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- W2058184976 abstract "Capacitive deionization (CDI) has recently gained some degree of popularity as a water treatment technology. This paper demonstrates the benefits of coating low surface area carbon electrodes with a sub-micron nanoporous layer of either γ-Al2O3 or SiO2. As shown by cyclic voltammetry, the oxide layer, having pores sizes ranging from larger micro to meso, substantially increased capacitance for ion removal while still maintaining reasonably high ohmic conductivity. The amount of Ca2+ removed in a CDI cell comprised of a SiO2 coated carbon as the negative and γ-Al2O3 carbon as the positive electrode was nearly five times higher than a cell with uncoated electrodes. Removal of Ca2+ followed pseudo first order kinetics, while Cl- removal was better described by a first order kinetic equation. The highest value for Ca2+ adsorption measured was 0.17 mEq/g of electrode material. This compares favorably with previously reported literature values obtained with high surface area carbons. The removal of Ca2+ and Cl− proved to be asymmetric (mEq Ca2+ > mEq Cl− removed). Consequently, to maintain electroneutrality, pH decreased during the removal process. Furthermore, some of the asymmetry was found to be due to a parasitic reaction, that of Cl− ions being oxidized to ClO3−." @default.
- W2058184976 created "2016-06-24" @default.
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- W2058184976 date "2013-01-01" @default.
- W2058184976 modified "2023-09-23" @default.
- W2058184976 title "Asymmetric Capacitive Deionization Utilizing Low Surface Area Carbon Electrodes Coated with Nanoporous Thin-Films of Al<sub>2</sub>O<sub>3</sub>and SiO<sub>2</sub>" @default.
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- W2058184976 doi "https://doi.org/10.1149/2.094308jes" @default.
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