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Photooxidative mineralization of microorganisms-produced glycolipid biosurfactants by a titania-mediated advanced oxidation process

Paper ID Volume ID Publish Year Pages File Format Full-Text
27153 44005 2010 6 PDF Available
Title
Photooxidative mineralization of microorganisms-produced glycolipid biosurfactants by a titania-mediated advanced oxidation process
Abstract

The photooxidative mineralizations of two microorganisms-produced glycolipid biosurfactants 4-O-(4′,6′-di-O-acetyl-2′,3′-di-O-alkanoyl-β-d-mannopyranosyl)-d-erythritol (MEL-A) and 1-O-(6′-O-acetyl-2′,3′-di-O-alkanoyl-β-d-mannopyranosyl)-d-erythritol (MEL-B) were examined by monitoring the temporal changes in UV absorption, the time profiles of CO2 evolution and the changes in interfacial tension occurring by an advanced oxidation process in the presence of a metal-oxide (TiO2). Features of their mineralization are compared to the photomineralization of the anionic dodecylbenzene sulfonate (DBS) surfactant carried out under otherwise identical conditions. The adsorption of surfactants on the TiO2 surface and the positions of attack of the photogenerated OH radicals on the surfactants’ structure were assessed by molecular orbital (MO) calculations of partial charges and frontier orbital electron densities, respectively. The photodegradation of DBS was faster than the MELs as also evidenced by surface tension measurements, whereas the photomineralization of the anionic DBS surfactant was definitely slower than that of the MEL biosurfactants due to the hydrophobic alkyl chain in the DBS structure. Possible initial mechanistic stages of the photooxidation of MEL-A and MEL-B are proposed based on experimental data and comparison with MO calculations.

Keywords
Glycolipid biosurfactants; Dodecylbenzene sulfonate; Titanium dioxide; Photomineralization
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Photooxidative mineralization of microorganisms-produced glycolipid biosurfactants by a titania-mediated advanced oxidation process
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 209, Issues 2–3, 25 January 2010, Pages 147–152
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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