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首页> 外文期刊>RSC Advances >Rapid and selective adsorption of a typical aromatic organophosphorus flame retardant on MIL-101-based metal–organic frameworks
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Rapid and selective adsorption of a typical aromatic organophosphorus flame retardant on MIL-101-based metal–organic frameworks

机译：在MIL-101的金属有机框架上快速和选择性地吸附典型的芳香有机磷阻燃剂

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The pollution of aromatic organophosphorus flame retardants (aromatic OPFRs) in aquatic environments has drawn great attention over the last few years. Two MIL-101-based metal–organic frameworks (Cr-MIL-101 and Fe-MIL-101-NH _(2) ) which possess ordered mesoporous cavities (2.9 and 3.4 nm) and aromatic structures were chosen and prepared to selectively adsorb a typical aromatic OPFR [triphenyl phosphate (TPhP)] from aqueous solution. Pore distribution analysis showed that Cr-MIL-101 and Fe-MIL-101-NH _(2) had both a mesoporous structure (2–3.5 nm) and microporous structure (1–2 nm), conducive to diffusion and adsorption of TPhP molecules. Compared with Fe-MIL-101-NH _(2) as well as commercial activated carbon, Cr-MIL-101 showed rapid and efficient adsorption for TPhP, and its initial sorption velocity ( v _(0) ) calculated from the pseudo-second-order model was up to 568.18 μmol g ~(?1) h ~(?1) . The adsorption equilibrium of TPhP on the Cr-MIL-101 was almost achieved within 12 h, while the equilibrium time of other adsorbents required more than 48 h. The study of selective adsorption found that Cr-MIL-101 had a higher sorption amount for aromatic OPFRs than alkyl-OPFRs and other aromatic compounds with different chemical structures. Cr-MIL-101 was able to keep a steady selective adsorption for TPhP in the presence of co-existing aromatic compounds. Based on the analysis of K _(ow) , molecular structure and further density functional theory calculations, hydrophobic interactions may play a dominant role in the selective adsorption process of TPhP, and π–π interactions may be also involved. Cr-MIL-101 exhibits reusability and promising potential to rapidly and selectively remove aromatic OPFR in environmental remediation.
机译：在过去几年中，水生环境中芳香有机磷阻燃剂（芳香OPFRS）的污染引起了很大的关注。选择具有有序介孔腔（2.9和3.4nm）和芳族结构的两个MIL-101的金属 - 有机框架（CR-MIL-101和Fe-MIL-101-NH _（2））并制备选择性吸附来自水溶液的典型芳族OPFR [三苯基磷酸（TPHP）]。孔分布分析表明，Cr-MIL-101和Fe-MIL-101-NH _（2）具有介孔结构（2-3.5nm）和微孔结构（1-2nm），有利于TPHP的扩散和吸附分子。与Fe-MIL-101-NH _（2）以及商业活性炭相比，CR-MIL-101显示出对TPHP的快速有效的吸附，其初始吸附速度（V _（0））从伪计算计算二阶模型高达568.18μmolg〜（？1）h〜（？1）。在12小时内，CR-MIL-101上的TPHP的吸附平衡几乎达到，而其他吸附剂的平衡时间需要超过48小时。选择性吸附的研究发现Cr-MIL-101对芳族OPFRS的吸附量高于烷基-POMFRS和具有不同化学结构的其他芳族化合物。 CR-MIL-101能够在共存芳族化合物存在下保持TPHP的稳定选择性吸附。基于K _（OW）的分析，分子结构和进一步的密度官能理论计算，疏水相互作用可能在TPHP的选择性吸附过程中发挥显着作用，并且也可以涉及π-π相互作用。 CR-MIL-101表现出可重用性和有希望的潜力，以快速，选择性地除去环境修复中的芳香opfr。

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