Abstract Antibiotics abuse has been a significant threat to the environment and human health. In this study, we successfully synthesized highly stable amino-functionalized Zr-based metal–organic frameworks (UiO-66-NH2) and studied the adsorption behaviors of norfloxacin (NOR) in water. The adsorption capacities of UiO-66-NH2 reached a maximum of 222.5 mg/g for NOR, which were considerably higher than that of most reported adsorbents. Moreover, the equilibrium time (6 h) was less than that of several previously reported adsorbents. Ionic-strength-influenced experiments showed that NaCl and CaCl2 aqueous solutions could improve the removal efficiency of NOR. The presence of humic acid could barely affect the adsorption amount. At a concentration of 10 mg/L, the highest partition coefficient of 20.9 mg/g/µM was obtained, and the removal rate of NOR was as high as 91.6%, implying that UiO-66-NH2 offered considerable adsorption performance at a low concentration of NOR. In addition, UiO-66-NH2 exhibited good regeneration efficiency, thus offering the possibility to remove norfloxacin from sewage. Finally, several credible adsorption mechanisms were proposed. The results will aid us to comprehend the surface interaction between organic micropollutants and UiO-66-NH2 and prefigure the potential of UiO-66-NH2 as a novel adsorbent for the removal of NOR.

中文翻译：

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使用八面体 UIO-66-NH2 纳米材料高效吸附诺氟沙星：动力学、热力学和机制

摘要 抗生素滥用已严重威胁环境和人类健康。在本研究中，我们成功合成了高度稳定的氨基功能化锆基金属有机骨架（UiO-66-NH2），并研究了诺氟沙星（NOR）在水中的吸附行为。UiO-66-NH2 对 NOR 的吸附容量最高可达 222.5 mg/g，远高于大多数报道的吸附剂。此外，平衡时间（6 小时）比之前报道的几种吸附剂要短。离子强度影响实验表明，NaCl 和 CaCl2 水溶液可以提高 NOR 的去除效率。腐植酸的存在几乎不会影响吸附量。在 10 mg/L 的浓度下，获得了最高的分配系数 20.9 mg/g/µM，NOR 的去除率高达 91.6%，表明 UiO-66-NH2 在低浓度 NOR 下具有相当大的吸附性能。此外，UiO-66-NH2表现出良好的再生效率，从而为从污水中去除诺氟沙星提供了可能。最后，提出了几种可靠的吸附机制。结果将帮助我们理解有机微污染物与 UiO-66-NH2 之间的表面相互作用，并预测 UiO-66-NH2 作为去除 NOR 的新型吸附剂的潜力。