Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8953407 | Hydrometallurgy | 2018 | 6 Pages |
Abstract
An environmentally friendly method using the baker's yeast Saccharomyces cerevisiae was developed to recover soluble Au(III) from neutral and acidic solutions at room temperature. Resting cells of S. cerevisiae were able to reduce aqueous Au(III) ions in HAuCl4 solution to metallic Au(0) at pHâ¯7.0 within 120â¯min when formate was provided as the electron donor under anaerobic conditions. Gold nanoparticles were deposited on the cell surface of S. cerevisiae. The S. cerevisiae cells were also applicable to a bio-material for adsorbing aqueous Au(III) ions from HAuCl4 solution at pHâ¯1.0 under air atmosphere. When processing the aqua regia leachate of electronic waste (Central Processing Units, CPU), the S. cerevisiae cells were able to rapidly and selectively collect aqueous Au(III) ions from the aqua regia leachate at pHâ¯1.2 within 10â¯min. Our proposed microbial methods enable the rapid and efficient recovery of gold over the pH range 1.0 to 7.0.
Related Topics
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Chemical Engineering (General)
Authors
Norizoh Saitoh, Ryotaro Fujimori, Masaki Nakatani, Daijiro Yoshihara, Toshiyuki Nomura, Yasuhiro Konishi,