Research And Application Of Cesium Ion Selective Electrode Based On Ion-imprinted Polymer

Three Cesium（Ⅰ）-imprinted polymer were prepared by surface imprinting technique,for the determination of trace cesium ions in complex solution.The cesium ion selective membrane electrode was successfully prepared by using the cesium（Ⅰ）ion imprinted polymer as modifier,PVC as the neutral carrier,2-nitrophenyloctyl ether as the plasticizer,and sodium tetraphenylborate as the lipophilic salt.The electrode preparation condition was optimized,and a detailed study on the performance of the electrode is as follows:（1）The cesium（Ⅰ）ion was used as template,Fe₃O₄@SiO₂ as the substrate,carboxylation chitosan as functional monomer and glutaraldehyde as crosslinking agent.And the cesium ion selective electrode（Cs（Ⅰ）-MIIP/GCE）was prepared by modifying the glassy carbon electrode with Cs（Ⅰ）-MIIP.The linear response range of the electrode was 1.0×10-6?1.0×10-1 M,the Nernstian slope was 0.06020 V/Decade,and the detection limit（DEC）was 3.0×10-7 M.（2）The cesium（Ⅰ）ion was used as template,the magnetized multi-walled carbon nanotubes（MMWCNTs）as the substrate,carboxylation chitosan as functional monomer and glutaraldehyde as crosslinking agent.And the cesium ion selective electrode（MMWCNTs@Cs（Ⅰ）-IIP/GCE）was prepared by modifying the glassy carbon electrode with MMWCNTs@-Cs（Ⅰ）-IIP.The linear response range of the electrode was 1.0×10-7?1.0×10-4 M,the Nernstian slope was 0.05954 V/Decade,and the detection limit（DEC）was 4.0×10-8 M.（3）The cesium（Ⅰ）ion was used as template,SBA-15 as the substrate,chitosan as functional monomer and glutaraldehyde as crosslinking agent.And the cesium ion selective electrode（SBA-15@Cs（Ⅰ）-IIP/GCE）was prepared by modifying the glassy carbon electrode with SBA-15@Cs（Ⅰ）-IIP.The linear response range of the electrode was 1.0×10-6?1.0×10-1 M,the Nernstian slope was 0.05690 V/Decade,and the detection limit（DEC）was 6.0×10-7 M.The ion selective electrode has better selectivity for cesium ions.The cesium concentration in real water sample measured by the ion selective electrode is basically consistent with the ICP-MS measurement result.The results show that the electrochemical sensor has potential application in the detection of trace cesium ions.