Construction of COF@MOF composite-based electrochemical sensor for rapid detection of 2-Aminophenol

2-Aminophenol (2-AP) is an organic compound with antibacterial and antioxidant properties in cosmetics, detergents, dyes, and pharmaceuticals. In particular, human health and the environment can be significantly threatened when the concentration of phenolic substances in water reaches 0.1005 mg/L. Hence, there is an urgent need to develop a prompt and accurate analyzing method of 2-AP. To this end, Cu-MOF material was employed as a substrate, and its conductivity and catalytic properties were then enhanced by incorporating Tp-BD-DBd COF within the pores. This COF@MOF composite incorporation, named Tp-COF@Cu-BDC, introduced not only extensive π-conjugated systems but also the mutual electron-donating amino and carboxylate electron-withdrawing groups that may help improve the adsorption capability of 2-AP. Consequently, an increase in conductivity of the Tp-COF@Cu-BDC composite was achieved compared with the MOF monomer. At the same time, the fabricated sensor exhibited a broad detection range (2–250 μM), a low detection limit (0.597 μM), remarkable anti-interference capabilities, and a high recovery rate for 2-AP. Furthermore, the recovery experiment results have proved the actual samples' detection capability based on our electrochemical sensor. Thus, it can be inferred that the COF@MOF composite-based electrochemical sensor is a highly effective platform for detecting 2-AP in environmental settings.