▎ 摘　　要

NOVELTY - The system has central flow path providing path for the influent containing ions to move. A working electrode (200) is arranged on one side of the central flow path to selectively adsorb target negative ions. A counter electrode is arranged on the other side of the central flow path to adsorb positive ions. A cation exchange membrane is arranged between the counter electrode and the central flow path. The target anion is ion-exchanged with hydroxide ions (OH-) of the reduced graphene oxide and hydroxyapatite compound to selectively remove fluorine adsorbed to the working electrode. USE - Electrochemical system for selective fluorine removal. ADVANTAGE - The energy loss that may occur when unnecessary negative ions are removed, is minimized. The cation exchange membrane relieves the electrostatic charge ion repulsion, thus dramatically improving ion adsorption performance and charge efficiency. The electrochemical system is enabled with excellent stability. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of reduced graphene oxide and hydroxyapatite compound selectively removes fluorine. (Drawing includes non-English language text) Working electrode (200)