Selective Mineralization and Recovery of Au(III) from Multi-Ionic Aqueous Systems by Bacillus licheniformis FZUL-63
| Autor: | Minghua Liu, Yangjian Cheng, Zhibin Ke, Zhen Huang, Yuancai Lv, Jianhua Zhang, Xiaojing Bian |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:QE351-399.2
Metal ions in aqueous solution 02 engineering and technology 010501 environmental sciences selective biomineralization 01 natural sciences Metal chemistry.chemical_compound Bacillus licheniformis FZUL-63 Adsorption recovery of Au(III) Aqua regia aqua regia-based metal wastewater Bacillus licheniformis Fourier transform infrared spectroscopy 0105 earth and related environmental sciences Aqueous solution lcsh:Mineralogy biology Geology 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology biology.organism_classification AuNP chemistry Colloidal gold visual_art visual_art.visual_art_medium 0210 nano-technology Nuclear chemistry |
| Zdroj: | Minerals, Vol 9, Iss 7, p 392 (2019) Minerals Volume 9 Issue 7 |
| Popis: | The recovery of precious metals is a project with both economic and environmental significance. In this paper, how to use bacterial mineralization to selectively recover gold from multi-ionic aqueous systems is presented. The Bacillus licheniformis FZUL-63, isolated from a landscape lake in Fuzhou University, was shown to selectively mineralize and precipitate gold from coexisting ions in aqueous solution. The removal of Au(III) almost happened in the first hour. Scanning electron microscope with X-ray energy dispersive spectroscopy (SEM/EDS-mapping) results and fourier transform infrared spectroscopy (FTIR) data show that the amino, carboxyl, and phosphate groups on the surface of the bacteria are related to the adsorption of gold ions. X-ray photoelectron spectroscopy (XPS) results implied that Au(III) ions were reduced to those that were monovalent, and the Au(I) was then adsorbed on the bacterial surface at the beginning stage (in the first hour). X-ray diffraction (XRD) results showed that the gold biomineralization began about 10 h after the interaction between Au(III) ions and bacteria. Au(III) mineralization has rarely been influenced by other co-existing metal ions. Transmission electron microscope (TEM) analysis shows that the gold nanoparticles have a polyhedral structure with a particle size of ~20 nm. The Bacillus licheniformis FZUL-63 could selectively mineralize and recover 478 mg/g (dry biomass) gold from aqua regia-based metal wastewater through four cycles. This could be of great potential in practical applications. |
| Databáze: | OpenAIRE |
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