Superhydrophobic fluorinated metal–organic framework (MOF) devices for high-efficiency oil–water separation,Inorganic Chemistry Frontiers

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Superhydrophobic fluorinated metal–organic framework (MOF) devices for high-efficiency oil–water separation
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2024-07-18 , DOI: 10.1039/d4qi01613k
Jiaqi Ma ₁ , Mingshi Zhang _{1,

2} , Rui Feng ₃ , Lu Dong ₁ , Wei Sun ₄ , Yanyuan Jia _{1,

5}

Affiliation

Oil spills have been a persistent environmental challenge globally, resulting in severe long-term impacts. Thus, developing materials for efficient oil–water separation is crucial. Metal–organic frameworks (MOFs), as a rapidly emerging class of porous materials, have gained tremendous attention due to their ultra-high surface area. In this study, four fluorinated MOFs with UiO-66 topology were synthesized and characterized. Their hydrophobicity was tailored by varying the types and quantities of the fluorine-containing functional groups (–F or –CF₃) on the ligands. Among them, 2CF₃-UiO-66 showed the highest hydrophobicity, with a water contact angle (WCA) of 145.9°, making it promising for adsorbing organic pollutants and as a hydrophobic coating material. 2CF₃-UiO-66 powder efficiently reduced the concentration of 3,5-dichlorophenol (a model halogenated water pollutant) from 300 ppm to 23.4 ppm within 2 hours. Furthermore, 2CF₃-UiO-66 was in situ coated on cotton (CT) and sponge (SP) to form composite materials, 2CF₃-UiO-66@CT and 2CF₃-UiO-66@SP. 2CF₃-UiO-66@CT is superhydrophobic (WCA = 164.7°), flexible, and fire retardant. It efficiently separated water and nine organic solvents via filtration, meeting commercial standards of <0.01% water content in the filtered organic solvents. 2CF₃-UiO-66@CT remains structurally intact after 20 filtration recycles, suggesting its durability. These advantages make the 2CF₃-UiO-66@CT an ideal candidate for oil–water separation via filtration. Alternatively, 2CF₃-UiO-66@SP, with a porous sponge backbone, is suitable for oil–water separation by adsorbing the organic phase efficiently (60–140 g g⁻¹ adsorption capacity on nine organic solvents), and the adsorbed oil can be easily pumped out. Overall, we believe the fluorinated MOFs reported in this work have great potential for adsorption and superhydrophobic coating applications.

中文翻译：

用于高效油水分离的超疏水氟化金属有机骨架（MOF）装置

石油泄漏一直是全球持续存在的环境挑战，造成了严重的长期影响。因此，开发有效油水分离的材料至关重要。金属有机框架（MOF）作为一类快速新兴的多孔材料，由于其超高的比表面积而受到了极大的关注。在本研究中，合成并表征了四种具有 UiO-66 拓扑结构的氟化 MOF。它们的疏水性是通过改变配体上含氟官能团（-F或-CF ₃ ）的类型和数量来定制的。其中，2CF ₃ -UiO-66表现出最高的疏水性，水接触角（WCA）为145.9°，使其有望用于吸附有机污染物和作为疏水涂层材料。 2CF ₃ -UiO-66粉末在2小时内有效地将3,5-二氯苯酚（一种卤化水污染物）的浓度从300 ppm降低至23.4 ppm。此外，将2CF ₃ -UiO-66原位涂覆在棉花（CT）和海绵（SP）上形成复合材料2CF ₃ -UiO-66@CT和2CF < b5> -UiO-66@SP。 2CF ₃ -UiO-66@CT 具有超疏水性（WCA = 164.7°）、柔韧且阻燃。它通过过滤有效分离水和九种有机溶剂，满足过滤后的有机溶剂中水含量<0.01%的商业标准。 2CF ₃ -UiO-66@CT 在 20 次过滤循环后仍保持结构完整，表明其耐用性。这些优点使 2CF ₃ -UiO-66@CT 成为通过过滤进行油水分离的理想选择。另外，2CF ₃ -UiO-66@SP 具有多孔海绵骨架，适合通过有效吸附有机相进行油水分离（60–140 g g ⁻¹ 吸附容量）九种有机溶剂），吸附的油可以很容易地泵出。总的来说，我们相信这项工作中报道的氟化 MOF 在吸附和超疏水涂层应用方面具有巨大的潜力。

更新日期：2024-07-23

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