Preparation Of ?-cyclodextrin-K Metal Organic Framework And Its Composite Materials In The Application Of Electrochemical Sensor

With people's pursuit of quality of life generally rising,which need to develop a large number of resources,so industry has been rapid development,but in the process,environment pollution can not be avoided.Such as heavy metal ion emissions,organic synthetic dyes or pigments used in daily necessities or food.If there is no limit,once excessive,will cause a certain degree of harm to organisms.So far,some highly precise methods have been used to quantitatively detect heavy metal ions and organic pollutants,such as Inductively coupled plasma spectroscopy and mass spectrometry(ICP-MS),Atomic absorption spectrometry(AAS),Ultraviolet-visible spectroscopy(UV-VIS),Fluorescence spectroscopy,Roman spectroscopy,High performance liquid chromatography(HPLC).However,these methods usually require expensive equipment,specially trained operators,tedious samples preparation or poor detection limits.In contrast,electrochemical detection methods have attracted wide attention as a promising method for the determination of electrochemical active substances due to its many advantages,including fast response,simple operation,high sensitivity,high time efficiency,easy monitoring and relatively low production costs.Hence,developing a sensor with higher electrocatalytic activity has important practical significance.The Organic Metal Framework can significantly improve the electrocatalytic ability of the sensor due to its regular pore structure and high internal specific surface area.In this paper,based on alkali?-cyclodextrin metal organic framework(?-CD-MOF1),two composite sensors were fabricated and applied to the analysis of copper ion,Rhodamine B and sunset yellow,respectively,and showed favorable analytical performance.In chapter ?,Reduced graphite oxide(rGO)was composed with?-CD-MOF1 to modify the carbon paste electrode and was used for selective analysis of Cu²⁺.It was making use of the spongy structure of MOFs and the high conductivity of rGO.The electrochemical behaviors of Cu²⁺on the?-CD-MOF1-rGO/CPE were explored by square wave anodic stripping voltammetry(SWASV).Significant impacts like electrolyte pH,deposition potential and deposition time were investigated and optimized to determinate the trace of Cu²⁺.Under the optimum conditions,the established sensor had two-stage linear rang of 0.4-10 nM and 10-6000 nM.The limit of detection(LODs)is 0.12 nM.In river water samples,this method showed favorable stability and potential practical applicability,and consistent with ICP-MS analysis.The third chapter uses multi-walled carbon nanotubes(MWCNTs)composite with?-CD-MOF1 modified glassy carbon electrodes for simultaneous determination of rhodamine B(RB)and sunset yellow(SY).Differential pulse voltammetry(DPV)was used to study the electrochemical performance of the as-prepared sensor.Owing to the synergistic effect of?-CD-MOF1 and MWCNTs,the composite electrode showed good electrocatalytic activity and enhanced electrochemical signal for Rhodamine B and sunset yellow.Under the optimized conditions,in the mixed solution of Rhodamine B and sunset yellow,the linear response range of Rhodamine B is 4.0?M-100?M,the linear response range of sunset yellow is 2.0?M-200?M and 200?M-600?M.The detection limit of Rhodamine B alone is 2.6?M,and the detection limit of sunset yellow is 0.2?M.At the same time,the composite electrode has good reproducibility and anti-interference ability,and has been successfully applied to the detection of Rhodamine B and sunset yellow in real samples.