以玻碳电极为基底电极、循环伏安法电聚合聚苯胺(PANI)为固态接触层、合成的壳聚糖-蒙脱石复合材料为离子载体、聚氯乙烯(PVC)为敏感基膜,制备了一个新型全固态磷酸氢根离子选择性电极,并考察了该电极的电化学性能;利用SEM和XRD研究了蒙脱石、壳聚糖和壳聚糖-蒙脱石的表观形貌与结构。结果表明,PANI固态接触层增强了离子选择性膜和电子导体间的离子-电子导电能力,提高了电极的稳定性。该电极在1×10^-1~1×10^-6 mol/L的磷酸氢二钠溶液中呈现良好的能斯特响应,响应斜率为33.09 mV/dec,响应时间在50 s以内,具有优异的重现性和抗干扰能力,电极使用寿命超过2个月。

A novel all-solid-state hydrogen phosphate ion-selective electrode is prepared with glassy carbon electrode as the base electrode,cyclic voltammetry electropolymerized polyaniline (PANI) as the solid contact layer,synthetic chitosan-montmorillonite composite as ionophore,and polyvinyl chloride (PVC) as the sensitive substrate membrane.The electrochemical performance of the electrode is investigated,and the apparent morphology and structure of montmorillonite,chitosan and chitosan-montmorillonite are studied by means of SEM and XRD.It is show by results that PANI solid-state contact layer enhances the ion-electron conductivity between the ion-selective membrane and the electronic conductor,and improves the stability of the electrode.The electrode presents a good Nernst response in the disodium hydrogen phosphate solution in the range of 1×10^-1-1×10^-6 mol·L^-1,the response slope is 33.09 mV·dec^-1,and the response time is within 50 s.It has excellent reproducibility and anti-interference ability,and its service life exceeds 2 months.

刘畅(1998-),男,硕士生,研究方向为电化学传感器,2090073982@qq.com