Flocculation behaviour of hematite-kaolinite suspensions in presence of extracellular bacterial proteins and polysaccharides

Poorni, S and Natarajan, KA (2014) Flocculation behaviour of hematite-kaolinite suspensions in presence of extracellular bacterial proteins and polysaccharides. In: COLLOIDS AND SURFACES B-BIOINTERFACES, 114 . pp. 186-192.

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Abstract

Cells of Bacillus subtilis exhibited higher affinity towards hematite than to kaolinite. Bacterial cells were grown and adapted in the presence of hematite and kaolinite. Higher amounts of mineral-specific proteinaceous compounds were secreted in the presence of kaolinite while hematite-grown cells produced higher amounts of exopolysaccharides. Extracellular proteins (EP) exhibited higher adsorption density on kaolinite which was rendered more hydrophobic. Hematite surfaces were rendered more hydrophilic due to increased adsorption of extracellular polysaccharides (ECP). Significant surface chemical changes were produced due to interaction between minerals and extracellular proteins and polysaccharides. Iron oxides such as hematite could be effectively removed from kaolinite clays using selective bioflocculation of hematite after interaction with EP and ECP extracted from mineral-grown cells. (C) 2013 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	COLLOIDS AND SURFACES B-BIOINTERFACES
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copyright for this article belongs to the ELSEVIER SCIENCE BV, NETHERLANDS
Keywords:	Bioflocculation; Extracellular proteins; Polysaccharides; Hematite; Kaolinite
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	19 May 2014 06:51
Last Modified:	19 May 2014 06:51
URI:	http://eprints.iisc.ac.in/id/eprint/48918

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