Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jece.2020.104203
Title: Solubilization mechanism of diesel in saponin micelle for contaminated montmorillonite washing
Authors: Huang, Zhaolu 
Yao, Yuan 
Ayele, Befkadu Abayneh
Chen, Quanyuan
Xue, Qiaoyi
Keywords: Science & Technology
Technology
Engineering, Environmental
Engineering, Chemical
Engineering
Soil washing
Montmorillonite
Saponin
Micelle
Solubilization
CLAY-MINERALS
ORGANIC POLLUTANTS
SOIL REMEDIATION
TWEEN 80
SURFACTANT
ADSORPTION
ULTRASOUND
SCATTERING
DIFFUSION
EFFICIENT
Issue Date: 1-Oct-2020
Publisher: ELSEVIER SCI LTD
Citation: Huang, Zhaolu, Yao, Yuan, Ayele, Befkadu Abayneh, Chen, Quanyuan, Xue, Qiaoyi (2020-10-01). Solubilization mechanism of diesel in saponin micelle for contaminated montmorillonite washing. JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 8 (5). ScholarBank@NUS Repository. https://doi.org/10.1016/j.jece.2020.104203
Abstract: The biosurfactant was used to remove diesel from contaminated montmorillonite, which was enhanced by humic acid sodium salt (HASS) addition or microbubbles resulted from sonication. It was found that montmorillonite exhibited strong adsorption for saponin, causing the effective critical micelle concentration shift of saponin from 0.2 g L-1 to 0.6 g L-1. The washing efficacy (diesel removal) with 0.6 g L-1 saponin and 2% HASS (HASS/saponin ratio = 2%) increased 14.9 % compared to the control condition (without HASS), whereas the diesel removal with microbubble enhancement (25 min sonication) increased 15.2 % compared to the control condition. Bright-field microscopy, microscope, DLS, PSS, and TEM were used to measure the size of micelles and count micelle numbers. In the addition of 2% HASS, the mean diameter of saponin micelles decreased from 824.9 ± 12.3 nm to 91.3 ± 7.6 nm, and the number of micelles increased from 42,000 to 110,000 at saponin solution of 0.3 g L-1. The hydrophobic core volume increased accordingly. HASS molecule might cause the extension of hydrophobic interior space in micelles to solubilize the hydrocarbon contaminant. In addition to micelles solubilization, the microbubbles enhancement washing process increased the diesel removal by floatation, cavitation in sonication.
Source Title: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
URI: https://scholarbank.nus.edu.sg/handle/10635/229285
ISSN: 22133437
22133437
DOI: 10.1016/j.jece.2020.104203
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