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<p>Long-root <i>Eichhornia crassipes</i>, an aquatic plant with extensive root systems, has demonstrated potential in remediating eutrophicated water bodies. However, improper disposal of large quantities of discarded plants post-remediation can easily cause secondary pollution. In this study, rapidly recoverable magnetic carbon quantum dots (MCQDs) were greenly synthesized via hydrothermal treatment of long-root <i>Eichhornia crassipes</i> and subsequent coupling with Fe<sub>3</sub>O<sub>4</sub> nanoparticles. Adsorption experiments demonstrated that MCQDs displayed a commendable adsorption capacity for various heavy metals in municipal wastewater under the synergistic effect of CODs and Fe<sub>3</sub>O<sub>4</sub>. Mechanistic analyses revealed that the adsorption involved chemical binding with oxygen-containing functional groups and amino groups on the surface of MCOQs. The saturated MCQDs were efficiently recovered within 5&#xa0;min using an applied magnetic field, offering a practical solution for nanoparticle recovery. This study provides valuable insights into the green resource utilization of Long-root <i>Eichhornia crassipes</i> based on CQD technology.</p> Graphical abstract

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Long-root Eichhornia crassipes waste plants dual-purpose resource utilization: green preparation of magnetic carbon quantum dots for heavy metal deep removal

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月28日

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  • Yihong Guo,
  • Mingxin Cui,
  • Hongjun Yang,
  • Jun Chen,
  • Sen Lin

摘要

Long-root Eichhornia crassipes, an aquatic plant with extensive root systems, has demonstrated potential in remediating eutrophicated water bodies. However, improper disposal of large quantities of discarded plants post-remediation can easily cause secondary pollution. In this study, rapidly recoverable magnetic carbon quantum dots (MCQDs) were greenly synthesized via hydrothermal treatment of long-root Eichhornia crassipes and subsequent coupling with Fe3O4 nanoparticles. Adsorption experiments demonstrated that MCQDs displayed a commendable adsorption capacity for various heavy metals in municipal wastewater under the synergistic effect of CODs and Fe3O4. Mechanistic analyses revealed that the adsorption involved chemical binding with oxygen-containing functional groups and amino groups on the surface of MCOQs. The saturated MCQDs were efficiently recovered within 5 min using an applied magnetic field, offering a practical solution for nanoparticle recovery. This study provides valuable insights into the green resource utilization of Long-root Eichhornia crassipes based on CQD technology.

Graphical abstract