Functional exploration of extracellular polymeric substances (EPS) in the bioleaching of obsolete electric vehicle LiNix Coy Mn1-x-y O2 Li-ion batteries

Journal of Hazardous Materials
Jia WangBaoping Xin

Abstract

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...Continue Reading

Citations

Jul 7, 2020·Biochemical Society Transactions·Michael J Capeness, Louise E Horsfall
Jan 8, 2021·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Haijun BiHuabing Li
Jul 9, 2021·Environmental Science and Pollution Research International·Leonard Owino Kachieng'a, John Onolame Unuofin

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