Author(s)

Yuto Naganeyama, Takehiko Tsuruta^*

Department of Life and Environmental Science, Hachinohe Institute of Technology, Hachinohe, Japan.

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.

Gold (III) Removal, Gold (III) Recovery, Persimmon Tannin Gel, Reduction, Adsorption, Desorption, Recycles

Naganeyama, Y. and Tsuruta, T. (2021) Removal, Recovery and Recycle of Gold (III) from Aqueous Solution Using Persimmon Tannin Gel. International Journal of Geosciences, 12, 1084-1094. doi: 10.4236/ijg.2021.1212058.