K+-CD-MOFs,a novel metal-organic frameworks,were prepared using green environment and biocompatible γ-cyclodextrin as ligand and potassium,and characterized by transmission electron microscopy,Fourier transform infrared spectroscopy and X ray diffraction.The electrochemical behavior of copper(Ⅱ) 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 optimized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(Ⅱ) 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(Ⅱ) 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.