Research And Application Of Carbon Nanomaterial-based Detection Of Small Molecular Substances

Aim:Electrochemical sensors prepared using composites based on carbon nanomaterials are used to detect small molecular substances bisphenol A（BPA）and acetaminophen（APAP）in urine and tap water,providing a sensitive and rapid,efficient and low-cost detection methods.Methods:Firstly,the composite prepared by simple physical mixing of carbon nanomaterial carbon black（CB）and surfactant cetyltrimethylammonium bromide（CTAB）was drop-cast on glassy carbon electrode（GCE）as the first working electrode（CB/CTAB/GCE）,likewise,another composite of carbon nanomaterial,carbon nanotubes（CNTs）and the hydrothermally synthesized inert material molybdenum disulfide（Mo S₂）was drop-cast on the GCE as the second working electrode（CNTs/Mo S₂/GCE）.Secondly,the three-electrode system of the electrochemical workstation was used in the work.The methods of cyclic voltammetry（CV）and phase difference pulse voltammetry（DPV）were used to detect BPA and APAP respectively,and to explore the performance of different working electrodes.Results:The linear range of the CB/CTAB/GCE sensor was 0.04 to 0.99μM with a detection limit of 0.013μM.The linear range of the CNTs/Mo S₂/GCE sensor is 0.07 to 10μM and 10 to 150μM,and the detection limit is 0.43μM.The two electrochemical sensors showed good reproducibility and selectivity and were successfully used to detect BPA and APAP in real samples such as tap water and urine,respectively.Conclusion:CB/CTAB/GCE and CNTs/MoS₂/GCE sensors have the advantages of high selectivity,good stability,and good reproducibility.The CB/CTAB/GCE sensor can be successfully used to detect BPA in real samples such as tap water and human urine.The CNTs/Mo S₂/GCE sensor can be successfully applied to the detection of paracetamol in commercial tablets,tap water and urine.