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首页> 外文期刊>Chemistry: A European journal >Metal Oxide Assisted Preparation of Core-Shell Beads with Dense Metal-Organic Framework Coatings for the Enhanced Extraction of Organic Pollutants
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Metal Oxide Assisted Preparation of Core-Shell Beads with Dense Metal-Organic Framework Coatings for the Enhanced Extraction of Organic Pollutants

机译：金属氧化物辅助制备具有重金属有机骨架涂层的核-壳珠，以增强有机污染物的萃取

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摘要

Dense and homogeneous metal-organic framework (MOF) coatings on functional bead surfaces are easily prepared by using intermediate sacrificial metal oxide coatings containing the metal precursor of the MOF. Polystyrene (PS) beads are coated with a ZnO layer to give ZnO@PS core-shell beads. The ZnO@PS beads are reactive in the presence of 2-methylimidazole to transform part of the ZnO coating into a porous zeolitic imidazolate framework-8 (ZIF-8) external shell positioned above the internal ZnO precursor shell. The obtained ZIF-8@ZnO@PS beads can be easily packed in column format for flow-through applications, such as the solid-phase extraction of trace priority-listed environmental pollutants. The prepared material shows an excellent permeance to flow when packed as a column to give high enrichment factors, facile regeneration, and excellent reusability for the extraction of the pollutant bisphenol A. It also shows an outstanding performance for the simultaneous enrichment of mixtures of endocrine disrupting chemicals (bisphenol A, 4-tert-octylphenol and 4-n-nonylphenol), facilitating their analysis when present at very low levels (<1 mu gL(-1)) in drinking waters. For the extraction of the pollutant bisphenol A, the prepared ZIF-8@ZnO@PS beads also show a superior extraction and preconcentration capacity to that of the PS beads used as precursors and the composite materials obtained by the direct growth of ZIF-8 on the surface of the PS beads in the absence of metal oxide intermediate coatings.
机译：通过使用包含MOF的金属前体的中间牺牲金属氧化物涂层，可以轻松地制备功能性珠表面上的致密且均匀的金属-有机骨架（MOF）涂层。聚苯乙烯（PS）磁珠涂有ZnO层，得到ZnO @ PS核-壳磁珠。 ZnO @ PS珠在2-甲基咪唑的存在下具有反应性，可将部分ZnO涂层转变成位于内部ZnO前体外壳上方的多孔沸石咪唑酸酯骨架8（ZIF-8）外壳。所获得的ZIF-8 @ ZnO @ PS磁珠可以很容易地以柱形式包装，以用于流通式应用，例如固相萃取痕量优先列出的环境污染物。所制备的材料以柱状包装时表现出出色的通透性，可提供高富集因子，便捷的再生性以及对污染物双酚A的萃取具有出色的可重复使用性。它还显示出出色的性能，可同时富集内分泌干扰物化学品（双酚A，4-叔辛基苯酚和4-正壬基苯酚），当它们在饮用水中的含量极低（<1μgL（-1））时，有助于进行分析。对于萃取双酚A污染物，所制备的ZIF-8 @ ZnO @ PS珠还具有比用作前体和通过直接将ZIF-8直接生长而获得的复合材料的PS珠更好的萃取和预浓缩能力。在没有金属氧化物中间涂层的情况下PS珠的表面。

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