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<p>The persistent presence of antibiotics in aquatic ecosystems poses severe risks to environmental and human health. Herein, we report a novel&#xa0;dopamine-modified Fe<sub>3</sub>O<sub>4</sub>@C@DA nanocomposite&#xa0;synthesized via covalent amidation for efficient antibiotic removal. The material’s core–shell structure integrates Fe<sub>3</sub>O<sub>4</sub> nanoparticles with a carbon matrix, functionalized by dopamine to enhance hydrophilicity and stability. Comprehensive characterization confirmed successful dopamine grafting, yielding a superparamagnetic adsorbent (41.0&#xa0;emu/g). The adsorbent demonstrated exceptional performance for ciprofloxacin (CIP) and tetracycline (TC), achieving&#xa0;maximum capacities of 42.5&#xa0;mg/g (CIP) and 28.4&#xa0;mg/g (TC). Kinetic studies revealed rapid equilibration within&#xa0;8&#xa0;h (CIP) and 6&#xa0;h (TC), well-described by pseudo-second-order kinetics (R<sup>2</sup> &gt; 0.999), while Langmuir isotherms (R<sup>2</sup> &gt; 0.98) indicated monolayer chemisorption dominated by&#xa0;hydrogen bonding, π-π interactions, and electrostatic attraction. Remarkably, the material retained &gt; 60% adsorption efficiency after five regeneration cycles. This work advances antibiotic remediation by synergizing covalent functionalization, multi-mechanistic adsorption, and scalable design, offering a sustainable solution for water purification.</p>

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A Novel Strategy for Antibiotic Removal from Wastewater: Dopamine-Modified Fe3O4@C@DA Composite Nanomaterial Adsorbent

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Xiangnan Zhang,
  • Junhan Dai,
  • Jie Ding,
  • Zheng Li,
  • Yuye Zhang,
  • Hongbo Li,
  • Na Li

摘要

The persistent presence of antibiotics in aquatic ecosystems poses severe risks to environmental and human health. Herein, we report a novel dopamine-modified Fe3O4@C@DA nanocomposite synthesized via covalent amidation for efficient antibiotic removal. The material’s core–shell structure integrates Fe3O4 nanoparticles with a carbon matrix, functionalized by dopamine to enhance hydrophilicity and stability. Comprehensive characterization confirmed successful dopamine grafting, yielding a superparamagnetic adsorbent (41.0 emu/g). The adsorbent demonstrated exceptional performance for ciprofloxacin (CIP) and tetracycline (TC), achieving maximum capacities of 42.5 mg/g (CIP) and 28.4 mg/g (TC). Kinetic studies revealed rapid equilibration within 8 h (CIP) and 6 h (TC), well-described by pseudo-second-order kinetics (R2 > 0.999), while Langmuir isotherms (R2 > 0.98) indicated monolayer chemisorption dominated by hydrogen bonding, π-π interactions, and electrostatic attraction. Remarkably, the material retained > 60% adsorption efficiency after five regeneration cycles. This work advances antibiotic remediation by synergizing covalent functionalization, multi-mechanistic adsorption, and scalable design, offering a sustainable solution for water purification.