It is of great significance to detect the content of Cu(Ⅱ)ion in industrial wastewater due to the serious threat of Cu(Ⅱ)ion to the environment and human health.Metal-organic Frameworks(MOFs),featuring large specific surface area,ample adsorptive sites and high designability,have received extensive attention as a new kind of porous crystalline materials.The Ni-MOF was prepared by solvothermal method and used as modification material on the naked glassy carbon electrode.The electrochemical properties of Ni-MOF modified electrode were characterized by CV method and EIS method.The results showed a decreased electrical conductivity for Ni-MOF modified electrode,indicating a successful loading of low conductive Ni-MOF on the surface of the glassy carbon electrode.The experimental optimization of stripping voltammetry for Cu(Ⅱ)ion with Ni-MOF modified electrode were carried out.The experimental conditions were optimized by using acetic acid-sodium acetate buffer solution as the supporting electrolyte at pH=5 with a enrichment potential-1.2 V for 130 s.When the Ni-MOF modified electrode was used for Cu(Ⅱ)ion detection,a linear relation-ship between the peak current and Cu(Ⅱ)ion concentration was obtained to be I(μA)=2.8+1.89C(μM)with sensitivity of 1.89 μA·μM-1 and the linear correlation coefficient R2 of 0.997.The good performance in the five repeated detection cycles of Cu(Ⅱ)ion indicated a good reproducibility of Ni-MOF modified electrode in Cu(Ⅱ)ion detection.
metal-organic frameworksmodified electrodeheavy metal ionselectrochemical detec-tionstripping voltammetry
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