Scholarlink

<p>The escalating issue of nitrate-nitrogen (NO<sub>3</sub><sup>−</sup>–N) pollution in water bodies demands advanced remediation solutions. This study developed engineered iron-modified biochar (FeB) via a sequential acid-washing and FeCl<sub>3</sub>-impregnation strategy to enhance NO<sub>3</sub><sup>−</sup>–N adsorption. Comprehensive characterization (SEM, FTIR, XRD, and XPS) confirmed that the modification successfully optimized the pore structure, enriched oxygen-containing functional groups, and loaded active Fe<sub>2</sub>O<sub>3</sub> particles. FeB exhibited a reversed positive surface charge (zeta potential =  + 7.58&#xa0;mV), favoring anion capture. Adsorption isotherms were well-described by the Langmuir model, revealing a maximum adsorption capacity of 6829.74&#xa0;mg/kg, which is more than three times that of pristine biochar. Kinetic studies indicated that the process followed the pseudo-second-order model, suggesting a chemisorption-dominated mechanism. Detailed mechanistic analysis demonstrated that nitrate removal was synergistically governed by electrostatic attraction, ligand exchange (forming inner-sphere complexes), and physical pore filling. Crucially, FeB achieved high adsorption efficiency under neutral pH (7.0) with a low dosage (1.0&#xa0;g/L) and exhibited excellent structural stability after adsorption. This work provides a robust, scalable adsorbent for mitigating aquatic NO<sub>3</sub><sup>−</sup>–N contamination, showing significant potential for practical applications in wastewater treatment and constructed wetlands.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Porosity optimization and Fe2O3 functionalization synergistically enhance nitrate adsorption on bamboo biochar

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月10日

查看全文
  • Wen Jia,
  • Lei Zhang,
  • Yan Chen,
  • Hong Xu,
  • Jing Wang,
  • Fan Yang,
  • LiuYan Yang

摘要

The escalating issue of nitrate-nitrogen (NO3−–N) pollution in water bodies demands advanced remediation solutions. This study developed engineered iron-modified biochar (FeB) via a sequential acid-washing and FeCl3-impregnation strategy to enhance NO3−–N adsorption. Comprehensive characterization (SEM, FTIR, XRD, and XPS) confirmed that the modification successfully optimized the pore structure, enriched oxygen-containing functional groups, and loaded active Fe2O3 particles. FeB exhibited a reversed positive surface charge (zeta potential =  + 7.58 mV), favoring anion capture. Adsorption isotherms were well-described by the Langmuir model, revealing a maximum adsorption capacity of 6829.74 mg/kg, which is more than three times that of pristine biochar. Kinetic studies indicated that the process followed the pseudo-second-order model, suggesting a chemisorption-dominated mechanism. Detailed mechanistic analysis demonstrated that nitrate removal was synergistically governed by electrostatic attraction, ligand exchange (forming inner-sphere complexes), and physical pore filling. Crucially, FeB achieved high adsorption efficiency under neutral pH (7.0) with a low dosage (1.0 g/L) and exhibited excellent structural stability after adsorption. This work provides a robust, scalable adsorbent for mitigating aquatic NO3−–N contamination, showing significant potential for practical applications in wastewater treatment and constructed wetlands.