Magnetic iron oxide nanoparticles embedded in SBA-15 silica wall as a green and recoverable catalyst for the oxidation of alcohols and sulfides

Atashin, Hassan; Malakooti, Reihaneh

doi:10.1016/j.jscs.2013.09.007

Cited by 20 publications

(16 citation statements)

References 18 publications

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“…Supported iron oxide NPs have proved to be very active catalysts in the oxidation of alcohols, sulphides and thiols [9,10]. Similarly, surface modified mesoporous silica materials containing magnetic iron oxide NPs are efficient metal adsorbers [11].…”

Section: Introductionmentioning

confidence: 99%

One-step sustainable preparation of superparamagnetic iron oxide nanoparticles supported on mesoporous SiO2

Chamorro

Tenorio

Calvo

et al. 2020

The Journal of Supercritical Fluids

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Superparamagnetic iron oxide nanoparticles (SPIONs) supported on high surface area mesoporous SiO2 are advanced materials of great interest in catalysis, adsorption and biomedicine. Here we present a new process to prepare SPION/SiO2 materials by the impregnation and insitu decomposition of Fe(NO3)3.9H2O on mesoporous SiO2 supports in a 25-50% mol ethanol + CO2 mixture at 523 K and 25.0 MPa. -Fe2O3 nanoparticles (NPs) of average size between 6-9 nm were distributed homogeneously on the supports. NPs deposited into the SBA-15 mesopores but mostly on the external surface of MCM-41. Materials prepared with the highest ethanol content were very homogeneous. Magnetic measurements confirmed the superparamagnetic nature of the materials at room temperature. The process proposed is sustainable and scalable, avoids tedious preparations and the additional high temperature treatment under a controlled atmosphere, as the metal decomposition is performed insitu in the CO2-expanded liquid mixture.

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Section: Introductionmentioning

confidence: 99%

One-step sustainable preparation of superparamagnetic iron oxide nanoparticles supported on mesoporous SiO2

Chamorro

Tenorio

Calvo

et al. 2020

The Journal of Supercritical Fluids

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“…However, right after handling appropriate chemical methods for matrix modification, the idea of multifunctional porous nanosystems turned into reality. Brand new nanocomposites were designed and fabricated, soon finding their niche in catalysis 5 , cryomagnetic refrigeration 6 , engineering (sensors) 7 or environmental industry 8 . However, with current advances in nanoscience, biophysics and medicine, the most promising utilization of such nanocomposites appears in the biomedicine 9 .…”

Section: Introductionmentioning

confidence: 99%

Size and distribution of the iron oxide nanoparticles in SBA-15 nanoporous silica via SANS study

Zeleňáková

Hrubovčák

Kapusta

et al. 2019

Sci Rep

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Structural characteristics of nanocomposite series consisting of iron oxide nanoparticles (NPs) embedded in the regular pores of amorphous silica matrix (SBA-15) were investigated by means of small angle neutron scattering (SANS). By virtue of unique neutron properties, insight into the inner structure and matter organization of this kind of systems was facilitated for the first time. Based on rigorous experimental support, fundamental model describing the neutron scattering intensity distribution was proposed by assuming general composite structural features. Model application to SANS data confirmed the presence of iron oxide NPs in the body of examined matrices, providing additional information on their shape, concentration and size distribution. Scattering superposition principle employed in the model conception allows for tailoring its fundamental characteristics, and renders it a potent and versatile tool for a wide range of applications.

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“…The incorporation/doping of heteroatoms into the open silica framework has received considerable attention because of the need to develop more efficient and more stable materials for applications in catalysis, separation, coating and other fields . In particular, iron‐containing silica materials are remarkable heterogeneous catalysts for various reactions such as oxidation, acylation, alkylation, reduction, Fischer–Tropsch synthesis, polymerization, dehydrogenation and hydroformylation …”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8][9] In particular, iron-containing silica materials are remarkable heterogeneous catalysts for various reactions such as oxidation, acylation, alkylation, reduction, Fischer-Tropsch synthesis, polymerization, dehydrogenation and hydroformylation. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] The main limitation of the hierarchical porous materials synthesized via the techniques reported to date in the scientific literature is that they are obtained usually in the form of a powder or as a film, making it difficult to separate and therefore to reuse them.…”

Section: Introductionmentioning

confidence: 99%

Hard meso/macroporous iron oxide/iron silicate macrospheres obtained by the multi‐templating technique

Mureşan

Pui

Măluțan

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND The aim of this work was to develop a cheap and easy method for the synthesis of porous iron oxide/iron silicate composite materials in the form of spheres to replace their corresponding counterparts in powder form. Macrospheres with diameters in the range 1.2–1.3 mm were prepared by the spray‐gelling technique using the multi‐templating method. Iron nitrate and tetraethyl orthosilicate were used as iron and silica sources respectively. Chitosan played a dual role (pore‐ and shape‐generating agent), while other inexpensive and easily accessible biomaterials including yeast and gelatin were used as pore generators. By this technique can be obtained metallosilicates or metal oxides/metallosilicates containing high amounts of metal incorporated within the silica framework. RESULTS The iron oxide/iron silicate composite beads were characterized by nitrogen sorption, scanning electron microscopy (SEM), energy‐dispersive X‐ray (EDX), Fourier transform infrared (FTIR), Raman, X‐ray diffraction (XRD), diffuse reflectance (DR) ultraviolet (UV)–visible and X‐ray photoelectron spectroscopy (XPS) analyses. Wide angle XRD indicated the presence of iron oxides on the surface of sample. XPS, FTIR, Raman and UV–visible analyses showed that the samples contained both intra‐framework as well as extra‐framework iron species. SEM images indicated that the macrospheres were endowed with large pores. The iron oxide/iron silicate beads exhibited good catalytic activity in the hydroxylation reaction of phenol with hydrogen peroxide. CONCLUSION This synthesis method allowed the obtaining of spherical shaped particles with large pores which exhibited good mechanical, thermal and chemical stability. Owing to their size, hardness and shape, these materials can be easily handled, recovered and reused. © 2019 Society of Chemical Industry

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Magnetic iron oxide nanoparticles embedded in SBA-15 silica wall as a green and recoverable catalyst for the oxidation of alcohols and sulfides

Cited by 20 publications

References 18 publications

One-step sustainable preparation of superparamagnetic iron oxide nanoparticles supported on mesoporous SiO2

One-step sustainable preparation of superparamagnetic iron oxide nanoparticles supported on mesoporous SiO2

Size and distribution of the iron oxide nanoparticles in SBA-15 nanoporous silica via SANS study

Hard meso/macroporous iron oxide/iron silicate macrospheres obtained by the multi‐templating technique

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