Ascorbate-Promoted Whole-Cell Biocatalysis for Lithium Bio-Recovery from Spent LiFePO4 Cathodes
Ascorbate-Promoted Whole-Cell Biocatalysis for Lithium Bio-Recovery from Spent LiFePO4 Cathodes
研究概述
以氧化葡萄糖酸杆菌浸出废旧磷酸铁锂，加入25 mM抗坏血酸可缓解细胞氧化应激，并参与PQQ介导的胞外氧化还原循环生成H2O2，促进LFP氧化及锂释放。10 g/L矿浆浓度下7天锂浸出率92.7%；锂进一步以磷酸锂回收，富FePO4残渣还可用于染料去除。
谱图与表征信息
Figure 5. Normalized (a) and LCF (b) of Fe K-edge XANES spectra of LFP, FP, amorphous FP, and 2-line Fh, as well as different (bio)leaching residues including the residues after leaching with culture medium without bacteria (bacteria-free), residues after bioleaching with two-step approach, residues after leaching in bacteria-free system with the addition of 25 mM AA (AA control), and residues after G. oxydans bioleaching of spent LFP powder with addition of 25 mM AA by two-step approach. Fe Mössbauer spectra (c) of 25 mM AA bioleaching residues, amorphous FP, and spent LFP powder. Adapted with permission from ref (20). Copyright 2025, Elsevier. The LCF results and the fit parameters of Fe Mössbauer spectra are shown in Tables S2 and S3 (in Supporting Information), respectively. Pulp density was 10.0 g L−1. “LFP”, “FP”, “2-line Fh”, and “AA” stand for lithium iron phosphate, iron phosphate, 2-line ferrihydrite, and ascorbic acid, respectively.