Abstract
Removal, recovery, and recycles of gold(III) from aqueous tetrachloroauric acid solution using immobilized <i>Pseudomonas saccharophila</i> was investigated. The effect of pH, cell amounts on gold removal, and the time course of gold removal by <i>P. saccharophila</i> cells, which removed large amounts of gold from a solution containing hydrogen tetrachloroauric(III) acid were reported in detail. Additionally, to approve the amount of gold recovery much higher, the removal of gold(III) by biosorption and biomineralization from aqueous systems using microbial cells, gold(III) removal by those using microbial cells was investigated. The oxidative recovery of gold after reduced gold(0) by the oxidation using aqueous thiourea solution, and recycles of gold reduction-oxidation cycles were also investigated.
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