微囊藻毒素类似物差异吸附的共价有机骨架孔功能选择,ACS Applied Materials & Interfaces

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微囊藻毒素类似物差异吸附的共价有机骨架孔功能选择
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-03-24 , DOI: 10.1021/acsami.0c18808
Soraia P S Fernandes _{1,

2} , Petr Kovář ₃ , Milan Pšenička ₃ , Artur M S Silva ₂ , Laura M Salonen ₁ , Begoña Espiña ₁

Affiliation

微囊藻属（Microcystis sp。）生产的微囊藻毒素（MCs）是淡水中最常见的氰毒素，由于其毒性，全球分布和在水中的持久性，有必要改进其早期检测和从水中去除的监测程序。为此，我们研究了三种共价有机框架（COF），TpBD-（CF ₃）₂，TpBD-（NO ₂）₂和TpBD-（NH ₂）_{2的性能。}用于从水中吸附最常见和/或有毒的MC衍生物MC-LR，MC-RR，MC-LA和MC-YR。尽管可以使用所有三种COF衍生物有效吸附MC-LR和MC-YR，但发现对最具亲脂性的毒素MC-LA和TpBD-（NH ₂）₂以及对亲水性最高的MC-MC-，都具有很高的吸附效率。具有TpBD-（NO ₂）的RR 。理论计算表明，MC-LA和MC-RR倾向于主要位于COF表面，通过氢键与TpBD-（NH ₂）₂和TpBD-（NO ₂）₂的氨基和硝基官能团相互作用，分别。TpBD-（NO ₂）₂胜过报道的捕获MC-RR的吸附材料，导致最大吸附容量增加了一个数量级。TpBD-（NH ₂）₂据报道，它是捕获MC-LA的第一种有效吸附材料。观察到具有不同COF的MC的解吸效率差异很大，这突出表明了COF-吸附物相互作用在物质回收中的重要性。在这里，我们表明，水这些毒素的有效捕获可以通过COF材料的正确选择来实现。更重要的是，这项研究表明，通过仔细选择COF功能，可以将特定的化合物作为目标或排除在一组类似物中，从而为设计更有效和更具选择性的吸附材料提供了见识。

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Selection of Covalent Organic Framework Pore Functionalities for Differential Adsorption of Microcystin Toxin Analogues

Microcystins (MCs), produced by Microcystis sp, are the most commonly detected cyanotoxins in freshwater, and due to their toxicity, worldwide distribution, and persistence in water, an improvement in the monitoring programs for their early detection and removal from water is necessary. To this end, we investigate the performance of three covalent organic frameworks (COFs), TpBD-(CF₃)₂, TpBD-(NO₂)₂, and TpBD-(NH₂)₂, for the adsorption of the most common and/or toxic MC derivatives, MC-LR, MC-RR, MC-LA, and MC-YR, from water. While MC-LR and MC-YR can be efficiently adsorbed using all three COF derivatives, high adsorption efficiencies were found for the most lipophilic toxin, MC-LA, with TpBD-(NH₂)₂, and the most hydrophilic one, MC-RR, with TpBD-(NO₂). Theoretical calculations revealed that MC-LA and MC-RR have a tendency to be located mainly on the COF surface, interacting through hydrogen bonds with the amino and nitro functional groups of TpBD-(NH₂)₂ and TpBD-(NO₂)₂, respectively. TpBD-(NO₂)₂ outperforms the adsorbent materials reported for the capture of MC-RR, resulting in an increase in the maximum adsorption capacity by one order of magnitude. TpBD-(NH₂)₂ is reported as the first efficient adsorbent material for the capture of MC-LA. Large differences in desorption efficiencies were observed for the MCs with different COFs, highlighting the importance of COF–adsorbate interactions in the material recovery. Herein we show that efficient capture of these toxins from water can be achieved through the proper selection of the COF material. More importantly, this study demonstrates that by careful choice of COF functionalities, specific compounds can be targeted or excluded from a group of analogues, providing insight into the design of more efficient and selective adsorbent materials.

更新日期：2021-04-08

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