Investigations of Selective Interactions of the Iron/Aqueous Sodium Chloride System. Part 1. The Adsorption of Chloride Ion by Alpha-Iron(III) Oxide in Sodium Chloride Solutions Saturated by Oxygen at 30C
NAVAL RESEARCH LAB WASHINGTON DC
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A radioisotope procedure was used to investigate the chloride ion adsorption characteristics of crystalline alpha-iron III oxide in dilute sodium chloride 36 Cl-labeled solutions at 30C. The adsorption of the chloride ion was found to be pH dependent, i.e., hydroxyl ions in solution also competed for the active sites on hydrated alpha-iron III oxide surfaces. The chloride ion was preferentially adsorbed in the solution pH range of approximately 2 to 4, while hydroxyl ion adsorption was favored in the pH range above 4 to approximately 9. Only a small fraction of the total surface area determined by the BET method was found active for chloride adsorption in an acid environment.
- Physical Chemistry
- Properties of Metals and Alloys