Preparation Of Polypyrrole Composite Electrode Doped With Ionic Liquid And Study On The Process Of Removal Of Heavy Metal Ions

Capacitive deionization?CDI?technology is a new type of technology for processing heavy metal ions.It is attracting attention because of its easy operation and environmental friendliness.The electrode material is the core of CDI technology.This paper focuses on the research of polypyrrole?PPy?composite electrode doped with ionic liquid,and the surface characteristics,electrochemical characteristics and adsorption performance of PPy composite electrode are improved by doping ionic liquid.The details include the following:?1?PPy-_BF4^[BMIM]/CS/CNT and PPy-_BF4^[Emim]/CS/CNT composite electrodes were prepared by chemical oxidation method,and their morphology and electrochemical properties were characterized,and the addition of ionic liquid was discussed The influence of the amount on the performance of PPy composite electrode.The experimental results show that:PPy-_BF4^[BMIM]/CS/CNT and PPy-_BF4^[Emim]/CS/CNT composite electrode microstructure is nanowire network structure,and FT-IR and XPS test results show that CS,PPy and CNT Form composites in the form of chemical bonds.The specific capacitance value of PPy composite electrode increases first and then decreases as n_IL:n_Pyy increases.When n_IL:n_Py=1:1,PPy-_BF4^[BMIM]/CS/CNT and PPy-_BF4^[Emim]/CS/CNT The specific capacitance of the composite electrode reached the maximum value,which were 73.5F/g and 96.16F/g,respectively,and the cycle stability of the two is improved by about 38%compared with the stability of PPy/CS/CNT.?2?The two composite electrodes are used to adsorb Cu2+-containing solution.At the same amount of ionic liquid,the adsorption capacity of PPy-_BF4^[BMIM]/CS/CNT composite electrode can reach 32.0mg/g,The adsorption capacity of PPy-^[EmimBF4]/CS/CNT composite electrode reached 36.81mg/g,which was slightly larger than PPy-_BF4^[BMIM]/CS/CNT composite electrode.?3?The adsorption performance of PPy-_BF4^[BMIM]/CS/CNT composite electrode and PPy-_BF4^[Emim]/CS/CNT composite electrode to different metal ions(Fe³⁺,Ag⁺and Cu2+)showed that:For the three ions of Ag+,Cu2+and Fe3+,the charge of the heavy metal ions to be tested will affect the adsorption capacity of the two composite electrodes.The larger the charge carried by the metal ions to be tested,the greater the corresponding adsorption capacity.