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Open AccessArticle

Microbial Gold Biosortion and Biomineralization from Aqueous HAuCl4 Solution

Department of Life and Environmental Science, Faculty of Engineering, Hachinohe Institute of Technology, 88-1 Ohbiraki, Myoh, Hachinohe 031-8501, Japan
Author to whom correspondence should be addressed.
Minerals 2020, 10(3), 285;
Received: 17 February 2020 / Revised: 12 March 2020 / Accepted: 19 March 2020 / Published: 21 March 2020
(This article belongs to the Special Issue Biosorption and Biomineralization in Metal Removal)
The removal of gold (III) from aqueous systems using biosorption and biomineralization by microbial cells was investigated. High levels of gold (III) were removed from a hydrogen tetrachloroaurate (III) solution for 72 h by microbial species, including bacteria, fungi and yeasts. Previously, we reported that the amounts of gold (III) removed through biosorption by gram-positive bacteria, fungi, and yeasts was lower than that by gram-negative bacteria. Candida krusei was able to remove large amounts of gold (III) through biosorption and biomineralization. Interestingly, more gold was removed by atomic reduction than by biosorption. Additionally, we examined time, pH, concentration and other factors affecting gold removal. The rate of gold (III) removal by C. krusei increased for 6 h, and then stabilized, however, the rate of removal increased after 22 h, and reached a second equilibrium after 68 h. View Full-Text
Keywords: gold (III) biosorption; gold (0) biomineralization; microorganism; Candida krusei gold (III) biosorption; gold (0) biomineralization; microorganism; Candida krusei
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Maeda, I.; Tsuruta, T. Microbial Gold Biosortion and Biomineralization from Aqueous HAuCl4 Solution. Minerals 2020, 10, 285.

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