Application of Fe<sub>3</sub>O<sub>4</sub> magnetite nanoparticles grafted in silica (SiO<sub>2</sub>) for oil recovery from oil in water emulsions
<p dir="ltr">In this study, an innovative magnetic demulsifier (MD) was prepared by grafting a silica layer onto the surface of the Fe<sub>3</sub>O<sub>4</sub> magnetic nanoparticles (MNPs) using the modified Stober process. The MD was characterized using vari...
محفوظ في:
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| مؤلفون آخرون: | |
| منشور في: |
2021
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إضافة وسم
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| الملخص: | <p dir="ltr">In this study, an innovative magnetic demulsifier (MD) was prepared by grafting a silica layer onto the surface of the Fe<sub>3</sub>O<sub>4</sub> magnetic nanoparticles (MNPs) using the modified Stober process. The MD was characterized using various analytical techniques (XRD, FTIR, TGA, TEM, VSM, etc.) and employed to recover oil from O/W emulsion, which were then regenerated and recycled several times. The effects of magnetic demulsifier dosage (MD<sub>dose</sub>), the concentration of oil (C<sub>oil</sub>), pH, the concentration of the surfactant (C<sub>sur</sub>), and separation time (t<sub>sep</sub>) on the demulsification efficiency (%<sub>hdem</sub>), and the percentage of oil recovered (%R<sub>oil</sub>) were evaluated. An excellent %<sub>hdem</sub> 90% was achieved C<sub>oil</sub> in the range 50 e2000 mg/L. Using an MD<sub>dose</sub> as low as 10 mg/L attained a %<sub>hdem</sub> in the range of 93% - 4.3% for O/W mixtures with C<sub>oil</sub> < 2000 mg/L, which slightly decreased to ~90% for higher concentrations. The reported %R<sub>oil </sub>(p-value <0.05) was >90 ± 0.1 for tests carried out with pH 7 and C<sub>sur </sub>0.1 g/L and declined at higher pH and Csur to % 86.5 due to the increase in emulsion stability. The developed MD exhibited high recyclability at an effective and stable %R<sub>oil</sub> and %<sub>hdem</sub> of ~90% and 86.4% after 9 cycles, respectively. Demulsification process best fits the combined Langmuir-Freundlich (L-F) isotherm with highest adsorption capacity (Q<sub>max</sub>) of 186.0 ± 5 mg<sub>oil</sub>/g<sub>MD</sub> compared to 86.0 ± 5 mg<sub>oil</sub>/g<sub>MD</sub> for Fe<sub>3</sub>O<sub>4</sub>, which is 1.1 folds greater than Q<sub>max</sub> reported in the literature for other demulsifiers.</p><h2>Other Information</h2><p dir="ltr">Published in: Chemosphere<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.chemosphere.2020.129054" target="_blank">https://dx.doi.org/10.1016/j.chemosphere.2020.129054</a></p> |
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