Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Key Laboratory of Chemical Biology, Jiangxi Province, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China.
Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Key Laboratory of Chemical Biology, Jiangxi Province, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China.
J Hazard Mater. 2021 May 5;409:124528. doi: 10.1016/j.jhazmat.2020.124528. Epub 2020 Nov 10.
Covalent-organic frameworks (COFs) are conjugate crystalline polymers with high porosity, controllable pores and structure as well as large specific surface area, showing great potential for electrochemical sensors. Here, a new N,S-rich COF is proposed by direct amine-aldehyde dehydration condensation between 4,4',4''-(1,3,5-triazine-2,4,6-triyl)trianiline (TZT) and benzo [1,2-b:3,4-b':5,6-b'']trithiophene-2,5,8-tricarbaldehyde (BTT). The COF has a hexagonal hcb structure with theoretical pore of 2.2 nm and presents rod-like morphology with many small flakes on its surface. Particularly, there are lots of S and N atoms in COF, which provides abundant adsorption sites for Hg so that it can be used to detect Hg. The proposed Hg sensor has a linear range of 0.54 nM-5.0 μM and a detection limit of 0.18 nM. Besides, using COF as precursor and template, the hollow N,S-doped C@Pd nanorods which possesses many tiny Pd nanoparticles embedded in rods-like hollow structure are obtained. An electrochemical paracetamol sensor is also proposed based on the N,S-doped C@Pd nanorods, showing low detection limit of 11 nM and wide linear range of 33 nM-120 μM. The good results provide an important guidance for the application of COF in electrochemical sensors.
共价有机框架（COFs）是具有高孔隙率、可控孔和结构以及大比表面积的共轭结晶聚合物，在电化学传感器中具有巨大的应用潜力。在这里，通过 4,4',4''-(1,3,5-三嗪-2,4,6-三基)三苯胺（TZT）和苯并[1,2-b:3,4-b':5,6-b'']三噻吩-2,5,8-三醛（BTT）之间的直接胺醛缩合脱水反应，提出了一种新型的富 N、S 的 COF。COF 具有六边形 hcb 结构，理论孔径为 2.2nm，并呈现出棒状形态，表面有许多小薄片。特别是，COF 中含有大量的 S 和 N 原子，为 Hg 的吸附提供了丰富的位点，从而可以用于检测 Hg。所提出的 Hg 传感器的线性范围为 0.54 nM-5.0 μM，检测限为 0.18 nM。此外，以 COF 为前驱体和模板，得到了具有许多微小 Pd 纳米颗粒嵌入棒状中空结构的中空 N、S 掺杂 C@Pd 纳米棒。还基于 N、S 掺杂 C@Pd 纳米棒提出了一种对乙酰氨基酚电化学传感器，其检测限低至 11 nM，线性范围宽达 33 nM-120 μM。这些良好的结果为 COF 在电化学传感器中的应用提供了重要的指导。
