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<p>In this study, a novel phosphorus-doped kitchen waste biochar (P-KWBC) was prepared through sodium phosphate-assisted copyrolysis. This simple and low-cost adsorbent achieved a remarkable uranium adsorption capacity of 655.13&#xa0;mg/g under weakly acidic conditions (pH = 4, 313.15&#xa0;K), which was more than 500% greater than that of kitchen&#xa0;waste biochar. After five consecutive adsorption‒desorption cycles, the material maintained a high uranium removal efficiency of 90.93%. Quantitative mechanism analysis confirmed that ion exchange (41.09%), mineral precipitation (28.23%), π–π interactions (19.69%), and coordination (10.97%) dominated U(VI) removal. This work provides a waste-to-wealth strategy for simultaneous kitchen waste reuse and uranium-contaminated wastewater treatment.</p>

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Novel phosphorus-doped kitchen waste biochar: adsorption performance and mechanism for U(VI) removal from wastewater

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Guohua Wang,
  • Xu Luo,
  • Jie Tian,
  • Wenbo Lv,
  • Jiale Zhang,
  • Zhuhu Yi,
  • Jun Tong,
  • Shiyou Li

摘要

In this study, a novel phosphorus-doped kitchen waste biochar (P-KWBC) was prepared through sodium phosphate-assisted copyrolysis. This simple and low-cost adsorbent achieved a remarkable uranium adsorption capacity of 655.13 mg/g under weakly acidic conditions (pH = 4, 313.15 K), which was more than 500% greater than that of kitchen waste biochar. After five consecutive adsorption‒desorption cycles, the material maintained a high uranium removal efficiency of 90.93%. Quantitative mechanism analysis confirmed that ion exchange (41.09%), mineral precipitation (28.23%), π–π interactions (19.69%), and coordination (10.97%) dominated U(VI) removal. This work provides a waste-to-wealth strategy for simultaneous kitchen waste reuse and uranium-contaminated wastewater treatment.