Preparation Of Metal(Cu,Ti)-Organic Frameworks Based Composites And Applications In Electrochemical Sensing

Metal-organic frameworks(MOFs)is a new kind of porous material formed by self-assembly of metal ions or clusters and organic ligands through coordination bonds.MOFs has both the structural characteristics of rigid inorganic material and flexible organic material,and has received extensive attention since its emergence.However,the poor conductivity and water stability of MOFs materials limit their applications in the field of electrochemistry.The research of MOFs composites provides a new strategy for the preparation of high performance materials to expand the application of MOFs.In this paper,CuTCPP/platelet ordered mesoporous carbon(pOMC)composites and MIL-125/polypyrrole(PPy)composites were synthesized by using pOMC and PPy as matrixes,and the composites were characterized by a series of methods.Hydroxylamine and chlorogenic acid were used as probes to evaluate the electrocatalytic performance of CuTCPP/pOMC composites by electrochemical method.Nitrofurantoin(NFT)was selected as probe to molecule explore the influence of the synthesis method of MIL-125/PPy composites on electrocatalytic performance.The specific work of the paper is as follows:1.2D porphyrin-based MOF/platelet ordered mesoporous carbon composites(CuTCPP/pOMC)were successfully synthesized by conventional solvothermal reaction.The introduction of pOMC increases conductivity of CuTCPP/pOMC composites,weakens accumulation of the CuTCPP layers,and exposes more active sites of CuTCPP.CuTCPP/pOMC composites show high electro-catalytic activity to the oxidation of hydroxylamine and the redox of chlorogenic acid.The electrochemical sensor based on CuTCPP/pOMC was constructed for quantitative determination of hydroxylamine and chlorogenic acid,and relevant mechanisms were discussed.The sensor displays wide linear responses and rapid response time for hydroxylamine,and presents low limit of detection(LOD)and the highest sensitivity in non-noble metal sensors.The sensor was used to detect hydroxylamine and chlorogenic acid in real samples,and satisfactory results were obtained.The work is now published in Analytica Chimica Acta.2.Ti-based MOF and polypyrrole composites were fabricated by ultrasound-assisted(denoted as MIL-125/PPy-U)and solvent thermal method(denoted as MIL-125/PPy-S),respectively.Basic characterizations reveal that the electro-catalytic activity of MIL-125/PPy composites can be influenced by the synthetic methods.Due to higher conductivity and BET surface area,MIL-125/PPy-U shows better electro-catalytic activity toward the reduction of NFT than that of MIL-125/PPy-S.The electrochemical sensor based on MIL-125/PPy-U was constructed,which exhibited wide linear response ranges and low over-potential to NFT.In addition,MIL-125/PPy-U sensor enables the detection of NFT in human serum and urine...