Construction of Two-Dimensional Fluorescent Covalent Organic Framework Nanosheets for the Detection and Removal of Nitrophenols,Analytical Chemistry

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Construction of Two-Dimensional Fluorescent Covalent Organic Framework Nanosheets for the Detection and Removal of Nitrophenols
Analytical Chemistry ( IF 6.7 ) Pub Date : 2022-01-24 , DOI: 10.1021/acs.analchem.1c04406
Jia-Qing Chen ₁ , Qiong-Qing Zheng ₁ , Sai-Jin Xiao ₂ , Li Zhang ₁ , Ru-Ping Liang ₁ , Gangfeng Ouyang ₃ , Jian-Ding Qiu ₁

Affiliation

In this work, we synthesized a two-dimensional fluorescent covalent–organic framework (TFPB–TTA COF) nanosheet by selecting and designing reactive monomers to realize the dual-functional processing of nitrophenols. The staggered benzene ring, triazine structure, and imine bond (C═N) of the TFPB–TTA COF can capture free nitrophenols through hydrogen bonding and conjugation interaction, and then, the photoinduced electron transfer and fluorescence resonance energy transfer (FRET) between the TFPB–TTA COF and nitrophenols affects the fluorescence emission of the TFPB–TTA COF, realizing the fluorescence sensing of nitrophenols. The large K_sv values and the low detection limit suggest that the TFPB–TTA COF can serve as sensitive and selective fluorescence sensors for nitrophenol detection in an aqueous system. At the same time, the strong interaction combined with the porous network structure of the TFPB–TTA COF facilitates the efficient adsorption and removal of nitrophenols. Especially for 2,4,6-trinitrophenol, the maximum adsorption capacity can reach 1045.53 mg/g with good recyclability and high structural stability of the TFPB–TTA COF. This work proposed a simple synthetic method for the construction of a fluorescent COF platform for the sensitive determination and efficient adsorption of nitrophenols.

中文翻译：

构建用于检测和去除硝基酚的二维荧光共价有机骨架纳米片

在这项工作中，我们通过选择和设计反应性单体合成了二维荧光共价有机框架（TFPB-TTA COF）纳米片，以实现对硝基酚的双功能加工。TFPB-TTA COF 交错的苯环、三嗪结构和亚胺键 (C=N) 可以通过氢键和共轭相互作用捕获游离硝基酚，然后，光诱导电子转移和荧光共振能量转移 (FRET) TFPB-TTA COF和硝基苯酚影响TFPB-TTA COF的荧光发射，实现对硝基苯酚的荧光传感。大K _sv值和低检测限表明 TFPB-TTA COF 可以用作水系统中硝基苯酚检测的灵敏和选择性荧光传感器。同时，强相互作用与 TFPB-TTA COF 的多孔网络结构相结合，有利于硝基苯酚的有效吸附和去除。特别是对于2,4,6-三硝基苯酚，TFPB-TTA COF的最大吸附量可达1045.53 mg/g，具有良好的可回收性和较高的结构稳定性。本工作提出了一种简单的合成方法，用于构建荧光 COF 平台，用于灵敏测定和高效吸附硝基苯酚。

更新日期：2022-02-09

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