Linking molecular structures of yeast-derived biosurfactants with their foaming, interfacial, and flotation properties

Dhar, Priyanka; Thornhill, Maria; Roelants, Sophie; Soetaert, Wim; Чернышова, И. В.; Kota, Hanumantha Rao

doi:10.1016/j.mineng.2021.107270

Cited by 9 publications

(3 citation statements)

References 37 publications

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“…In the following, we have opted for centrifugation, which, at a laboratory scale is an easy and effective way to separate the flocculate, here supposed to be a network of wormlike micelles or fibers, depending on the cation. However, other methods, like flotation (Dhar, Havskjold, et al, 2021; Dhar, Thornhill, et al, 2021; Malkapuram et al, 2021), electrokinetic remediation (Tang et al, 2020), or filtration could easily be employed.…”

Section: Discussionmentioning

confidence: 99%

“…However, in the latter case, the essential work, which has started more than 30 years ago, has been carried out on soil pollution (Chen et al, 2021; Kim & Vipulanandan, 2006; Malkapuram et al, 2021; Miller, 1995; Mishra et al, 2021; Mulligan et al, 2001; Mulligan, 2005, 2009, 2021; Mulligan, Yong, & Gibbs, 1999; Mulligan, Yong, Gibbs, James, & Bennett, 1999; Mulligan & Wang, 2006; Prakash et al, 2021; Sonowal et al, 2022), with relatively less contributions to water depollution. Despite such large engineering efforts, including the development of performing extraction processes like flotation (Dhar, Havskjold, et al, 2021; Dhar, Thornhill, et al, 2021; Malkapuram et al, 2021) or electrokinetic remediation (Tang et al, 2020), little is still known about the fundamental interaction mechanisms of between heavy metals and biosurfactants, the latter mainly concerning rhamnolipids (Dahrazma et al, 2008; Ochoa‐Loza et al, 2001a).…”

Section: Introductionmentioning

confidence: 99%

“…This approach, unprecedented for biosurfactants, is controlled by tuning the [ion]/[G‐C18:1] molar ratio and pH (Poirier, Bizien, Zinn, Pernot, & Baccile, 2022; Poirier, Le Griel, Perez, Hermida‐Merino, et al, 2022). In the process proposed here, complementary to other existing separation processes, like flotation (Dhar, Havskjold, et al, 2021; Dhar, Thornhill, et al, 2021; Malkapuram et al, 2021) or electrokinetic remediation (Prakash et al, 2021; Tang et al, 2020), the gel is easily concentrated by centrifugation and removed. UV–vis and atomic absorption spectroscopy (AAS) are used to evaluate the molar fraction of the cations in the supernatant.…”

Section: Introductionmentioning

confidence: 99%

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Heavy metal removal from water using the metallogelation properties of a new glycolipid biosurfactant

Poirier

Ozkaya

Gredziak

et al. 2022

J Surfact & Detergents

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Water pollution by heavy metals is a problem of both western and developing countries.Heavy metal pollution can be associated to human activity, such as wastewaters from processing of ore mining, but also to simple contamination from metal rich soils. Whichever the case, chemical and physical methods are generally employed to depollute water. Since most chemicals are themselves polluting agents, there is an increasing interest in finding biobased and biodegradable alternative chemicals, both efficient in removing metals and benign to the environment. Biosurfactants are green chemicals produced by fermentation of yeasts and bacteria and with a good environmental score. Among many applications, this class of compounds has been used to remove heavy metals from contaminated soils. Within this framework, we propose a new mechanism of depolluting water using a glucolipid biosurfactant, G-C18:1, composed of glucose (G) and a C18:1 fatty acid (oleic acid). This compound is able to form a metallogel by complexing cations in water, thus trapping heavy metals (Cu 2+ , Ni 2+ , Cr 2+ and Co 2+ ) in the gel phase. This mechanism allows to remove up to 95% for cobalt and 88 ± 10%, 80 ± 3% and 59 ± 6% for Cu 2+ , Ni 2+ and Cr 2+ , respectively. A dedicated structural study shows that this is possible because positively charged species induce gelation of G-C18:1 through a micelle-to-wormlike phase transition, most likely driven by a charge neutralization process. This work shows that wise control of the nanoscale properties of green chemicals can strongly benefit to develop a sustainable future.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heavy metal removal from water using the metallogelation properties of a new glycolipid biosurfactant

Poirier

Ozkaya

Gredziak

et al. 2022

J Surfact & Detergents

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Eco-Friendly Collectors for Flotation of Fine Hematite and Malachite Particles

Slabov

Jain

Larsen

et al. 2023

Mining, Metallurgy & Exploration

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The separation of fine mineral particles, especially using environmentally friendly approaches, is one of the main problems in the processing of low-grade ores and the re-processing of mining tailings. This work assesses the potential of biosurfactants as collectors in the flotation of ultrafine (smaller than 20 μm) particles of hematite and malachite. As biosurfactants, we test acetylated acidic (ac-ASL) and lactonic sophorolipids (ac-LSL). In addition, n-dodecyl-β-D-maltoside (DDM) is used as a model non-ionic alkyl disaccharide surfactant, and sodium oleate (NaOl) is used as a reference. The biosurfactants are characterized using surface tension and foam analysis. The interaction of the minerals with the surfactants is characterized using zeta potential, solubility, and single-mineral flotation. The collecting properties of the surfactants are compared for the ultrafine (− 20 μm) and coarser (38–90 µm) particle size in the two-mineral flotation of hematite and malachite against quartz. The ultrafine particle size improves the grade in the oleate flotation of hematite, as well as the grades in the DDM flotation of hematite and malachite, which is explained by the weak interactions of the metal oxides with fatty acids and DDM. At the same time, the flotation with ac-LSL and ac-ASL is highly tolerant to the ultrafine particle size. These results indicate that biosurfactants are an interesting alternative to conventional petroleum-based surfactants in the flotation of Fe and Cu oxides. Moreover, a proper selection of surfactants can help combat the problem of fines. Graphical Abstract

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