A Facile One-Pot Synthetic Approach Towards CB@PCN-222(Fe) Composites for Simultaneous Electrochemical Detection of Dihydroxybenzene Isomers

A novel porphyrin-metal organic frameworks (MOFs) based hybrid composite was created by combining conductive carbon black (CB) and PCN-222(Fe) (PCN = porous coordination network) via a one-pot strategy. The proposed material unquestionably takes advantage of the high specific area from MOFs and the strong conductivity of CB, which contributes to the contact with analytes and detection sensitivity. A series of analyses showed that the proposed modified electrode could be an alternative candidate for electrochemical detection of dihydroxybenzene isomers. A good linear correlation occurred between the differential pulse voltammetry current and the concentration of hydroquinone (HQ), catechol (CC) and resorcinol (RC) under the optimized conditions. With low detection limits (0.122, 0.094 and 0.243 μM) at the ranges (0.5-280, 0.5-280 and 0.5-320 μM) of these isomers mentioned above, the sensor exhibited good cost-effectiveness, repeatability and stability. Our methodology drives us to directly analyze the dihydroxybenzene isomers in actual samples with dependable recovery, further broadening the electrochemical detection field for environmental pollutants based on porphyrin MOFs.