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The fabrication of bio-ceramsite for the removal of heavy metals and its toxicity to bacteria

  • Biomaterials
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Abstract

Bio-ceramsite technology is one of the most effective technologies in the pretreatment of drinking water. In this work, bio-ceramsite was fabricated by Citrobacter freundii (C. freundii) immobilization on the ceramsite. The findings of the current study suggest that the bio-ceramites showed biosorption abilities for Cd(II) and Pb(II) and the removal efficiency for Pb(II) is lower than Cd(II). The adsorption mechanism can be attributed to electrostatic attraction and covalent bond. The morphology of the cells changed after the adsorption of Cd(II) and Pb(II) due to the dissociation of the assembly of peptidoglycan and lipopolysaccharide. The fluorescence polarization has shown a significant decrease in membrane fluidity and an increase of permeability of cell membrane. The spectral profile of C. freundii suggests the alteration of carbonyl, amide and phosphonic groups on the cell membrane.

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Correspondence to Xuebin Qi  (齐学斌).

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Funded by the National High Technology Research and Development Program of China (863 Program) (No. 2012AA100604)

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Shi, Y., Sun, K., Qi, X. et al. The fabrication of bio-ceramsite for the removal of heavy metals and its toxicity to bacteria. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 30, 649–654 (2015). https://doi.org/10.1007/s11595-015-1205-7

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  • DOI: https://doi.org/10.1007/s11595-015-1205-7

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