凯发

Abstract:
Fresh water is a key factor for humankind to sustain life. However, the lack of freshwater and water pollution limit the utilization of freshwater resource. Among various pollutants in the water, excessive salt ions and heavy metal ions become a major concern due to their adverse effects on human health. Capacitive deionization (CDI), as an electro-adsorption water purification technology, has gained increasing attention due to the merits of low cost, low energy consumption, high efficiency, rapid regeneration, and environmental benignity. When applying a low potential on the two electrodes, the ions in solution can be quickly adsorbed and harvested in the oppositely-charged electrodes, and the clean water is obtained. The ion removal capacity of CDI has a close relation with electrode materials. Various of carbon materials (such as graphene) have been extensively explored as CDI electrode materials due to the advantages of porous structure, high surface area, and electrochemical stability. However, the limited ion removal ability of these carbon materials makes it difficult to expand their practical applications. Based on the above research situation and drawbacks, we novelly designed and prepared some modified carbon-based composites, investigated their capacitive deionization performance, and verified ion removal mechanisms.