Abstract
Heavy metal pollution seriously threatens the environment and human health. The biosorption of heavy metals has attracted worldwide attention due to its cost-effectiveness and environmental friendliness. It is significant to develop biosorbents with excellent adsorption performance. Sphingopyxis is widely used in the removal of various organic pollutants, but its potential application in heavy metal adsorption has been largely overlooked. This study investigates the biosorption of U(VI) onto live and dead cells of a Sphingopyxis strain YF1. The effects of pH, contact time and initial ion concentration on U(VI) adsorption investigated, and kinetic and isothermal models were used to fit the adsorption results. The results show that under pH 3–6, the adsorption of U(VI) by YF1 live cells increased with the increase of the pH. Both the pseudo-first order and pseudo-second order models can satisfactorily interpret the adsorption by live and dead cells. Three isothermal adsorption models (Langmuir, Freundlich, and Sips) were used to fit the adsorption process. The adsorption of uranium by live and dead cells was best fitted by the Sips model. The maximal adsorption capacities of U(VI) by live and dead cells were 140.7 mg g−1 and 205.7 mg g−1, respectively. The mechanisms of U(VI) adsorption by Sphingopyxis sp. YF1 were revealed. Scanning electron microscopy and energy dispersive spectroscopy (SEM–EDS) show that U(VI) was deposited on the surface of the bacterial cells. Fourier-transform infrared spectroscopy (FTIR) shows that amine, hydroxyl, alkyl, amide I, amide II, phosphate, carboxylates and carboxylic acids were the major functional groups that are involved in U(VI) adsorption by live and dead cells. X-ray photoelectron spectroscopy (XPS) suggests that the main functional groups of live cells involved in adsorption were O = C-O, C–OH/C–O–C and N–C = O. This study indicates Sphingopyxis sp. YF1 is a high-efficiency U(VI)-adsorbing strain, promising to remove U(VI) from aquatic environment.
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The authors are grateful to all research staff that contributed to the data collection required for this study.
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This work was supported by Funded by Hunan Provincial Key R&D Program (2019SK2041, 2022SK2089), Hunan Provincial Excellent Youth Fund (2020JJ3053), Hunan Young Talent Support Program (2021RC3107), Natural Science Foundation of Hunan Province(2022JJ40372), Hunan Provincial Innovation and Entrepreneurship Training Program for College Students (S202110555002).
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Xinxin Chen: Conceptualization, Methodology, Investigation, Writing – original draft. Siheng Cai: Investigation, Writing –review & editing. Nan Zhang: Supervision, Software, Data curation. Jieqiu Yang: Supervision, Software, Data curation. Tangjian Peng: Funding acquisition, Conceptualization, Methodology, Writing – review & editing. Fei Yang: Funding acquisition, Supervision, Formal analysis, Writing – review & editing.
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Chen, X., Cai, S., Zhang, N. et al. Biosorption of U(VI) and mechanisms by live and dead cells of Sphingopyxis sp. YF1. Environ Sci Pollut Res 30, 109469–109480 (2023). https://doi.org/10.1007/s11356-023-29881-z
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DOI: https://doi.org/10.1007/s11356-023-29881-z