Electrochemical Behavior and Determination of Copper (¢ò) Based on Metal-Organic Frameworks Prepared with ¦Ã-Cyclodextrin Ligand

KeyWord:cyclodextrin  metal-organic frameworks  cyclic voltammetry  differential pulse voltammetry  copper

Abstract:

      K+-CD-MOFs,a novel metal-organic frameworks,were prepared using green environment and biocompatible ¦Ã-cyclodextrin as ligand and potassium,and characterized by transmission electron microscopy,Fourier transform infrared spectroscopy and X ray diffraction.The electrochemical behavior of copper(¢ò) was investigated on a glassy carbon electrode modified with K+-CD-MOFs by cyclic voltammetry and differential pulse voltammetry,and various experimental factors including kind of buffer,pH value and scan rate,were optimizedª±Under the conditions of pH 5.0 acetic acid buffer,scan range of-0.4-0.4 V and scan rate of 0.1 V/s,the peak currents varied linearly with the concentration of copper(¢ò) in the range of 0.1-91.7 mg/L,and the detection limit(S/N=3) was 0.018 mg/L.The results indicated that this original material exhibited good electrochemical activities.The effects of other co-existing cations including Ca2+,Zn2+,Mg2+,Pb2+,Cd2+ and Hg2+ were also studied on K+-CD-MOFs modified glassy carbon electrode,which showed that the obtained MOF had a high selectivity to copper ion,and the peak current can not be interfered significantly except for Hg2+.The electrochemical method displayed the advantages of high sensitivity,reproducibility,stability and certain anti-ions interference ability,and could be used to detect rapidly and exactly the copper(¢ò) in industrial waste water samples. It is also showed that the novel metal-organic frameworks fabricated electrochemical sensor has a huge potential in determination of heavy metals.