Simultaneous determination of 4-aminophenol and acetaminophen based on high electrochemical performance of ZIF-67/MWCNT-COOH/Nafion composite

Herein, a novel electrochemical sensor based on ZIF-67/MWCNT-COOH/Nafion composite was designed and prepared for simultaneous detection of 4-aminophenol (4-AP) and acetaminophen (AMP). The electrochemical behaviors of the 4-AP and AMP on the ZIF-67/MWCNT-COOH/Nafion electrode were explored via cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results exhibited that the designed electrochemical sensor possessed superior electrocatalytic activity for 4-AP and AMP, which was attributed to the highly ordered porous structure of ZIF-67, the outstanding electrical conductivity and high electrocatalytic activity of MWCNT-COOH. Under optimization conditions, the DPV response of the prepared electrode depicted a wider linear response concentration range of 0.2 to 200 mu M for 4-AP, and 0.1 to 100 mu M for AMP, respectively. And the lower detection limits (LOD) of 0.01 and 0.07 mu M were obtained for 4-AP and AMP, respectively. More importantly, the acquired electrode was applied to Yellow river water and Paracetamol tablets for analysis of 4-AP and AMP, which exhibited satisfying recovery of 98.2% similar to 106.7% for 4-AP and 94.7% similar to 99.6% for AMP, respectively. In a word, the constructed electrochemical sensing platform delivered a promising potential in real application.