离子液体复合氮化碳用于检测Fe2+/Fe3+

Electrochemical Probe Made of Ionic Liquid Composite Carbon Nitride for Detection of Fe2+/Fe3+

为避免日常生活中人体摄入过量的三价铁离子,研究一种对环境水、饮用水中铁离子不同价态的识别和检测方法具有重要的现实意义.以双氰胺为原料,利用热缩聚法制备了类石墨氮化碳(g-C3N4),再将1-丁基-3-甲基咪唑六氟磷酸盐([BMIM] PF6)与氮化碳(g-C3N4)进行溶剂热处理制成[BMIM] PF6/g-C3 N4复合物.采用X射线衍射、红外光谱、扫描电镜等方法对其进行表征.利用三电极系统和电化学工作站i-t模式的电镀方法,制备用于检测Fe2+、Fe3+的电化学探针[BMIM] PF6/g-C3N4/ITO.通过循环伏安法、差分脉冲溶出伏安法研究了Fe2+、Fe3+在该电极上的电化学行为,即首次将电化学探针用于检测同一离子的不同价态研究.研究结果表明该电化学探针可以准确识别电解液中Fe2+与Fe3+的共存,并能在两者共存时实现对Fe2+和Fe3+的定量检测.

In order to avoid excessive intake of trivalent iron ions in daily life,it is of great practical significance to develop a method to identify and detect different valence states of iron ions in environmental water and drinking water.In this study,graphitic carbon nitride(g-C3N4)was synthesized by thermal condensation with dicyandiamide,and then 1-butyl-3-methylimidazole hexafluorate phosphate([BMIM]PF6)and carbon nitride(g-C3N4)were mixed with solvent heat treatment to synthesize[BMIM]PF6/g-C3N4 compound.It was characterized by X-ray diffraction,infrared spectroscopy and scanning electron microscopy.The[BMIM]PF6/g-C3N4 compound was then dispersed in a small amount of deionized water and sonicated.The electrochemical probe[BMIM]PF6/g-C3N4/ITO for detecting Fe2+and Fe3+was prepared by using a three-electrode system and an electroplating method in i-t mode of an electrochemical workstation.The electrochemical behavior of Fe2+and Fe3+on the electrode was studied by cyclic voltammetry and differential pulse stripping voltammetry.The electrochemical probe was used to detect different valence states of the same ion for the first time.The research results show that the electrode is able to identify accurately the coexistence of Fe2+and Fe3+in the electrolyte,and detect quantitatively Fe2+and Fe3+when the two coexist.