Adsorptive property of Cu2+–ZnO/cetylpyridinium–montmorillonite complexes for pathogenic bacterium in vitro |
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| Institution: | 1. College of Chemistry and Chemical Engineering, Ningxia University, Helanshan Rd. 539, Yinchuan 750021, China;2. College of Life Science, Ningxia University, Yinchuan 750021, China;1. Chemistry Department of Paraíba Federal University, João Pessoa, Paraíba, Brazil;2. Instituto de Química, Universidade Estadual de Campinas, Caixa Postal 6154, 13083-970 Campinas, São Paulo, Brazil;3. Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8220, Laboratoire d''archéologie moléculaire et structurale (LAMS), Boîte courrier 225, 4 place Jussieu, 75005 Paris, France;1. College of Environmental Science & Engineering, Nankai University, Tianjin, China;2. College of Energy & Environmental Engineering, Hebei University of Technology, Tianjin, China;1. Department of Chemistry, National Dong Hwa University, Hualien 97401, Taiwan;2. Department of Chemistry, Nizam College, Osmania University, Hyderabad, India |
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| Abstract: | Cu2+–ZnO/cetylpyridinium–montmorillonite (Cu2+–ZnO/CP–MMT) complexes were prepared using montmorillonite (MMT), Cu2+, Zn2+, and cetylpyridinium (CP). The goal was to assess comparatively the adsorption properties of Cu2+–ZnO/CP–MMT in vitro using pathogenic Escherichia coli. The results showed that Cu2+–ZnO/CP–MMT adsorbed significantly (P < 0.05) more E. coli compared with the parent clay. The adsorption process of bacterial cells occurring on the modified MMT surface reached equilibrium after 90 min. The percentages of E. coli adsorbed onto the surfaces of Cu2+–ZnO/CP–MMT and MMT in adsorption equilibrium were 84.66% and 47.01%, respectively. Adsorption data from the bacteria-clay systems followed the Langmuir and Freundlich isotherms, but not the BET isotherm. Adsorption of E. coli in acidic medium was higher than in alkaline medium. The extent of bacteria adsorption onto the modified MMT increased with decreasing ionic strength, and with increasing temperature. The processes of E. coli adsorption onto the tested adsorbents were endothermic and spontaneous at the experimental temperature. The mechanism of adsorption of bacteria on Cu2+–ZnO/CP–MMT may involve enhanced hydrophobicity and the reversal of surface charge from negative to positive. |
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