NOBLE METAL ADSORBENT AND USING THE SAME, METHOD OF NOBLE METAL ADSORPTION AND METHOD OF NOBLE METAL RECOVERY

摘要

In the use of proteins as a noble metal adsorbent, it is intended to establish adsorption conditions and an adsorbent that enhance the capability of noble metal adsorption. Using a water soluble protein powder in the state of, directly in powdery form or after dissolution in water, being fixed on an insoluble substrate as an adsorbent for adsorption of noble metal ions from an aqueous solution containing noble metal ions realizes an increase of protein surface area leading to enhancement of adsorption performance. In particular, the performance of noble metal ion adsorption can be strikingly enhanced by the use of lysozyme, bovine serum albumin, egg albumin, casein, soybean protein, etc. as the water soluble protein and by regulating the pH and protein concentration of an aqueous solution containing noble metal ions in conformity with the type of protein employed.