Surface morphology-controllable magnetic covalent organic frameworks: A novel electrocatalyst for simultaneously high-performance detection of p-nitrophenol and o-nitrophenol

• Published in: Talanta (Oxford) Vol. 219; p. 121255
• Main Authors: Wang, Qinzhi, Li, Rui, Zhao, Yijian, Zhe, Taotao, Bu, Tong, Liu, Yingnan, Sun, Xinyu, Hu, Huifan, Zhang, Meng, Zheng, Xiaohan, Wang, Li
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2020
• Subjects: Covalent organic frameworks; Electrochemical detection; Fe3O4; Nitrophenol; Synergistic catalysis; Covalent organic frameworks; Fe3O4; Synergistic catalysis; Electrochemical detection; Nitrophenol
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2020.121255

Covalent organic frameworks (COFs) have attracted tremendous interest due to their promising applications, including electrocatalysis originating from their unique structural features. However, it remains a challenge to prepare COFs for p-nitrophenol (PNP) and o-nitrophenol (ONP) electrocatalysis because it is quite difficult to manipulate their dimension, composition, and morphology with abundant active sites. Here, a facile ambient temperature synthesis of unique Fe3O4-based magnetic COFs nanosphere (Fe3O4@AT-COFs) with different surface morphologic structure is reported, which exhibits higher surface area, good water dispersity, long-term stability, excellent electrical conductivity and pre-concentration effect. The prepared Fe3O4@AT-COF-based electrochemical sensor is then directly employed for the simultaneous detection of PNP and ONP with a wide linear detection range of 10–3000 μM and low detection limits (LOD) of 0.2361 μM and 0.6568 μM, respectively. Meanwhile, the Fe3O4@AT-COF can be also well-applied in lake and tap water for monitoring PNP and ONP with outstanding sensitivity and reliability, which is expect to be a high-efficient electrocatalyst with great promise for signal amplification of electrochemical sensing. [Display omitted] •Facile synthesis of Fe3O4-based magnetic COFs with different surface morphologic structure.•COFs as the enrichment carriers of Fe3O4 were employed for amplifying electrochemical sensing signals.•Fe3O4 plays a dual role in magnetic attraction with the electrode and synergistic catalysis effect with COFs.•A sensitive and reliable simultaneously detection of PNP and ONP were achieved with a low limit of detection.