US 12,012,342 B2
Method for selective separation of monovalent ionic species using electrodes functionalized with sulfonic groups
Matthew E. Suss, Nesher (IL); Eric N. Guyes, Haifa (IL); Yinke Chen, Haifa (IL); and Charles E. Diesendruck, Binyamina-Givat Ada (IL)
Assigned to Technion Research & Development Foundation Limited, Haifa (IL)
Filed by Technion Research and Development Foundation Limited, Haifa (IL)
Filed on Aug. 31, 2021, as Appl. No. 17/462,054.
Claims priority of provisional application 63/072,954, filed on Sep. 1, 2020.
Prior Publication US 2022/0064029 A1, Mar. 3, 2022
Int. Cl. C02F 1/469 (2023.01); C02F 1/461 (2023.01); C02F 103/08 (2006.01)
CPC C02F 1/4691 (2013.01) [C02F 1/46109 (2013.01); C02F 2001/46133 (2013.01); C02F 2001/46138 (2013.01); C02F 2001/46161 (2013.01); C02F 2103/08 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for selective separation of monovalent ionic species from an ionic solution, the method comprising:
(a) passing the ionic solution comprising a positively charged monovalent ion and a positively charged polyvalent ion, through an electrode capacitor assembly comprising:
a first electrode and a second electrode, said electrodes comprising nanoporous carbon, wherein the first electrode is modified with sulfonate surface groups; and at least one flow channel for the passage of the ionic solution; and
(b) charging the electrode capacitor assembly:
(1) at a voltage of at least about 2.0 V; and
(2) for a scaled charging time of less than about 0.5, thereby providing enhanced adsorption of the positively charged monovalent ion in the first electrode as compared to the adsorption of the positively charged polyvalent ion.