorption capacities observed for BM, new-AC, and com-AC were 6.46, 51.55, and 41.67&#xa0;mg/g of Cr(VI), respectively. The adsorption behavior for all three adsorbents aligned well with the Langmuir isotherm model, and thermodynamic analysis suggested that the adsorption processes were exothermic, spontaneous, and favorable.</p>

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Preparation and Characterization of Low-Cost Bio-Sorbent and a Novel Activated Carbon from Agro-Wastes for Efficient Cr(VI) Removal

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月4日

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  • Mehmet Erdem,
  • Ayşegül Öner

摘要

This study focuses on the preparation and characterization of a novel highly efficient activated carbon (new-AC) and a low-cost adsorbent (BM) from a mixture of agro-based wastes to remove toxic Cr(VI). BM was obtained by mixing wastes subjected to some specific preparation processes in equal proportions, while new-AC was produced by pyrolyzing BM chemically activated with KOH. Various techniques such as elemental analysis, BET-surface area (SBET), pore size and volume measurements, pHpzc, FTIR, Boehm titration, and SEM–EDX analysis were employed for the characterization of adsorbents. The findings revealed that new-AC exhibited a greater SBET, carbon content, and more acidic surface (1413 m2/g, 91.9% C, and pHpzc of 6.8) compared to BM (5.32 m2/g, 51.08% C, and pHpzc of 7.8). Adsorption experiments were performed to evaluate the efficiency of each adsorbent, with results compared against a commercial activated carbon (com-AC) for Cr(VI) removal. The optimal conditions for removing 50 mg-Cr(VI)/L were identified as pH 2, 4 g/L dosage, and 30 min contact time for new-AC; pH 2, 5 g/L dosage, and 90 min for com-AC; and pH 2, 20 g/L dosage, and 60 min for BM. The maximum adsorption capacities observed for BM, new-AC, and com-AC were 6.46, 51.55, and 41.67 mg/g of Cr(VI), respectively. The adsorption behavior for all three adsorbents aligned well with the Langmuir isotherm model, and thermodynamic analysis suggested that the adsorption processes were exothermic, spontaneous, and favorable.