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<p>In this study, biochar was prepared using agricultural and forestry waste, specifically durian shells, as raw materials. Potassium hydroxide was used to alkali-activate the biochar, followed by the introduction of chitosan for nitrogen doping, and alkaline activated nitrogen doped biochar (NKAC) was successfully prepared. Application to the efficient treatment of uranium-containing wastewater. The research results show that the microstructure of NKAC was significantly improved with enlarged pore size, increased pore volume and increased specific surface area. The adsorption equilibrium of NKAC on U(VI) was reached within 240&#xa0;min, and the maximum adsorption capacity reached 259.63&#xa0;mg/g. The adsorption kinetics and thermodynamic analysis of NKAC for U(VI) indicate that the process aligns with pseudo-second-order kinetics, and the adsorption isotherm is consistent with the Langmuir model, suggesting a spontaneous endothermic reaction. The results of FT-IR and XPS analyses showed that surface complexation between –OH, pyridine nitrogen and pyrrole nitrogen and U(VI) was the main adsorption pathway, while electrostatic adsorption also played a supplementary role. These studies not only provide new ideas for the modification of biochar but also fully demonstrate the excellent performance of NKAC in the treatment of uranium-containing wastewater.</p>

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Preparation of alkali-activated nitrogen-doped durian shell biochar and efficient removal of uranyl ions

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Xiaoxia He,
  • Chao Zhou,
  • Yuanxin Xu,
  • Pengfei Yang

摘要

In this study, biochar was prepared using agricultural and forestry waste, specifically durian shells, as raw materials. Potassium hydroxide was used to alkali-activate the biochar, followed by the introduction of chitosan for nitrogen doping, and alkaline activated nitrogen doped biochar (NKAC) was successfully prepared. Application to the efficient treatment of uranium-containing wastewater. The research results show that the microstructure of NKAC was significantly improved with enlarged pore size, increased pore volume and increased specific surface area. The adsorption equilibrium of NKAC on U(VI) was reached within 240 min, and the maximum adsorption capacity reached 259.63 mg/g. The adsorption kinetics and thermodynamic analysis of NKAC for U(VI) indicate that the process aligns with pseudo-second-order kinetics, and the adsorption isotherm is consistent with the Langmuir model, suggesting a spontaneous endothermic reaction. The results of FT-IR and XPS analyses showed that surface complexation between –OH, pyridine nitrogen and pyrrole nitrogen and U(VI) was the main adsorption pathway, while electrostatic adsorption also played a supplementary role. These studies not only provide new ideas for the modification of biochar but also fully demonstrate the excellent performance of NKAC in the treatment of uranium-containing wastewater.