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<p>Chromium pollution is a pervasive concern that demands an efficient treatment solution. The authors employed polypyrrole (PPy) modified corn stover biochar (CSB) to remediate Cr(VI)-contaminated soil. PPy-CSB significantly lowered the leachability of Cr(VI) according to the toxicity characteristic leaching procedure (TCLP) in the soil below 3&#xa0;mg/kg within 50&#xa0;days, from the initial values ranging from 200 to 1000&#xa0;mg/kg. In eluviation experiments, soil treated with PPy-CSB exhibited a Cr(VI) release rate of 59.0%, which was substantially lower than the 84.3% from control soil and 81.8% from CSB-treated soil. Analysis of soil characteristics demonstrated that PPy-CSB effectively reduced Cr(VI) to the less toxic Cr(III) by the action of major functional groups (in order of activity): -C–OH, = N-, -NH-, and N–O-C, which were oxidized to C = O, C-O, NH<sup>3+</sup>, C–C/C-H and -C–O–C-. In conclusion, the findings present PPy-CSB as a cost-effective and efficient solution for remediating Cr(VI) contaminated soil.</p> Graphical Abstract <p></p>

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Efficient Remediation of Cr(VI) in Soil by Polypyrrole Modified Corn-Stover Biochar

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Yiping Guo,
  • Weijie Feng,
  • Qianqian Zhang,
  • Wanfei Shao,
  • Xiangkai Tao,
  • Weigao Zhao,
  • Sang-Hyoun Kim,
  • K. C. Surendra,
  • Samir Kumar Khanal

摘要

Chromium pollution is a pervasive concern that demands an efficient treatment solution. The authors employed polypyrrole (PPy) modified corn stover biochar (CSB) to remediate Cr(VI)-contaminated soil. PPy-CSB significantly lowered the leachability of Cr(VI) according to the toxicity characteristic leaching procedure (TCLP) in the soil below 3 mg/kg within 50 days, from the initial values ranging from 200 to 1000 mg/kg. In eluviation experiments, soil treated with PPy-CSB exhibited a Cr(VI) release rate of 59.0%, which was substantially lower than the 84.3% from control soil and 81.8% from CSB-treated soil. Analysis of soil characteristics demonstrated that PPy-CSB effectively reduced Cr(VI) to the less toxic Cr(III) by the action of major functional groups (in order of activity): -C–OH, = N-, -NH-, and N–O-C, which were oxidized to C = O, C-O, NH3+, C–C/C-H and -C–O–C-. In conclusion, the findings present PPy-CSB as a cost-effective and efficient solution for remediating Cr(VI) contaminated soil.

Graphical Abstract