Magnetic silica nanomaterials for solid-phase extraction combined with dispersive liquid-liquid microextraction of ultra-trace quantities of plasticizers

Yamini, Yadollah; Faraji, Mohammad; Adeli, Mahnaz

doi:10.1007/s00604-015-1474-z

Cited by 35 publications

(6 citation statements)

References 31 publications

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“…Silica-coated MNPs (SMNPs) were prepared using the sol–gel approach, with some modifications. 27 Briefly, 1 g of Fe 3 O 4 nanoparticles were suspended in a mixture of 100 mL deionized water and 300 mL ethanol by ultrasonication for 10 min. The mixture was transferred to a reactor, and the temperature was raised to 80 °C.…”

Section: Methodsmentioning

confidence: 99%

A one step method for isolation of genomic DNA using multi-amino modified magnetic nanoparticles

Chen²,

Yang

et al. 2021

RSC Adv.

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Section: Methodsmentioning

confidence: 99%

A one step method for isolation of genomic DNA using multi-amino modified magnetic nanoparticles

Chen²,

Yang

et al. 2021

RSC Adv.

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“…Surface modification of the nanoparticles of transient metals oxides (especially Fe) is essential to distribute them evenly in target solution. Moreover, in medical applications of magnetite nanoparticles, surface modification of Fe 3 O 4 nanoparticles is crucial in making them biocompatible 20 , so different agents such as polymeric materials, inorganic materials and surfactants have been used in the researches for surface modification of these nanoparticles 21 – 24 . Several studies have recently reported on the modification of the surface of magnetite nanoparticles and improvement of their properties for various applications, including: collection of spilled oils on the earth’s surface 25 , removal of coomassie brilliant blue-R250 dye (CBB) from aqueous solutions 26 , dye absorption 27 , inhibiting hen egg-white lysozyme (HEWL) fibrillization and destroying mature fibrils 28 .…”

Section: Introductionmentioning

confidence: 99%

Preparation of stable colloidal dispersion of surface modified Fe3O4 nanoparticles for magnetic heating applications

Sabzi Dizajyekan,

Jafari,

Vafaie-Sefti

et al. 2024

Sci Rep

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The effect of surface modification on enhancing the magnetic heating behavior of magnetic nano fluids were investigated, for this purpose Fe3O4 nanoparticles were synthesized using co-precipitation method and surface modification was done using citric acid, ascorbic acid, tetraethyl orthosilicate (TEOS), polyvinyl alcohol (PVA) and polyethylene glycol (PEG). Experimental heating tests using AC magnetic field were done in the frequency of 100 kHz and different magnetic field (H) intensities. Theoretically the specific absorption rate (SAR) in magnetic nano fluids is independent of nanoparticles concentration but the experimental results showed different behavior. The theoretical SAR value @ H = 12kA.m–1 for Nano fluids containing bare Fe3O4 nanoparticles was 11.5 W/g but in experimental tests the obtained value was 9.72 W/g for nano fluid containing 20,000 ppm of dispersed nanoparticles. The experimental SAR calculation was repeated for sample containing 10,000 ppm of nanoparticles and the results showed increase in experimental SAR that is an evidence of nanoparticles agglomeration in higher concentrations. The surface modification has improved the dispersion ability of the nanoparticles. The Ratio of SAR, experimental, 20000ppm to SAR, experimental, 10000ppm was 0.85 for bare Fe3O4 nanoparticles dispersion but in case of surface modified nanoparticles this ratio has increased up to 0.98 that shows lower agglomeration of nanoparticles as a result of surface modification, although on the other hand the surface modification agents were magnetically passive and so it is expected that in constant concentration the SAR for bare Fe3O4 nanoparticles to be higher than this variable for surface modified nanoparticles. At lower concentrations the dispersions containing bare Fe3O4 nanoparticles showed higher SAR values but at higher concentrations the surface modified Fe3O4 nanoparticles showed better results although the active agent amount was lower at them. Finally, it should be noted that the nanoparticles that were surface modified using polymeric agents showed the highest decrease in experimental SAR amounts comparing theoretical results that was because of the large molecules of polymers comparing other implemented surface modification agents.

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“…However, NPMs are easily oxidizable and may lose magnetism. With the coupling of MNPs and GO, the use of centrifugation and filtration processes to separate MNPs-GO and solution matrix are avoided [21][22][23]. Furthermore, the coupled MNPs-GO seeks compensation for the disadvantages of MNPs, favoring the dispersion over GO layer and avoiding the agglomeration [17], which could decrease the specific surface area.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Synthesis Methods to Prepare New Functionalized Adsorbent Materials Based on MNPs–GO Coupling

et al. 2020

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In this work, the synthesis of new adsorbent nanomaterials based on the coupling of magnetic nanoparticles and graphene oxide (MNPs–GO) was addressed. Separately, MNPs and GO have adsorbent properties of great interest, but their use involves certain difficulties. The coupling seeks compensation for their disadvantages, while maintaining their excellent properties. Three different routes to synthesize coupled MNPs–GO were studied and are compared in this work. The three synthesized materials were functionalized with chelating groups: [1,5-bis (di-2-pyridyl) methylene] thiocarbonohydrazide (DPTH) and [1,5-bis(2-pyridyl)3-sulfophenylmethylene] thiocarbonohydrazide (PSTH). The new adsorbent nanomaterials were characterized adequately. Moreover, their capacities of adsorption toward heavy and noble metals were determined, in order to apply them as extractants in magnetic solid-phase extraction to preconcentrate metals in environmental samples. The results showed that one of the routes provided nanomaterials with better adsorbent characteristics and higher yields of functionalization.

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Magnetic silica nanomaterials for solid-phase extraction combined with dispersive liquid-liquid microextraction of ultra-trace quantities of plasticizers

Cited by 35 publications

References 31 publications

A one step method for isolation of genomic DNA using multi-amino modified magnetic nanoparticles

A one step method for isolation of genomic DNA using multi-amino modified magnetic nanoparticles

Preparation of stable colloidal dispersion of surface modified Fe3O4 nanoparticles for magnetic heating applications

Comparative Study of Synthesis Methods to Prepare New Functionalized Adsorbent Materials Based on MNPs–GO Coupling

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