Speaker
Description
Capacitive deionization (CDI) is a promising technology for electro-chemical deionization of ionic species that is based on the electrical po-tential applied to a pair of electrodes for removing charged ions from an aqueous solution. The electrochemical performance of CDI is highly dependent on the electrode materials used, and carbon-based nanocom-posites have received immense attention because of their high specific surface area, excellent electrical conductivity, good hydrophilicity, and superior electrochemical stability. Since MXene is a promising elec-trode material for energy storage and capacitive deionization (CDI) ap-plications, several MXene-based nanocomposites including MoS2@MXene, activated biochar (AB)@MXene, and MOF@MXene have been fabricated in this study to serve as the electrode materials for symmetric and asymmetric CDI applications. Results show that all the nanomaterials can be successfully well-deposited onto the 2-D MXene surface, which can not only increase the active sites of the composites, but can also increase the specific surface area to higher than 1200 m2/g. The specific electrosorption capacities (SECs) of the MXene nanocom-posites are in the range of 39 – 48 mg/g with charge efficiency of > 85%. Additionally, the as-developed MXene nanosheet has an excellent selective adsorption capacity toward heavy metal and ammonium ions removal. The Ti3C2 Mxene can selectively electroadsorb NH4+ with the SEC of 39.7 mg/g. These results clearly demonstrate the superiority of the as-developed MXene nanocomposites and can pave a gateway for combining different nanomaterials with novel MXene for highly effi-cient deionization of salty water as well as toxic metal and inorganic ions in water and wastewater treatment.
