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<p>Biochar is an excellent adsorbent for organic pollutants, but the removal effect for inorganic phosphorus is not satisfactory. In order to improve its phosphorus removal effect, ZnAl-LDH modified plane trees’ bark biochar was presented in this paper. The plane trees’ bark biochar was prepared by chemical-activation method by utilizing K<sub>2</sub>CO<sub>3</sub> as the activation agent. And then, ZnAl-LDH modified biochar was prepared by in-situ co-precipitation method with ammonia as the precipitate agent. As the sample was as little as 10&#xa0;mg, the adsorption ratio was about 93% for the 25 mL of 20&#xa0;mg/L PO<sub>4</sub><sup>3−</sup>. The saturated adsorption capacity for PO<sub>4</sub><sup>3−</sup> was 103.1&#xa0;mg/g, calculated by Langmuir equation, revealing the adsorption was mainly mono-molecular layer adsorption. The possible adsorption mechanism of phosphate mainly contained interlayer anion exchange, surface complexion and ligand exchange. Moreover, the absorbed sample were soaked in 5.5% Na<sub>2</sub>CO<sub>3</sub> solution for phosphate desorption, nearly 60% of the absorbed phosphate could be recovered and may reuse in the future.</p>

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Preparation of plane trees’ bark biochar/ZnAl-LDH and its adsorption performance for phosphate and recovery

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月1日

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  • Lihui Zhang,
  • Chen Zhang,
  • Caoyang Zhang,
  • Weili Li,
  • Yanbiao Zhou,
  • Yabo Wang,
  • Gangfeng Du

摘要

Biochar is an excellent adsorbent for organic pollutants, but the removal effect for inorganic phosphorus is not satisfactory. In order to improve its phosphorus removal effect, ZnAl-LDH modified plane trees’ bark biochar was presented in this paper. The plane trees’ bark biochar was prepared by chemical-activation method by utilizing K2CO3 as the activation agent. And then, ZnAl-LDH modified biochar was prepared by in-situ co-precipitation method with ammonia as the precipitate agent. As the sample was as little as 10 mg, the adsorption ratio was about 93% for the 25 mL of 20 mg/L PO43−. The saturated adsorption capacity for PO43− was 103.1 mg/g, calculated by Langmuir equation, revealing the adsorption was mainly mono-molecular layer adsorption. The possible adsorption mechanism of phosphate mainly contained interlayer anion exchange, surface complexion and ligand exchange. Moreover, the absorbed sample were soaked in 5.5% Na2CO3 solution for phosphate desorption, nearly 60% of the absorbed phosphate could be recovered and may reuse in the future.