Synthesis and magnetic properties of monodisperse Fe3O4 nanoparticles with controlled sizes

Salado, Javier; Insausti, Maite; Lezama, Luís; Rojo, Teófilo

doi:10.1016/j.jnoncrysol.2008.05.063

Cited by 33 publications

(23 citation statements)

References 4 publications

(4 reference statements)

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“…Slight changes were observed with a saturation magnetization ( M s ) of 34.079 and 35.151 emu/g for Fe 3 O 4 before and after, respectively, five runs. Owing to the smaller particle size and the surface‐related effects such as surface disorder, the M s value of the Fe 3 O 4 MNPs was lower than that reported for bulk magnetite (92 emu/g) , but it could still be easily separated and recovered from solution by an external magnetic field, as shown in the inset photograph of Figure c.…”

Section: Resultsmentioning

confidence: 69%

Degradation of sulfamethazine antibiotics in Fenton‐like system using Fe₃O₄ magnetic nanoparticles as catalyst

Bai

Yang

Wang

2017

Env Prog and Sustain Energy

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In this study, Fe3O4 magnetic nanoparticles (MNPs) were synthesized, characterized and used for the degradation of sulfamethazine (SMT). The results showed that Fe3O4 MNPs were efficient and reusable heterogeneous catalytic for SMT degradation in a Fenton‐like system. More than 80% of the SMT was degraded under optimal conditions: initial pH of 3.0, 20 mM of H2O2, Fe3O4 MNPs dose of 1.0 g/L, and initial concentration of SMT 20 mg/L (initial total organic carbon: 10.4 mg/L). Among the parameters that affect SMT degradation, initial pH is of crucial importance to degrade SMT in the Fenton‐like system. A possible pathway of SMT degradation was proposed based on detected products in the solution. The Fe3O4 MNPs exhibited high stability and reusability. The SMT removal remained at 80% over five runs with the catalyst. Slight agglomeration and dissolution of Fe3O4 MNPs after reactions were observed by X‐ray diffraction and field emission scanning electron microscopy analysis. The SMT removal and mineralization could be enhanced using Fe3O4 MNPs/powder‐activated carbon (PAC) composite as catalyst. The removal efficiency of SMT and TOC increased to 94.7% and 80.8% in optimal conditions, respectively, in Fenton‐like system catalyzed by Fe3O4 MNPs/PAC composite. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 1743–1753, 2017

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Section: Resultsmentioning

confidence: 69%

Degradation of sulfamethazine antibiotics in Fenton‐like system using Fe₃O₄ magnetic nanoparticles as catalyst

Bai

Yang

Wang

2017

Env Prog and Sustain Energy

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“…3. The saturation magnetization values of used catalyst significantly increased from 9.18 to 20.44 emu/g compared with new Fe 3 O 4 /MWCNTs, which may be due to the enlarged particle size or the surfacerelated effects (Salado et al 2008). The catalyst can be easily separated and recovered from solution by an external magnetic field.…”

Section: Characterization Of Catalystmentioning

confidence: 98%

Fe3O4/multi-walled carbon nanotubes as an efficient catalyst for catalytic ozonation of p-hydroxybenzoic acid

Bai

Yang

Wang

2015

Int. J. Environ. Sci. Technol.

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Fe 3 O 4 /multi-walled carbon nanotubes were prepared, characterized and used as a nanocatalyst for ozonation of p-hydroxybenzoic acid. The stability and reusability of the catalyst was evaluated. Characterization techniques including X-ray diffraction, Fourier transform infrared absorption spectroscopy, scanning electron microscope, high-resolution transmission electron microscopy and physical property measurement were used to analyze the reason for the decrease in catalyst activity. The addition of t-butanol and bicarbonate were used to explore the different process between hydroxyl radicals and ozone. The experimental results showed that the catalytic ozonation could significantly increase the degradation and mineralization of p-hydroxybenzoic acid. The initial pH value was a crucial factor influencing ozone decomposition and the surface property of catalyst or organic pollutant. The degradation of p-hydroxybenzoic acid increased by 32 % in catalyzed ozonation compared to single ozonation after 5 min reaction with unadjusted pH (about 5.4). In batch experiments, the removal efficiency of p-hydroxybenzoic acid and total organic carbon decreased 36.1 and 6.8 % after six run times. Bicarbonate significantly inhibited the mineralization of p-HBA, but it had almost no influence on the catalytic degradation of p-hydroxybenzoic acid. A possible pathway for p-hydroxybenzoic acid degradation was tentatively proposed.

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“…Magnetite may be synthetically prepared by several experimental techniques, such as precipitation from mixtures of ferric and ferrous ions in an alkaline medium, oxidation of ferrous ion from ferrous hydroxide solutions, interaction of ferrous ions with hydrated iron oxide solutions or decomposition of organic precursors. Although chemical coprecipitation methods are widely used to the synthesis of ferrites nanoparticles [2,3,[6][7][8][9][10], others important experimental techniques also deserve attention, such as hydrothermal [11,12], sonochemical [13,14], sol-gel [15,16], solvothermal [17][18][19], flow injection in tubular nanoreactors and electrochemical [20], aerosol [21] and precipitation from water-in-oil microemulsions [22].…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the synthesis of poly(vinyl pivalate)-based magnetic nanocomposites through suspension polymerization process

Araujo

Ferreira

Segura

et al. 2015

European Polymer Journal

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Synthesis and magnetic properties of monodisperse Fe3O4 nanoparticles with controlled sizes

Cited by 33 publications

References 4 publications

Degradation of sulfamethazine antibiotics in Fenton‐like system using Fe₃O₄ magnetic nanoparticles as catalyst

Degradation of sulfamethazine antibiotics in Fenton‐like system using Fe₃O₄ magnetic nanoparticles as catalyst

Fe3O4/multi-walled carbon nanotubes as an efficient catalyst for catalytic ozonation of p-hydroxybenzoic acid

An experimental study on the synthesis of poly(vinyl pivalate)-based magnetic nanocomposites through suspension polymerization process

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Synthesis and magnetic properties of monodisperse Fe3O4 nanoparticles with controlled sizes

Cited by 33 publications

References 4 publications

Degradation of sulfamethazine antibiotics in Fenton‐like system using Fe3O4 magnetic nanoparticles as catalyst

Degradation of sulfamethazine antibiotics in Fenton‐like system using Fe3O4 magnetic nanoparticles as catalyst

Fe3O4/multi-walled carbon nanotubes as an efficient catalyst for catalytic ozonation of p-hydroxybenzoic acid

An experimental study on the synthesis of poly(vinyl pivalate)-based magnetic nanocomposites through suspension polymerization process

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Degradation of sulfamethazine antibiotics in Fenton‐like system using Fe₃O₄ magnetic nanoparticles as catalyst

Degradation of sulfamethazine antibiotics in Fenton‐like system using Fe₃O₄ magnetic nanoparticles as catalyst