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Preparation of Hydrophobic Octadecylphosphonic Acid-Coated Magnetite Nanoparticles for the Demulsification of n-Hexane-in-Water Nanoemulsions.

ABSTRACT: To design more environmentally friendly, economical, and efficient demulsifiers for oily wastewater treatment, hydrophobic octadecylphosphonic acid (ODPA)-modified Fe₃O₄ nanoparticles (referred to as Fe₃O₄@ODPA) were prepared by condensation of hydroxyl groups between ODPA and Fe₃O₄ nanoparticles using the co-precipitation method. The prepared magnetite nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscope (SEM), Fourier transform infrared (FTIR) spectroscopy, and thermogravimetric/differential thermogravimetric (TG/DTG) analysis. The water contact angles (θ_W) of Fe₃O₄@ODPA nanoparticles were more than 120°, indicating hydrophobic nature, and the diameter of the obtained spherical-shaped magnetite nanoparticles was 12-15 nm. The ODPA coating amount (A_O) (coating weight per gram Fe₃O₄) and specific surface area (S_O) of Fe₃O₄@ODPA were 0.124-0.144 g·g^-1 and 78.65-91.01 m²·g^-1, respectively. To evaluate the demulsification ability, stability, and reusability, the magnetite nanoparticles were used to demulsify an n-hexane-in-water nanoemulsion. The effects of the magnetite nanoparticle dosage (C_S), pH value of nanoemulsion, and NaCl or CaCl₂ electrolytes on the demulsification efficiency (R_O) were investigated. The R_O of Fe₃O₄@ODPA samples was found to be higher than that of bare Fe₃O₄ samples (S0, ST, and SN) under all C_S values. With the increase in C_S, the R_O of Fe₃O₄@ODPA samples initially increased and then approached equilibrium value at Cs = 80.0 g·L^-1. A maximum R_O of ~93% was achieved at C_S = 100.0 g·L^-1 for the Fe₃O₄@ODPA sample S2. The pH and two electrolytes had a minor effect on R_O. The Fe₃O₄@ODPA nanoparticles maintained high R_O even after being reused for demulsification 11 times. This indicates that the hydrophobic Fe₃O₄@ODPA samples can be used as an effective magnetite demulsifer for oil-in-water nanoemulsions.

SUBMITTER: Liang J

PROVIDER: S-EPMC10419870 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature

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Preparation of Hydrophobic Octadecylphosphonic Acid-Coated Magnetite Nanoparticles for the Demulsification of n-Hexane-in-Water Nanoemulsions.

Liang Jiling J Han Tingting T Wang Wenwu W Zhang Lunqiu L Zhang Yan Y

Materials (Basel, Switzerland) 20230731 15

To design more environmentally friendly, economical, and efficient demulsifiers for oily wastewater treatment, hydrophobic octadecylphosphonic acid (ODPA)-modified Fe3O4 nanoparticles (referred to as Fe3O4@ODPA) were prepared by condensation of hydroxyl groups between ODPA and Fe3O4 nanoparticles using the co-precipitation method. The prepared magnetite nanoparticles were characterized by X-ray diffraction (XRD), transmission elec ...[more]

PMID: 37570070

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Project description:INTRODUCTION: Expansion of efficacious theranostic systems is of pivotal significance for medicine and human healthcare. Magnetic nanoparticles (MNPs) are known as drug delivery system and magnetic resonance imaging (MRI) contrast agent. MNPs as drug carriers have attracted significant attention because of the delivery of drugs loaded onto MNPs to solid tumors, maintaining them in the target site by an external electromagnetic field, and subsequently releasing drugs in a controlled manner. On the other hand, it is believed that MNPs possess high potential as MRI contrast agents. The aim of this work was to payload curcumin into dextran coated MNPs and investigate their potential as theranostic systems for controlled drug delivery and MRI imaging. METHODS: MNPs were synthesized as a core and coated with dextran as polymeric shell to provide steric stabilization. Curcumin as anticancer drug was selected to be loaded into NPs. To characterize the synthesized NPs, various techniques (e.g., DLS, FESEM, FT-IR, XRD, and VSM) were utilized. In vitro drug release of curcumin was evaluated at 37˚C at the pH value of 5.4 and 7.4.The feasibility of employment of dextran coated MNPs as MRI contrast agents were also studied. RESULTS: Formulations prepared from dextran coated MNPs showed high loading (13%) and encapsulation efficiency (95%). In vitro release study performed in the phosphate-buffered saline (PBS, pH= 7.4, 5.4) revealed that the dextran coated MNPs possess sustained release behavior at least for 4 days with the high extent of drug release in acidic media. Vibrating sample magnetometer (VSM) analysis proved the superparamagnetic properties of the dextran coated MNPs with relatively high-magnetization value indicating that they were sufficiently sensitive to external magnetic fields as magnetic drug carriers. Furthermore, dextran coated MNPs exhibited high potential as T2 contrast agents for MRI. CONCLUSION: Based on our findings, we propose the dextran coated MNPs as promising nanosystem for the delivery of various drugs such as curcumin and MRI contrast agent.

Dataset Information

Preparation of Hydrophobic Octadecylphosphonic Acid-Coated Magnetite Nanoparticles for the Demulsification of n-Hexane-in-Water Nanoemulsions.

Publications

Preparation of Hydrophobic Octadecylphosphonic Acid-Coated Magnetite Nanoparticles for the Demulsification of n-Hexane-in-Water Nanoemulsions.

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