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<p>A novel, reusable biomass-derived adsorbent biochar material, referred to as WS, was developed by pyrolyzing ball-milled walnut shell powder under an inert gas atmosphere, followed by chemical activation with sodium hydroxide (NaOH). The resulting biochar WS demonstrated rapid adsorption capabilities for trinitrotoluene (TNT) from wastewater, achieving equilibrium within 30&#xa0;min. The maximum adsorption capacity was determined to be 107.0&#xa0;mg·g<sup>−1</sup>. Adsorption data were well-described by the Langmuir isotherm model and the pseudo-second-order kinetic model, indicating favorable adsorption characteristics. The efficient removal of TNT by WS was attributed to a synergistic mechanism involving electrostatic attraction and chemisorption.</p>

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Biocarbon nanoadsorbents derived from walnut shell and their excellent adsorption of trinitrotoluene from wastewater

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月14日

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  • Xiaofeng Shi,
  • Shilin Cao,
  • Chao Si,
  • Zhenguo Liu,
  • Yu Dong,
  • Jiaji Sun

摘要

A novel, reusable biomass-derived adsorbent biochar material, referred to as WS, was developed by pyrolyzing ball-milled walnut shell powder under an inert gas atmosphere, followed by chemical activation with sodium hydroxide (NaOH). The resulting biochar WS demonstrated rapid adsorption capabilities for trinitrotoluene (TNT) from wastewater, achieving equilibrium within 30 min. The maximum adsorption capacity was determined to be 107.0 mg·g−1. Adsorption data were well-described by the Langmuir isotherm model and the pseudo-second-order kinetic model, indicating favorable adsorption characteristics. The efficient removal of TNT by WS was attributed to a synergistic mechanism involving electrostatic attraction and chemisorption.