Novel castor oil/water/ethanol Pickering emulsions stabilized by magnetic nanoparticles and magnetically controllable demulsification
Novel castor oil/water/ethanol Pickering emulsions stabilized by magnetic nanoparticles and magnetically controllable demulsification
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DOI：
10.1016/j.colsurfa.2023.132424
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发表时间：
2023-09-19
影响因子：
5.2
通讯作者：
Urena-Benavides，Esteban E.
中科院分区：
文献类型：
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作者：
Hasan，Mohammad Jahid;Chen，Peng;Urena-Benavides，Esteban E.
开发了一种新型的蓖麻油/水/乙醇Pickering乳液，由磁性纳米颗粒（NPs）稳定，允许按需破乳通过外部磁场使用蓖麻油从水溶液中提取乙醇。通过Fe 3 O 4-包覆的纤维素纳米晶体（CNC@Fe3O4）和木质素-包覆的Fe 3 O 4 NPs（lignin@Fe3O4）稳定乳液。研究了在不同蓖麻油与乙醇-水比率（50/50和70/30）、不同NP浓度和水相中乙醇浓度下乳液的稳定性。采用永磁体对乳状液的磁控破乳能力进行了研究。结果表明，对于所有乙醇浓度，70/30乳剂比50/50乳剂更稳定。此外，增加NP浓度增加了乳液稳定性，因此，lw/v%NP浓度提供了更稳定的系统。然而，所有的乳剂都被永磁体成功地打破。然而，乙醇的存在提高了外部磁场破乳这些分散体的能力。此外，将使用过的杂化NP回收并再循环三个循环。用X射线衍射（XRD）和振动样品磁强计（VSM）对回收的NP进行表征，表明它们保留了它们的饱和磁化强度和晶体结构，表明它们在多次回收循环中没有降解。这项研究有利于探索创新的两相皮克林乳液，包括三个不同的液体组分和它们在液-液萃取过程中的利用。
A novel castor oil/water/ethanol Pickering emulsion, stabilized by magnetic nanoparticles (NPs), was developed to allow on-demand demulsification by an external magnetic field for the extraction of ethanol from aqueous solution using the castor oil. The emulsion was stabilized by Fe3O4-coated cellulose nanocrystals (CNC@Fe3O4) and lignin-coated Fe3O4NPs (lignin@Fe3O4). The stability of the emulsions was investigated at various castor oil to ethanol-water ratios (50/50 and 70/30), various NP concentrations, and ethanol concentrations in the aqueous phase. The magnetically controlled demulsification ability of the emulsions was investigated by using a permanent magnet. The results showed that the 70/30 emulsions were more stable than the 50/50 emulsions for all the ethanol concentrations. Moreover, increasing the NP concentration increased the emulsion stability and hence, 1 w/v% NPs concentration provided the more stable systems. However, all the emulsions were successfully broken by the permanent magnet. Yet, the presence of ethanol improves the ability of the external magnetic field to demulsify these dispersions. Furthermore, the used hybrid NPs were recovered and recycled for three cycles. The recycled NPs were characterized with X-ray diffraction (XRD) and vibrating sample magnetometry (VSM) indicating that they retained their saturation magnetization and crystalline structure, demonstrating their lack of degradation over multiple recycling cycles. This study facilitates the exploration of innovative two-phase Pickering emulsions comprising three distinct liquid components and their utilization in liquid-liquid extraction processes.