2020-10-152024-05-13https://scholars.lib.ntu.edu.tw/handle/123456789/651434The interaction between water and energy, referred to as water-energy nexus, is well recognized for water sustainability. Alternative water resources such as desalination of seawater and brackish water, and reclamation of wastewater, have been introduced as the strategic solutions to enhance water security. Furthermore, it is important to selectively separate priority ions (e.g., nutrients and precious metals) from wastewaters for resource recovery. Therefore, nanotechnology-enabled electrochemical technology can offer promising opportunities to deliver low-energy desalination and to separate ions selectively. In this study, a new concept of electrochemically-controlled ion separation (ECiS) is purposed to encompass electrochemical processes utilized in various water treatment applications. ECiS focuses on the ion separation technologies by integrating the advanced electrode materials (e.g., nanoporous carbon and redox materials) with a multiple design of ion-exchange membrane cell configuration. This study will be conducted in five predominant approaches: (1) Nanoporous carbon electrodes will be decorated with ion-exchange resin and metal catalyst nanoparticles for enhancing the salt removal and ion selectivity, respectively; (2) Carbonized electrospun fiber electrode will be prepared as a flow-through electrode and battery-like electrode will be used for intercalation of ions. The electrochemical properties of these electrode materials will be characterized by cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. (3) Asymmetric capacitive deionization will be carried out using the modified carbon electrodes for electrosorption of ions, while carbonized electrospun fiber electrode will be performed in a flow-through operation mode to enhance the mass transfer of priority pollutants. (4) Two new membrane cell configurations will be proposed for desalting salt ions at high concentrations, including flow-electrode capacitive deionization and hybrid capacitive-electrodialysis deionization. (5) A practical study of integrating the modular ECiS system with PV-solar cell will be carried out for seawater/brackish water desalination, water reuse, and selective capture of valuable species from wastewaters. The state-of-art of ECiS process can provided as next-generation desalination and water treatment technology.