摘要
The adsorption properties of Cu 2＋ -loaded montmorillonite clays （MMT-Cu） for Escherichia coli K 88 as a function of time,bacteria concentrations,pH,ionic strength and temperature were investigated.The results showed that the bacteria adsorption onto MMT-Cu surface reached equilibrium after 90 min.The percentages of E.coli K 88 adsorbed onto the surfaces of MMT-Cu and montmorillonite clays （MMT） at equilibrium were 88.9% and 56.5%,respectively.Scanning electron microscopy revealed that a lot of E.coli K 88 adhered to the surface of MMT-Cu.The zeta potential of MMT-Cu was relatively high as compared to that of MMT.The adsorptive ability of MMT-Cu for E.coli K 88 was higher than that of MMT （P 0.05）.Moreover,pH,ionic strength and temperature produced a strong influence on the extent of E.coli K 88 adsorption to surface of MMT-Cu and MMT.The mechanism of adsorption of E.coli onto MMT-Cu may involve electrostatic attraction and physiochemical properties of bacterial cell walls and minerals surfaces.
The adsorption properties of Cu 2＋ -loaded montmorillonite clays （MMT-Cu） for Escherichia coli K 88 as a function of time,bacteria concentrations,pH,ionic strength and temperature were investigated.The results showed that the bacteria adsorption onto MMT-Cu surface reached equilibrium after 90 min.The percentages of E.coli K 88 adsorbed onto the surfaces of MMT-Cu and montmorillonite clays （MMT） at equilibrium were 88.9% and 56.5%,respectively.Scanning electron microscopy revealed that a lot of E.coli K 88 adhered to the surface of MMT-Cu.The zeta potential of MMT-Cu was relatively high as compared to that of MMT.The adsorptive ability of MMT-Cu for E.coli K 88 was higher than that of MMT （P 0.05）.Moreover,pH,ionic strength and temperature produced a strong influence on the extent of E.coli K 88 adsorption to surface of MMT-Cu and MMT.The mechanism of adsorption of E.coli onto MMT-Cu may involve electrostatic attraction and physiochemical properties of bacterial cell walls and minerals surfaces.
基金
supported by the National Natural Science Foundation of China (No.30471255)
the Program for New Century Excellent Talents in University(No.NCET-06-0913)
