| Autor: |
C. Klauber, P.D. Fawell, C.F. Vernon |
| Rok vydání: |
1992 |
| Předmět: |
|
| Zdroj: |
Reactive Polymers. 18:35-45 |
| ISSN: |
0923-1137 |
| DOI: |
10.1016/0923-1137(92)90292-a |
| Popis: |
X-ray photoelectron spectroscopy (XPS) was used to determine the mechanism of adsorption of aurocyanide onto polydiallylamine (PDAA) and the commercially available anion-exchange resins A7 and IRA400. PDAA is known to exhibit unexplained behaviour in Au(CN) 2 − solutions inconsistent with an ion-exchange process. This study has found that aurocyanide adsorbed as an AuCN species rather than Au(CN) 2 − on both the PDAA and also the A7 (weak-base resins) whereas the dicyanide was favoured on the IRA400 (strong base). Elution of the AuCN from PDAA under basic conditions was found to be incomplete, leaving a reduced gold species bound to the polymer accounting for up to 25–30% of the initial adsorbed gold. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
