Functional exploration of extracellular polymeric substances (EPS) in the bioleaching of obsolete electric vehicle LiNixCoyMn1-x-yO2 Li-ion batteries
| Autor: | Jia Wang, Yihui Bao, Can Qian, Tianqi Niu, Yiran Yang, Baoping Xin, Bingyang Tian |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
inorganic chemicals
Environmental Engineering Chemistry Health Toxicology and Mutagenesis 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Pollution Cathode Corrosion law.invention Ion Electron transfer Extracellular polymeric substance Adsorption Chemical engineering law Bioleaching Environmental Chemistry Electric current 0210 nano-technology Waste Management and Disposal 0105 earth and related environmental sciences |
| Zdroj: | Journal of Hazardous Materials. 354:250-257 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2018.05.009 |
| Popis: | As a fairly new concept, the recovery of valuable metals from urban mining by using bioleaching has become a hotspot. However, the function of extracellular polymeric substances (EPS) in the bioleaching of urban mining gains little attention. The current study used spent EV LIBs to represent urban mining products and systematically explored the function and role of EPS in the attachment of cells to the cathodes, formation of aggregates (cell-EPS-cathode), variation in the electrical and surface properties of the aggregates, concentration of both Fe2+ and Fe3+ surrounding the aggregates, electron transfer inside the aggregates and metals released from the aggregates. The results indicated that a strong adhesion of cells to the cathodes occurs mediated by EPS via both hydrophobic force as a main role and electrostatic force as a minor role. Second, the EPS not only adsorb Fe3+ but also more strongly adsorb Fe2+ to concentrate the Fe2+/Fe3+ cycle inside the aggregates, witnessing stronger reductive attack on the high valence state of metals as a contact reductive mechanism. Third, the retention or addition of EPS elevated the electronic potential and reduced the electronic resistance to lift the corrosion electric current, thereby boosting the electron transfer and metal dissolution. |
| Databáze: | OpenAIRE |
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