TITLE:
Removal, Recovery and Recycle of Gold (III) from Aqueous Solution Using Persimmon Tannin Gel
AUTHORS:
Yuto Naganeyama, Takehiko Tsuruta
KEYWORDS:
Gold (III) Removal, Gold (III) Recovery, Persimmon Tannin Gel, Reduction, Adsorption, Desorption, Recycles
JOURNAL NAME:
International Journal of Geosciences,
Vol.12 No.12,
December
29,
2021
ABSTRACT: In order to recover much amount of gold, gold removal-recovery cycle was
examined using immobilized persimmon gel, which could remove much amount of
gold (III) from the tetrachloroaurate solution at 30°C. Removal of gold has proceeded different 2
mechanisms stages. At first, gold (III) was adsorbed rapidly on the surface of
the persimmon gels until 2 hours and reached adsorption equilibrium. After
that, the amount of gold removed was re-increased slowly and also reached
equilibrium until 48 hours. The amount of gold removed was affected by the pH of the solution.
The amount of Au removed was the highest at pH 5, which was decreased with
decreasing or increasing the pH of the solution. The amount of gold removed
(mol/g-dry wt. gels) was increased with increasing the gold concentration in
the solution, whereas gold removed ratio was decreased. Gold removed ratio was
increased with increasing the amount of persimmon gel used, whereas the amount
of removed Au (mol/g-dry wt. gels) was decreased. Gold removal-recovery cycles were also examined in detail.