Journal
TALANTA
Volume 219, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2020.121255
Keywords
Nitrophenol; Electrochemical detection; Covalent organic frameworks; Fe3O4; Synergistic catalysis
Categories
Funding
- Talented program [A279021724]
- Fundamental Research Funds of Northwest AF University [Z111021601]
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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 mu M and low detection limits (LOD) of 0.2361 mu M and 0.6568 mu M, 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.
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