Microchimica Acta ( IF 5.3 ) Pub Date : 2021-08-11 , DOI: 10.1007/s00604-021-04956-1 Fei Pan 1, 2, 3 , Chunyi Tong 4 , Zhaoyang Wang 3 , Haitao Han 1 , Pei Liu 5 , Dawei Pan 1 , Rilong Zhu 3
|
An electrochemical sensor constructed by intercalated composites was developed for determination of heavy metal ions. The intercalated composites were composed of hydrosulphonyl functional covalent organic frameworks (COF-SH) and graphene (G). The presence of numerous adsorption sites, such as 18 sulfur atoms and 30 nitrogen atoms per big circle of COFs on COF-SH, was beneficial for the accumulation of heavy metals, while the graphene enhanced the electrical conductivity. The obtained sensor under the optimal conditions successfully detected the presence of heavy metal ions in coastal water samples at concentrations ranging from 1 to 1000 μg L−1. The detection limits of Cd (II), Pb (II), Cu (II), and Hg (II) were 0.3, 0.2, 0.2, and 1.1 μg L−1, respectively. Furthermore, the sensor still exhibited good stability after multiple uses less than 5%. When it is used in the analysis of actual samples, the recovery of standard addition is higher than 95%. In sum, the combination of hydrosulphonyl functional COFs with graphene looks very promising for the assembly of sensors with high sensitivity toward the determination of heavy metal ions for coastal environmental monitoring.
Graphical abstract
中文翻译：
基于石墨烯和带有氢磺酰基的插层共价有机骨架的纳米复合材料用于重金属离子的电化学测定
开发了一种由插层复合材料构成的电化学传感器，用于测定重金属离子。插层复合材料由氢磺酰基功能共价有机骨架（COF-SH）和石墨烯（G）组成。COF-SH上每个COFs的大圈有18个硫原子和30个氮原子等众多吸附位点的存在，有利于重金属的积累，而石墨烯则增强了导电性。在最佳条件下获得的传感器成功检测到沿海水样中重金属离子的存在，浓度范围为 1 至 1000 μg L -1。Cd (II)、Pb (II)、Cu (II) 和 Hg (II) 的检测限分别为 0.3、0.2、0.2 和 1.1 μg L -1， 分别。此外，传感器在多次使用后仍表现出良好的稳定性，低于 5%。用于实际样品分析时，加标回收率高于95%。总之，氢磺酰基功能性 COF 与石墨烯的组合对于组装具有高灵敏度的传感器来说非常有希望，该传感器对测定沿海环境监测的重金属离子具有高灵敏度。
京公网安备 11010802027423号