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<p>Graphite has the potential to mediate the reduction process of Cr(VI) by oxalic acid (OA), but a reasonable modification is required to enhance the mediation of electron transfer. In this study, biosynthetic Schwertmannite (<i>Sch</i>) modified graphite (<i>Sch</i>@G) was pyrolyzed at 700°C for Cr(VI) remediation. Biosynthetic <i>Sch</i> particles were successfully loaded on the graphite, providing high specific surface area and abundant O-containing functional groups. The removal efficiency of Cr(VI) reached 90.42% within 60 min, facilitated by the synergistic between 1 g/L <i>Sch</i>@G and 1 mmol/L OA. Additionally, the comparative experiments exhibited a significant capacity of <i>Sch</i>@G in a wide pH range (pH 2–10), the removal efficiency was 97.9% within 60 min even at pH 10. Furthermore, the catalyst presented superior environmental adaptability in solutions containing various types of anions (Cl<sup>−</sup>, SO<sub>4</sub><sup>2−</sup>, NO<sub>3</sub><sup>−</sup>, H<sub>2</sub>PO<sub>4</sub><sup>−</sup>). Mechanism analysis revealed that the catalyst greatly promotes the transfer of electrons from OA to Cr-contaminants, along with the release of low-valent Fe from <i>Sch</i>, enabling efficient electrons transfer to the Cr-contaminant. Meanwhile, the addition of OA could complex OA-Cr(VI) compound, lowering the activity of Cr(VI) and facilitating the subsequent Cr(VI) removal. Generally, the synergistic effect of the catalyst and OA can form an efficient system that enables rapid and effective remediation of Cr(VI) contamination across a wide pH range. Thus, the catalyst presents as a promising graphite-based biomaterial for the rapid and effective remediation of Cr(VI) contaminants from wastewater.</p>

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Collaborative strategy for elevated reduction of Cr(VI) through pyrolyzed graphite-based biosynthetic Schwertmannite composite catalyzed by oxalic acid

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Chen-zi Huang,
  • Jun-wen Chen,
  • Jian-cheng Chen,
  • Yao Xiong,
  • Peng-hui Li,
  • Jian-yu Zhu,
  • Min Gan

摘要

Graphite has the potential to mediate the reduction process of Cr(VI) by oxalic acid (OA), but a reasonable modification is required to enhance the mediation of electron transfer. In this study, biosynthetic Schwertmannite (Sch) modified graphite (Sch@G) was pyrolyzed at 700°C for Cr(VI) remediation. Biosynthetic Sch particles were successfully loaded on the graphite, providing high specific surface area and abundant O-containing functional groups. The removal efficiency of Cr(VI) reached 90.42% within 60 min, facilitated by the synergistic between 1 g/L Sch@G and 1 mmol/L OA. Additionally, the comparative experiments exhibited a significant capacity of Sch@G in a wide pH range (pH 2–10), the removal efficiency was 97.9% within 60 min even at pH 10. Furthermore, the catalyst presented superior environmental adaptability in solutions containing various types of anions (Cl−, SO42−, NO3−, H2PO4−). Mechanism analysis revealed that the catalyst greatly promotes the transfer of electrons from OA to Cr-contaminants, along with the release of low-valent Fe from Sch, enabling efficient electrons transfer to the Cr-contaminant. Meanwhile, the addition of OA could complex OA-Cr(VI) compound, lowering the activity of Cr(VI) and facilitating the subsequent Cr(VI) removal. Generally, the synergistic effect of the catalyst and OA can form an efficient system that enables rapid and effective remediation of Cr(VI) contamination across a wide pH range. Thus, the catalyst presents as a promising graphite-based biomaterial for the rapid and effective remediation of Cr(VI) contaminants from wastewater.