Ionic liquid-biosurfactant blends as effective dispersants for oil spills: Effect of carbon chain length and degree of saturation

Hassan Shah, M.U. and Bhaskar Reddy, A.V. and Yusup, S. and Goto, M. and Moniruzzaman, M. (2021) Ionic liquid-biosurfactant blends as effective dispersants for oil spills: Effect of carbon chain length and degree of saturation. Environmental Pollution, 284. ISSN 02697491

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Abstract

The well-known toxicity of conventional chemical oil spill dispersants demands the development of alternative and environmentally friendly dispersant formulations. Therefore, in the present study we have developed a pair of less toxic and green dispersants by combining lactonic sophorolipid (LS) biosurfactant individually with choline myristate and choline oleate ionic liquid surfactants. The aggregation behavior of resulted surfactant blends and their dispersion effectiveness was investigated using the baffled flask test. The introduction of long hydrophobic alkyl chain with unsaturation (attached to choline cation) provided synergistic interactions between the binary surfactant mixtures. The maximum dispersion effectiveness was found to be 78.23 for 80:20 (w/w) lactonic sophorolipid-choline myristate blends, and 81.15 for 70:30 (w/w) lactonic sophorolipid-choline oleate blends at the dispersant-to-oil ratio of 1:25 (v/v). The high dispersion effectiveness of lactonic sophorolipid-choline oleate between two developed blends is attributed to the stronger synergistic interactions between surfactants and slower desorption rate of blend from oil-water interface. The distribution of dispersed oil droplets at several DOR were evaluated and it was observed that oil droplets become smaller with increasing DOR. In addition, the acute toxicity analysis of developed formulations against zebra fish (Danio rerio) confirmed their non-toxic behavior with LC50 values higher than 400 ppm after 96 h. Overall, the proposed new blends/formulations could effectively substitute the toxic and unsafe chemical dispersants. © 2021 Elsevier Ltd

Item Type: Article
Additional Information: cited By 15
Uncontrolled Keywords: Binary mixtures; Biomolecules; Blending; Dispersions; Drops; Oil spills; Phase interfaces; Surface active agents; Toxicity, Acute toxicity; Biosurfactants; Carbon-chain length; Chemical dispersant; Dispersants; Effect of carbons; Oil droplets; Oil spill dispersion; Sophorolipids; Synergistic interaction, Ionic liquids, biosurfactant; carbon; choline myristate; choline oleic acid; lactonic sophorolipid; unclassified drug; water; carbon; ionic liquid; petroleum; surfactant, aggregation; carbon; cation; desorption; interface; ionic composition; oil spill; saturation; surfactant; waste treatment, acute toxicity; animal experiment; Article; chemical interaction; chemical structure; clinical effectiveness; controlled study; desorption; dispersion; hydrophobicity; LC50; nonhuman; oil spill; zebra fish; analysis; animal; toxicity; water pollutant, Danio rerio, Animals; Carbon; Ionic Liquids; Petroleum; Petroleum Pollution; Surface-Active Agents; Water Pollutants, Chemical
Depositing User: Mr Ahmad Suhairi UTP
Date Deposited: 10 Nov 2023 03:29
Last Modified: 10 Nov 2023 03:29
URI: https://khub.utp.edu.my/scholars/id/eprint/14543

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