Study on the detection of copper ion wastewater by electrical analysis technology
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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