An efficient and environmental-friendly dispersant based on the synergy of amphiphilic surfactants for oil spill remediation. (January 2019)

• Record Type: Journal Article
• Authors: Jin, Jiafeng; Wang, Haoyu; Jing, Yannan; Liu, Min; Wang, Daigang; Li, Yiming; Bao, Mutai
• Is Part Of: Chemosphere. Volume 215(2019)
• Page Start: 241
• Page End: 247
• Publication Date: 2019-01
• Subjects: Dispersant -- Amphiphiles -- Emulsification -- Synergy -- Visualization simulation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2018.09.159
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Eliminating the adverse environmental impact of chemical dispersants for oil spill has been a significant challenge since decades ago. Here, we prepared an effective and environmentally-friend dispersant with stable emulsifying capacity by the soybean lecithin and Tween 80. The mean droplet diameters of emulsions prepared by decane decreased from 11.3 to 4.1 μm, the emulsification index of emulsion climbed from 0 to 22.0% by 0.5 wt% dispersant. This dispersant exhibits favorable emulsifying capacity when the temperature ranges from 10 to 40 °C, pH within 5–7, and the concentration of inorganic cation is 30000 mg/L. Fluorescence microscopy analysis, FTIR, and the interfacial tension meter were employed to investigate the interaction between the soybean lecithin and Tween 80, a clear redshift of the hydroxyl group on the lecithin/Tween 80 dispersant and the detected surfactants over the oil-water interface confirm that there exists a synergy between the lecithin and Tween 80 due to the electrostatic attractions, which tremendously contribute to the reduction in the interfacial tension between water and oil. To further understand the influence of the dispersant on the oil hydrocarbon concentration in the water column, visualization simulation with the varying depths were performed. The results showed that the oil hydrocarbon concentration in the water column bottom was proportional to the addition of the dispersant, which facilitates spilled oil dispersing into smaller droplets, accelerates the biodegradation process. Hence, the lecithin/Tween 80 dispersant can be perceived as a promising alternative for oil spill remediation. Graphical abstract: Highlights: Efficient and environmental-friendly dispersant for oil spill is prepared. The synergy between lecithin and Tween 80 plays a vital role in enhancing the emulsifying capacity of the dispersant. The environmental factors that affect the performance of the dispersant have been studied. Visualization simulation confirms the novel dispersant can effectively facilitate the dispersion of spilled oil.