Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 648, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.129295
Keywords
Magnetic nanoparticles; Alkyl; amino siloxane; Amphiphilic and cationic characteristics; Demulsification; Reusability
Categories
Funding
- National Natural Science Foundation of China [21878064, 41977017]
- Natural Science Foundation of Zhejiang Province [LY21E030009]
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Oil-in-water emulsion (O/W emulsion) and water-in-oil emulsion (W/O emulsion) are common in various industries. Efficient oil-water separation is important for resource utilization and environmental protection. This study developed amphiphilic magnetic nanoparticles (MNPs) that can demulsify both O/W and W/O emulsions simultaneously, showing excellent demulsification performance and reusability.
Oil-in-water emulsion (O/W emulsion) and water-in-oil emulsion (W/O emulsion) are widely presented in our daily life and production activity. From the perspective of both effective resource utilization and environmental protection, it is of great significance to implement efficient oil-water separation. Although many magnetic nanoparticles (MNPs) with special wettability were successfully developed to separate oil-water mixture, they cannot demulsify O/W and W/O emulsions simultaneously. In this study, a class of amphiphilic MNPs with cationic characteristic has been facilely developed by covalently chemical modification with hydrophobic alkyl siloxane and hydrophilic amino siloxane on the surface of Fe3O4 @SiO2 nanoparticles. The fabricated MNPs were characterized by various techniques and then evaluated for their demulsification performances in both O/W and W/O emulsions. Results showed that neither alkyl siloxane-modified MNPs nor amino siloxane-modified MNPs could effectively demulsify both O/W and W/O emulsions simultaneously. However, when the MNPs were coated with appropriate proportion of alkyl siloxane and amino siloxane, the selected M3-21 could rapidly assemble at the oil-water interface and meanwhile promote droplet coalescence in both types of emulsions, leading to high magnetic demulsification efficiency; specifically, the oil/water removal ratio reached ~95% for sodium dodecyl sulfate (SDS)-stabilized O/W emulsion (SDS=20 mg/L) and Span80-stabilized W/O emulsion (Span80 =5 g/L) at the dosage of 500 mg/L and 30 g/L, respectively. Moreover, the developed MNPs exhibited satisfactory reusability. In view of its convenient synthetic process and superior demulsification performance, the fabricated MNPs were recognized as a class of promising materials for demulsification in both O/W and W/O emulsions from petroleum industry, machinery and food processing industries.
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