title: Evaluation of biosurfactant obtained from Lactobacillus pentosus as foaming agent in froth flotation.
abstract: This study analyzes the kinetics of sediment sorption on two chemical surfactants (Tween 20 and SDS) and a biotechnologically produced surfactant (obtained from Lactobacillus pentosus). Biosurfactants were produced by fermentation of hemicellulosic sugars from vineyard pruning waste supplied as a substrate to L. pentosus. Results obtained showed that almost no SDS was adsorbed onto the sediments, whereas Tween 20 and biosurfactants from L. pentosus were absorbed after a few minutes. Kinetic models revealed that adsorption of surfactant onto riverbed sediments is governed not only by an intra-particle diffusion model (evaluated by the Weber and Morris model), but also by surface reaction models (evaluated by first, second, third order equations and Elovich equation), showing the best fit when employing the Elovich model. The adsorption properties showed by biosurfactant from L. pentosus onto sediments present it as a potential foaming agent in froth flotation.
authors.affiliation: Chemical Engineering Department, School of Industrial Engineering (EEI), University of Vigo, Campus As Lagoas-Marcosende, 36310 Pontevedra-Vigo, Spain.
authors.forename: X
authors.initials: X
authors.lastname: Vecino
authors.forename: R
authors.initials: R
authors.lastname: Devesa-Rey
authors.forename: J M
authors.initials: JM
authors.lastname: Cruz
authors.forename: A B
authors.initials: AB
authors.lastname: Moldes
mesh_terms: D000327:Adsorption; D001709:Biotechnology / Q000379:methods; D019015:Geologic Sediments / Q000737:chemistry; D007700:Kinetics; D007778:Lactobacillus / Q000378:metabolism*; D011136:Polysorbates / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D011136:Polysorbates; D013501:Surface-Active Agents; D012967:Sodium Dodecyl Sulfate
keywords: Biosurfactants; Flotation; Sediments; Sodium dodecylsulphate (SDS); Tween 20