Functional exploration of extracellular polymeric substances (EPS) in the bioleaching of obsolete electric vehicle LiNixCoyMn1-x-yO2 Li-ion batteries

Deep removal of arsenic from regenerated products of spent V2O5-WO3/TiO2 SCR catalysts and its concurrent activation by bioleaching through a novel mechanism

“…The band at 836 cm -1 indicated the symmetrical stretching of C=O, the band at 1730 cm -1 represented the stretching vibration of C-O, and the band at 3407 cm -1 corresponded to the stretching modes of O-H, showing that carboxyl groups were present in the bioleaching liquor [40][41][42]. The bands at 928 and 1056 cm -1 are linked with C-C and C-N stretching vibration, C-H vibration was observed at 1240, 1449, 2371, 2308 and 2925 cm -1 , and two other broad adsorption peaks at 2066 and 3277 cm -1 were attributed to the stretching modes of N-H in NH2 groups [43][44][45][46][47].…”

Environmentally friendly automated line for recovering aluminium and lithium iron phosphate components of spent lithium-iron phosphate batteries

“…Deep extraction is the recovery of metals from LFP materials, which is an important source (Yuan et al, 2018). Deep extraction mainly includes chemical reduction (Meng et al, 2018a), acid leaching (Zhang et al, 2018a(Zhang et al, , 2018b, bioleaching (Wang et al, 2018a), electrochemical method (Meng et al, 2018b), carbon reductant combined with selective leaching (Huang et al, 2019;Zhang et al, 2018aZhang et al, , 2018b, and heat treatment combined leaching (Huang et al, 2018;Wang et al, 2018b).…”

“…The mass fractions of metallic materials with good conductivity in the recycled products and electrode materials with poor conductivity reach 98.98% and 99.6%, respectively, indicating that the electrostatic content is a good choice for separating different materials from the crushed products of waste LIBs. In terms of flotation, Wang et al (2018) exploited a mechanical separation and heat treatment process to recover valuable metals and graphite from the crushed products of −0.25 mm spent LIBs. Zhang et al (2014) found that lithium cobalt oxide and graphite particles were covered by electrolyte and polyvinylidene difluoride (PVDF) adhesive, so the flotation effect was poor, and the removal of the organic outer layer could improve the flotation effect.…”

Synthetic biology approaches towards the recycling of metals from the environment

“…Following this, the deposits are washed to recover the metal-laden microbes for down-stream processing. As well as microbes, bacterially derived extracellular polymers can also be added to promote growth of microbial cultures [ 11 ], these substances form at the interface between the spent-ore deposits and the bacteria to stimulate biofilm formation and cell-to-cell communication, to encourage an increase in metal recovery [ 12 ].…”

“…This, however, is beginning to change; proteomic analysis of A. ferrooxidans has highlighted the proteins involved in both the generic stress response as well as during iron oxidation on pyrite [ 44 ]. Additionally extracellular polysaccharides, which are important in the bioleaching and oxidation processes [ 11 ], are under investigation in the hope that they encourage and enhance biofilm formation to bolster biomining efficiencies [ 45 ]. Though preliminary, these studies have generated datasets containing promising candidates for adaption, either for the native host, where applicable, or in a model heterologous host.…”