Abstract
Through the study of biosorption of Pb2+ by lactic acid bacteria, two strains called CN-011 and CN-005 with high tolerance and great adsorption to lead were screened. The minimum bactericidal concentration of lead ions for both CN-011 and CN-005 was 1.45 mmol/L. The optimal culture conditions for the removal of 30 mg/L lead ions were achieved by culturing lactic acid bacteria at an initial pH of 7.0, 37 °C and 120 rpm for 48 h. The adsorption rate of CN-011 and CN-005 for Pb2+ were 85.95% and 86.78%, respectively. In simulated wastewater samples, the average adsorption rate of Pb2+ was 73.38% for CN-011 and 74.15% for CN-005. The mechanism of biosorption was characterized by Fourier Transform infrared spectroscopy, Scanning Electron Microscope—Energy Dispersive Spectrometer, X-ray Photoelectron Spectroscopy, which revealed that Pb2+ mainly reacted with hydroxyl ions in peptidoglycan or polysaccharide, and carboxylate radical in teichoic acid or protein on the surface of lactic acid bacteria cell wall. The deposits produced on the bacterial surface were identified as lead oxide and lead nitrate.
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GL: Conceptualization, Methodology, Data curation, Writing – original draft. WG: Methodology, Validation. YW: Methodology, Validation. YZ: Methodology, Validation. HC: Validation, Investigation, Writing – review and editing. ML: Validation, Investigation, Writing – review and editing. YC: Validation, Investigation, Writing – review editing.
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Liu, G., Geng, W., Wu, Y. et al. Biosorption of lead ion by lactic acid bacteria and the application in wastewater. Arch Microbiol 206, 18 (2024). https://doi.org/10.1007/s00203-023-03755-x
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DOI: https://doi.org/10.1007/s00203-023-03755-x