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Surface chemical characterisation of Paenibacillus polymyxa before and after adaptation to sulfide minerals
Luleå tekniska universitet.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
Indian Institute of Science, Bangalore.
2001 (English)In: International Journal of Mineral Processing, ISSN 0301-7516, E-ISSN 1879-3525, Vol. 62, no 1-4, p. 3-25Article in journal (Refereed) Published
Abstract [en]

A heterotroph Paenibacillus polymyxa bacteria is adapted to pyrite, chalcopyrite, galena and sphalerite minerals by repeated subculturing the bacteria in the presence of the mineral until their growth characteristics became similar to the growth in the absence of mineral. The unadapted and adapted bacterial surface have been chemically characterised by zeta-potential, contact angle, adherence to hydrocarbons and FT-IR spectroscopic studies. The surface free energies of bacteria have been calculated by following the equation of state and surface tension component approaches. The aim of the present paper is to understand the changes in surface chemical properties of bacteria during adaptation to sulfide minerals and the projected consequences in bioflotation and bioflocculation processes.The mineral-adapted cells became more hydrophilic as compared to unadapted cells. There are no significant changes in the surface charge of bacteria before and after adaptation, and all the bacteria exhibit an iso-electric point below pH 2.5. The contact angles are observed to be more reliable for hydrophobicity assessment than the adherence to hydrocarbons. The Lifschitz--van der Waals/acid--base approach to calculate surface free energy is found to be relevant for mineral--bacteria interactions. The diffuse reflectance FT-IR absorbance bands for all the bacteria are the same illustrating similar surface chemical composition. However, the intensity of the bands for unadapted and adapted cells is significantly varied and this is due to different amounts of bacterial secretions underlying different growth conditions.

Place, publisher, year, edition, pages
2001. Vol. 62, no 1-4, p. 3-25
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-8369DOI: 10.1016/S0301-7516(00)00043-0ISI: 000167848600002Scopus ID: 2-s2.0-0035341430Local ID: 6e126560-9cb3-11db-8975-000ea68e967bOAI: oai:DiVA.org:ltu-8369DiVA, id: diva2:981261
Note
Validerad; 2001; 20070105 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Rao, HanumanthaForssberg, Eric

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