Interaction of Silver Ions in Solution with Copper Hexacyanoferrate (II) Cu2Fe(CN)6

✍ Scribed by F. Adekola; M. Fedoroff; S. Ayrault; C. Loos-Neskovic; E. Garnier; L.-T. Yu

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 284 KB
• Volume: 132
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1997.7485

✦ Synopsis

The sorption of silver ions from 0.1 M HNO 3 solutions on copper hexacyanoferrate (II) Cu II 2 Fe II (CN) 6 was investigated using batch experiments. Sorption kinetics and isotherms were studied in which ICP/AES was used for determining the amount of sorbed Ag and the quantities of elements released into the solution. Cyclic voltammetry and X-ray diffraction were used for determining the evolution of the solid. This hexacyanoferrate is very efficient for the removal of silver from aqueous solutions: more than 99.999% of the silver can be removed for initial concentrations less than 0.01 mol/l. Silver sorption proceeds with fast kinetics in a first step and with a further slow evolution. The sorption capacity reaches 1.4 g Ag per g of sorbent. The sorption mechanism is rather complex: there is a destruction of the initial crystalline structure along with the formation of new solid phases, among which silver cyanide is predominant.