424833 Transport of Ions in Porous Carbon Electrodes during Capacitive Deionization

Wednesday, November 11, 2015: 12:30 PM
251C (Salt Palace Convention Center)
Jorge F. Gabitto1, Ketki Sharma2, Yong-Ha Kim2, Sotira Yiacoumi3 and Costas Tsouris4, (1)Chem. Eng., PVAMU, Prairie View, TX, (2)Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, (3)School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, (4)Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN

Desalination of brackish aqueous solutions has been studied using a novel experimental technique and a theoretical model. Neutron imaging has been employed to visualize lithium ions in mesoporous carbon materials, which are used as electrodes in capacitive deionization (CDI) for water desalination. Experiments were conducted with a flow-through CDI cell designed for neutron imaging and with lithium-6 chloride (6LiCl) as the electrolyte. Sequences of neutron images have been obtained at a relatively high concentration of 6LiCl solution to provide information on the transport of ions within the electrodes. A new model that computes the individual ionic concentration profiles inside mesoporous carbon electrodes has been used to simulate the CDI process. Modifications have also been introduced into the simulation model to calculate results at high electrolyte concentrations. Experimental data and simulation results provide insight into the CDI process. The combination of experimental information, obtained through neutron imaging, with the theoretical model will help in the design of CDI devices, which can improve the process for water desalination.

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See more of this Session: Fundamentals of Electrochemical Processes II
See more of this Group/Topical: Engineering Sciences and Fundamentals