Surface Modification of SiO2-Coated FePt Nanoparticles with Amino Groups

Luong, Nguyen Hoang; Phú, Nguyễn Đăng; Hai, Nguyen Hoang; Thuy, Nguyen Thi Dieu

doi:10.1380/ejssnt.2011.536

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…The shifting of characteristic peak Fe–O–Fe of magnetite (Blue line) from 583.2 to 591.6 cm –1 in the spectrum of SiO 2 @Fe 3 O 4 (red), also indicate the coating of silica shell on the surface of the magnetite NPs. Silica coating on the surface of magnetite NPs is also confirmed from literature. − …”

Section: Resultssupporting

confidence: 65%

Selective Heterogeneous Catalytic Hydrogenation of Ketone (C═O) to Alcohol (OH) by Magnetite Nanoparticles Following Langmuir–Hinshelwood Kinetic Approach

Shah

Balouch

Rajar

et al. 2015

ACS Appl. Mater. Interfaces

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Magnetite nanoparticles were successfully synthesized and effectively employed as heterogeneous catalyst for hydrogenation of ketone moiety to alcohol moiety by NaBH4 under the microwave radiation process. The improvement was achieved in percent recovery of isopropyl alcohol by varying and optimizing reaction time, power of microwave radiations and amount of catalyst. The catalytic study revealed that acetone would be converted into isopropyl alcohol (IPA) with 99.5% yield in short period of reaction time, using 10 μg of magnetite NPs (Fe3O4). It was observed that the catalytic hydrogenation reaction, followed second-order of reaction and the Langmuir-Hinshelwood kinetic mechanism, which elucidated that both reactants get adsorb onto the surface of silica coated magnetite nanocatalyst to react. Consequently, the rate-determining step was the surface reaction of acetone and sodium borohydride. The current study revealed an environment friendly conversion of acetone to IPA on the basis of its fast, efficient, and highly economical method of utilization of microwave irradiation process and easy catalyst recovery.

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Section: Resultssupporting

confidence: 65%

Selective Heterogeneous Catalytic Hydrogenation of Ketone (C═O) to Alcohol (OH) by Magnetite Nanoparticles Following Langmuir–Hinshelwood Kinetic Approach

Shah

Balouch

Rajar

et al. 2015

ACS Appl. Mater. Interfaces

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“…Infrared bands related to Fe-O stretching and bending vibrations should appear between 550 and 400 cm −1 . Considering that the infrared spectrometer did not cover that wavenumber range, only a faint absorption band close to 500 cm −1 related to the Fe-O bonds stretching [34] was observed.…”

Section: Ftir Measurementsmentioning

confidence: 99%

“…All measurements were performed under a limited oxygen supply to subject the composites to the harshest reaction regime, where the general reaction rate could be dictated with dye adsorption on the catalyst surface. The only oxidant came from dissolved oxygen within the liquid; additional oxygen could only be provided by transfer across the surface of the reaction [34]. Photocatalytic degradation of MB could occur under these conditions at reaction rates comparable to those under oxygen-rich conditions [39].…”

Section: Photocatalytic Activity Under Limited O2mentioning

confidence: 99%

Photocatalytic Degradation of Methylene Blue by Magnetic Opal/Fe3O4 Colloidal Crystals under Visible Light Irradiation

Carmona-Carmona,

Mora,

Flores

et al. 2023

Photochem

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In this study, opal–magnetite photocatalysts based on SiO2 artificial opal crystals infiltrated with different concentrations of Fe3O4 nanoparticles (NPs) were synthesized using a combination of lateral infiltration and co-assembly methods. By adjusting the concentration of Fe3O4 NPs in the SiO2 opal crystal, the energy band gap (Eg) was tuned to enable efficient degradation of methylene blue (MB) under visible light (410 nm and 575 nm). The photocatalytic process involved two stages: MB adsorption on the surface due to charge differences in the composite film and subsequent degradation through oxidative radicals on the catalyst’s surface. The developed material exhibited potential for applications in water remediation.

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