title: Optimization of salt adsorption rate in membrane capacitive deionization.
abstract: Membrane capacitive deionization (MCDI) is a water desalination technique based on applying a cell voltage between two oppositely placed porous electrodes sandwiching a spacer channel that transports the water to be desalinated. In MCDI, ion-exchange membranes are positioned in front of each porous electrode to prevent co-ions from leaving the electrode region during ion adsorption, thereby enhancing the salt adsorption capacity. MCDI can be operated at constant cell voltage (CV), or at a constant electrical current (CC). In this paper, we present both experimental and theoretical results for desalination capacity and rate in MCDI (both in the CV- and the CC-mode) as function of adsorption/desorption time, salt feed concentration, electrical current, and cell voltage. We demonstrate how by varying each parameter individually, it is possible to systematically optimize the parameter settings of a given system to achieve the highest average salt adsorption rate and water recovery.
authors: Department of Environmental Technology, Wageningen University, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands. ran.zhao@wetsus.nl
authors: R
authors: R
authors: Zhao
authors: O
authors: O
authors: Satpradit
authors: H H M
authors: HH
authors: Rijnaarts
authors: P M
authors: PM
authors: Biesheuvel
authors: A
authors: A
authors: van der Wal
mesh_terms: D000327:Adsorption; D025802:Electric Capacitance; D004566:Electrodes; D017136:Ion Transport; D007477:Ions; D008567:Membranes, Artificial; D016062:Porosity; D012015:Reference Standards; D012965:Sodium Chloride / Q000302:isolation & purification*; D055672:Static Electricity; D018508:Water Purification / Q000379:methods*
chemical_list: D007477:Ions; D008567:Membranes, Artificial; D012965:Sodium Chloride