Adsorption for Au~(3+) by Persimmon Tannins Immobilized on Collagen Fiber

摘要

A novel adsorbent which is effective to adsorb Au~(3+) was prepared using immobilized persimmon tannin (PT) on collagen fiber by glutaraldehyde crosslinking. The adsorption behaviour of this new adsorbent to Au~(3+) in aqueous solution was investigated. The effects of various factors such as initial solution pH, temperature, ionic strength and initial concentration of Au~(3+) on the influence of the adsorption process were studied. The equilibrium adsorption capacity reached 2347 mg/g at 323 K and pH value 2.0 when the initial concentration of Au~(3+) in aqueous solution was 500 mg/L. The immobilized PT was characterized by FT-IR, XRD and SEM. The results indicated that Au~(3+) changed to gold by oxidation adjacent phenol hydroxyl groups of persimmon tannin. Experiments also showed that adsorption isotherms of immobilized tannin for Au~(3+) could be described by Langmuir models. Immobilized PT adsorption provided a new way for the separation of the precious metal ions