The Fabrication of Bio-ceramsite for the Removal of Heavy Metals and Its Toxicity to Bacteria
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2015年第3期
论文作者：石岩 SUN Ken 齐学斌 GAO Qing
文章页码：649 - 654
摘 要：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 fi ndings 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 profi le of C. freundii suggests the alteration of carbonyl, amide and phosphonic groups on the cell membrane.
石岩1,2，SUN Ken2,3，齐学斌1，GAO Qing1
1. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences2. School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power3. School of Water Resource & Environment, China University of Geosciences
摘 要：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 fi ndings 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 profi le of C. freundii suggests the alteration of carbonyl, amide and phosphonic groups on the cell membrane.
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