Abstract
Adsorption of Escherichia coli (E. coli) cells on red mud (RM) is important in the interactions between RM and bacteria. The objective of this work is to study adsorption of E. coli onto RM and to determine its influence in relation to the surface properties of RM. The effects of different calcination temperatures on the surface properties of red mud were investigated by thermogravimetric analysis, x-ray diffraction, scanning electron microscopy, Brunauer, Emmett, Teller (surface measurement)/N2 adsorption method, and zeta potential analysis. A higher adsorption capacity was observed from RM calcinated at 700 °C (RM700) due to larger pores formed on the surface of RM. The correlation between the adsorption efficacy and surface properties of RM is discussed and the extended Derjaguin-Landau-Verwey-Overbeek theory suggests that when the adsorption reaches equilibrium, the increased adsorption of E. coli onto RM is due to the smaller energy barrier between E. coli and RM700 as compared with that between E. coli and raw RM (RM0).
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Acknowledgments
This study was jointly supported by National High Technology Research and Development Program (863 Program 2012AA06A109) of China, the open foundation of National Laboratory of Mineral Materials of China University of Geosciences (Grant Nos. 519002310062 and 08A005), as well as Hong Kong Research Grants Council (RGC) General Research Funds (GRF) Nos. CityU 112510 and 112212.
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Tong, W., Zhang, Y., Zhen, Z. et al. Effects of surface properties of red mud on interactions with Escherichia coli. Journal of Materials Research 28, 2332–2338 (2013). https://doi.org/10.1557/jmr.2013.53
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DOI: https://doi.org/10.1557/jmr.2013.53