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<p>Aquatic chromium (Cr) contamination presents a persistent and severe threat to both ecological integrity and public health. This study systematically investigates the enhanced adsorption performance and mechanisms of iron-modified reed straw biochar (FeBC) for the simultaneous removal of trivalent (Cr(III)) and hexavalent chromium (Cr(VI)) from aqueous solutions. Compared to the pristine biochar (BC), FeBC exhibited significantly higher removal efficiencies, achieving 78.78% for Cr(III) and 91.45% for Cr(VI) under optimal conditions (pH 4–6). Adsorption followed the Langmuir isotherm and pseudo-second-order kinetic models, indicating monolayer chemisorption as the dominant mechanism. Thermodynamic analysis confirmed the spontaneous and endothermic nature of the process. Material characterization revealed that Fe modification substantially increased specific surface area (from 51.93 to 134.76 m<sup>2</sup>/g), pore volume, and introduced Fe₃O₄ crystals, which enhanced adsorption sites and redox activity. Collectively, these findings highlight FeBC as a highly promising and sustainable candidate for the efficient remediation of chromium-impacted water.</p>

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Iron-Modified Reed Straw Biochar for Efficient Simultaneous Removal of Cr(III) and Cr(VI): Role of Adsorption and Reduction

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Yanhao Zhang,
  • Jiyao Zhu,
  • Xizhao Pan,
  • Yanwei Zhong,
  • Lei Zhang,
  • Xu Zhang,
  • Zhibin Zhang

摘要

Aquatic chromium (Cr) contamination presents a persistent and severe threat to both ecological integrity and public health. This study systematically investigates the enhanced adsorption performance and mechanisms of iron-modified reed straw biochar (FeBC) for the simultaneous removal of trivalent (Cr(III)) and hexavalent chromium (Cr(VI)) from aqueous solutions. Compared to the pristine biochar (BC), FeBC exhibited significantly higher removal efficiencies, achieving 78.78% for Cr(III) and 91.45% for Cr(VI) under optimal conditions (pH 4–6). Adsorption followed the Langmuir isotherm and pseudo-second-order kinetic models, indicating monolayer chemisorption as the dominant mechanism. Thermodynamic analysis confirmed the spontaneous and endothermic nature of the process. Material characterization revealed that Fe modification substantially increased specific surface area (from 51.93 to 134.76 m2/g), pore volume, and introduced Fe₃O₄ crystals, which enhanced adsorption sites and redox activity. Collectively, these findings highlight FeBC as a highly promising and sustainable candidate for the efficient remediation of chromium-impacted water.