The increasingly severe issue of antibiotic-induced pollution greatly stimulates the development of high-performance advanced adsorbents. In this contribution, a novel Fe-centered metal–organic aerogel (Fe-MOA) was synthesized through the use of bio-based ligand 2,5-furandicarboxylic acid (FDCA). Various characterization techniques including FT-IR, XPS, SEM, TEM, EDX and N₂ adsorption–desorption analysis verified the successful preparation of the Fe-MOA with a hierarchically meso and macroporous network structure. The Fe-MOA was subsequently used as an adsorbent for the removal of tetracycline (TC) in aqueous solution. And the results suggested that the Fe-MOA exhibited an unprecedented adsorption capacity for TC with the record value of 1023 mg g⁻¹. The adsorption equilibrium and isotherm data agreed well with the pseudo-second-order and Freundlich models, respectively. The mechanism investigations showed that the ultrahigh adsorption capability was synergistically driven by multiple affinities including electrostatic interaction, hydrogen bonding, surface complexation and π–π interactions between the conjugated groups in TC and the furan rings of the Fe-MOA. The recycling adsorption experiment results showed that the Fe-MOA retained 80% of the 1st-cycle adsorption capacity after being reused for 5 cycles, demonstrating the excellent reusability of Fe-MOA. Compared with other adsorbents, the ultrahigh TC adsorption capacity and excellent recycling performance make the Fe-MOA a favorable adsorbent candidate for TC pollution, highlighting the significant potential for solving practical TC-related pollution issues.

中文翻译：

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一种用于从水溶液中捕获四环素的生物基金属有机气凝胶 (MOA) 吸附剂

日益严重的抗生素引起的污染问题极大地刺激了高性能先进吸附剂的发展。在这项贡献中，通过使用生物基配体 2,5-呋喃二甲酸 (FDCA) 合成了一种新型的以铁为中心的金属有机气凝胶 (Fe-MOA)。包括FT-IR、XPS、SEM、TEM、EDX和N ₂吸附-解吸分析在内的各种表征技术证实了具有分级介孔和大孔网络结构的Fe-MOA的成功制备。Fe-MOA 随后用作吸附剂以去除水溶液中的四环素 (TC)。结果表明，Fe-MOA 对 TC 表现出前所未有的吸附能力，创纪录的值为 1023 mg g ^-1. 吸附平衡和等温线数据分别与伪二阶和 Freundlich 模型一致。机理研究表明，超高吸附能力是由多种亲和力协同驱动的，包括静电相互作用、氢键、表面络合和 TC 共轭基团与 Fe-MOA 呋喃环之间的 π-π 相互作用。回收吸附实验结果表明，Fe-MOA在重复使用5次后，仍保留了第一次循环吸附容量的80%，证明了Fe-MOA的优异重复使用性。与其他吸附剂相比，超高的 TC 吸附容量和优异的回收性能使 Fe-MOA 成为 TC 污染的有利吸附剂候选者，