Antibiotic contaminants in water and wastewater can cause serious damage to the environment and human health. Hence, their effective removal from water matrices is crucial. Effective removal of antibiotics using the adsorption process is a promising technique thanks to its easy regeneration, low cost, and high efficiency. In this work, the adsorption of amoxicillin (AMX) was investigated on a synthesized flexible metal–organic framework MIL-53(Al). The MIL-53(Al) adsorbent with a high surface area was synthesized using the hydrothermal method. It was then characterized by N₂ adsorption–desorption, FE-SEM, TEM, XRD, FT-IR, EDS, and TG analyses. The batch adsorption experiments were performed to examine the effects of solution pH, ionic strength, contact time, adsorbent dosage, and initial AMX concentration. Furthermore, the adsorption mechanism and adsorption kinetics as well as isotherms were studied experimentally. The adsorption kinetics indicated that the adsorption process was more compatible with the pseudo-second-order kinetic model. The equilibrium adsorption data were well fitted using the Langmuir model. The MIL-53(Al) exhibited an excellent saturated adsorption capacity of 758.5 mg g^–1 at 303 K and pH = 7.5 ± 0.1, surpassing all previous reported MOF-based adsorbents. The adsorption process was spontaneous and exothermic, although the entropy value decreased during the adsorption process. Furthermore, the MIL-53(Al) adsorbent had a good regeneration and reusability such that the adsorption capacity diminished slightly after reuse for four cycles. These results revealed that MIL-53(Al) would be a promising adsorbent for the adsorption of AMX from water matrices for environmental protection.

中文翻译：

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使用有效且可回收的MIL-53（Al）金属-有机骨架吸附剂从水基质中吸附和解吸阿莫西林抗生素

水和废水中的抗生素污染物会严重破坏环境和人类健康。因此，从水基质中有效去除它们至关重要。由于其易于再生，低成本和高效率，使用吸附工艺有效去除抗生素是一种很有前途的技术。在这项工作中，研究了阿莫西林（AMX）在合成的柔性金属-有机骨架MIL-53（Al）上的吸附。使用水热法合成了具有高表面积的MIL-53（Al）吸附剂。然后用N ₂表征吸附-解吸，FE-SEM，TEM，XRD，FT-IR，EDS和TG分析。进行分批吸附实验以检查溶液pH值，离子强度，接触时间，吸附剂剂量和初始AMX浓度的影响。此外，还对吸附机理和吸附动力学以及等温线进行了实验研究。吸附动力学表明，吸附过程与拟二级动力学模型更兼容。使用Langmuir模型可以很好地拟合平衡吸附数据。MIL-53（Al）表现出出色的饱和吸附容量，为758.5 mg g ^–1在303 K和pH = 7.5±0.1的条件下，超过了以前报道的所有基于MOF的吸附剂。尽管熵值在吸附过程中降低，但吸附过程是自发的且放热的。此外，MIL-53（Al）吸附剂具有良好的再生和可重复使用性，因此在重复使用四个循环后，吸附容量会略有下降。这些结果表明，MIL-53（Al）将是一种有前途的吸附剂，可用于从水基质中吸附AMX以保护环境。