分层电沉积制备聚吡咯/壳聚糖/氧化石墨烯复合电极及其在CDI技术中的应用

Preparation of polypyrrole/chitosan/graphene oxide composite electrode by layered electrodeposition and its application in CDI technology

采用电化学沉积法成功制备了聚吡咯/壳聚糖/氧化石墨烯(PPy/CS/GO)复合材料,并将其用于CDI技术处理重金属废水。从SEM、FT-IR和XPS可以看出,PPy/CS/GO复合材料具有三明治结构,PPy和CS呈球形并被GO片层包裹,三者之间以化学键相互结合。对PPy/CS/GO复合材料的电化学特性与吸脱附性能进行了测试和分析。结果表明,与PPy电极相比,PPy/CS/GO复合电极具有更高的电容(165.03 F/g)和更低的电荷转移电阻(1.959Ω)。PPy/CS/GO复合电极的吸附容量为35.53 mg/g,约为PPy电极的2.03倍(17.46 mg/g)。在多次吸附/脱附过程中,无明显的吸附量下降。CS和GO的加入,极大的提高了PPy的CDI性能。因此,PPy/CS/GO复合材料作为电容去离子技术的高性能电极材料,具有很大的发展潜力。

Polypyrrole/chitosan/graphene oxide(PPy/CS/GO)composites were successfully prepared by electrochemical deposition and used to removing heavy metal ions from wastewaterfor CDI technology.It could be seen from SEM,FT-IR and XPS that the PPy/CS/GO composite had a sandwich structure.PPy and CS were spherical and wrapped by GO sheets.The three were combined with each other by chemical bonds.The electrochemical characteristics and adsorption/desorption properties of PPy/CS/GO composites were tested and analyzed.The results show that compared with PPy electrodes,PPy/CS/GO composite electrodes had higher capacitance(165.03 F/g)and lower charge transfer resistance(1.959Ω).The adsorption capacity of the PPy/CS/GO composite electrode was 35.53 mg/g,which was about 2.03 times of that of PPy electrode(17.46 mg/g).During the multiple adsorption/desorption processes,there was no significant decrease in the amount of adsorption.The addition of CS and GO had greatly improved the CDI performance of PPy.Therefore,PPy/CS/GO composite materials had great potential for development as high-performance electrode materials for capacitive deionization technology.