Research On MG@ZIFs-based Bisphenol A Molecularly Imprinted Electrochemical Sensors

This topic first uses magnetic graphene composite material(MG@ZnO)as a carrier and ZnO as a metal source to grow and synthesize a magnetic graphene-based ZIF composite film(MG@ZIF-n)in situ.The functionalized graphene molecularly imprinted composite membrane(MG@ZIFn-MIP)was prepared by surface molecular imprinting technology.According to the highly specific recognition function of molecularly imprinted polymers(MIPs)for target molecules,combined with electrochemical transfer Sensing technology realizes highly sensitive detection of bisphenol A in water environment.(1)The magnetic graphene material(MG)was prepared by the hydrothermal reduction method,and ZnO was loaded on the surface of the magnetic graphene composite material to synthesize the magnetic graphene composite material(MG@ZnO).Then dimethylimidazole and benzimidazole were used as the etchant and reaction solvent respectively,and the ZnO on the surface of MG@ZnO was grown in situ into ZIF-8 and ZIF-7 to obtain MG@ZIF-8 and MG@ZIF-7 Two kinds of magnetic graphene-based ZIF composite films.The results show that the Fe₃O₄microspheres on the surface of MG@ZnO are about 300nm,and the ZnO nanoparticles are uniformly distributed about 20nm;ZIF-8 and ZIF-7 were grown in situ with ZnO as the nucleus.(2)Using MG@ZnO,MG@ZIF-8 and MG@ZIF-7 as carriers,and bisphenol A as the target molecule,surface molecular imprinting technology was used to synthesize MG@ZnO-MIP,MG@ZIF8-MIP,MG@ZIF7-MIP Three functional graphene molecularly imprinted composite membranes.Then choose MG@ZnO-MIP,MG@ZIF8-MIP,MG@ZIF7-MIP three functional graphene molecularly imprinted composite membranes as sensitive materials to construct the corresponding bisphenol A electrochemical sensor.The research results show that the electrochemical performance of MG@ZIF8-MIP is better than that of MG@ZnO-MIP and MG@ZIF7-MIP.The detection potential of the target molecule bisphenol A is-0.5V and the sensing response time is 3 min.There is a good linear relationship in the concentration range of 0.0001?0.005?M bisphenol A,and the ultrasensitive detection limit is 0.61 ng/L.