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Abstract：
Two different zinc-based metal-organic frameworks (MOFs) were investigated to remove one of the most used fluoroquinolone antibiotic, Ofloxacin (OFL), from polluted water. The most common zeolitic imidazolate framework-8 (ZIF-8) and the green Zn(II) and benzene-1,3,5-tri-carboxylate (Zn3(BTC)2) were prepared through a facile synthetic route and characterized by means of Fourier-Transform Infrared (FT-IR) Spectroscopy, X-ray Powder Diffraction (XRPD), and Scanning Electron Microscopy (SEM) analyses. The two MOFs were compared in terms of both adsorption and kinetic aspects under real conditions (tap water, natural pH). Results showed that OFL was adsorbed in remarkable amounts, 95 ± 10 and 25.3 ± 0.8 mg g-1 on ZIF-8 and Zn3(BTC)2, respectively, following different mechanisms. Specifically, a Langmuir model well described the ZIF-8 profile, while for Zn3(BTC)2, cooperative adsorption occurred. Moreover the kinetic results were quite different, pseudo-second-order and sigmoidal, respectively. The suitability of ZIF-8 and Zn3(BTC)2 as adsorbent phases for water depollution was tested on tap water samples spiked with OFL 10 µg L-1. The obtained removal efficiencies, of 88% for ZIF-8 and 72% for Zn3(BTC)2, make these materials promising candidates for removing fluoroquinolone antibiotics (FQs) from polluted waters, notwithstanding their limited reusability in tap water, as demonstrated by in-depth characterization of the two MOFs after usage.
摘要：
研究了两种不同的锌基金属有机骨架（MOFs），以去除一种最常用的氟喹诺酮抗生素，氧氟沙星(OFL),从污染的水。最常见的沸石咪唑酯骨架-8（ZIF-8）和绿色Zn（II）和苯-1,3,5-三羧酸酯（Zn3（BTC）2）通过简单的合成路线制备，并通过傅里叶变换红外（FT-IR）光谱，X射线粉末衍射(XRPD)和扫描电子显微镜（SEM）分析。在实际条件下（自来水，自然pH值)。结果表明，OFL被大量吸附，在ZIF-8和Zn3（BTC）2上分别为95±10和25.3±0.8mgg-1，遵循不同的机制。具体来说,Langmuir模型很好地描述了ZIF-8剖面，而对于Zn3(BTC)2,则发生协同吸附。而且动力学结果大不相同，伪二阶和S形，分别。在掺有OFL10µgL-1的自来水样品上测试了ZIF-8和Zn3（BTC）2作为吸附剂相对水污染的适用性。获得的去除效率，88%的ZIF-8和72%的Zn3（BTC）2，使这些材料有希望的候选去除氟喹诺酮抗生素（FQs）从污染的水，尽管它们在自来水中的可重复使用性有限，如使用后对两种MOF的深入表征所示。
