Nanostructured ferrites: Structural analysis and catalytic activity

Albuquerque, Adriana Silva de; Tolentino, Marcus V.C.; Ardisson, José D.; Moura, Flávia C.C.; Mendonça, Renato de; Macedo, W. A. A.

doi:10.1016/j.ceramint.2011.10.071

Cited by 151 publications

(62 citation statements)

References 37 publications

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“…On their basis, several interesting observations have been made. Thus, 3-10 nm Co, Cu, and Ni spinel ferrites evaluated by the decomposition of H 2 O 2 and by the oxidation of methylene blue, monitored via UV-vis spectrophotometry (Albuquerque et al, 2012). The presence of Co 2+ is a crucial factor required to achieve a systematic efficiency of the catalyst in the H 2 O 2 decomposition.…”

Section: Structure/property/particle Size Studiesmentioning

confidence: 99%

Mini-review: Ferrite nanoparticles in the catalysis

Kharisov

Dias

Kharissova

2019

Arabian Journal of Chemistry

279

118

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Recent applications of ferrite nanoparticles as catalysts in organic processes are reviewed. Catalytic applications include the use of mainly cobalt, nickel, copper, and zinc ferrites, as well as their mixed-metal combinations with Cr, Cd, Mn and sometimes some lanthanides. Core-shell nanostructures with silica and titania are also used without loss of magnetic properties. The ferrite nanomaterials are obtained mainly by wet-chemical sol-gel or co-precipitation methods, more rarely by sonochemical technique, mechanical high-energy ball milling, spark plasma sintering, microwave heating or hydrothermal route. Catalytic processes with application of ferrite nanoparticles include decomposition (in particular photocatalytic), reactions of dehydrogenation, oxidation, alkylation, C-C coupling, among other processes. Ferrite nano catalysts can be easily recovered from reaction systems and reused up to several runs almost without loss of catalytic activity.

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Section: Structure/property/particle Size Studiesmentioning

confidence: 99%

Mini-review: Ferrite nanoparticles in the catalysis

Kharisov

Dias

Kharissova

2019

Arabian Journal of Chemistry

279

118

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“…Generally, a high specific surface area has a favorable effect on the activity for catalysis. The observed higher efficiency of CuFe 2 O 4 -MHM catalyst in this oxidation reaction can be attributed to the high dispersity and large surface area provides more active sites for catalytic reaction [31,46]. High specific surface area of CuFe 2 O 4 -MHM was useful to catalytic activity via enhancing the adsorption of benzylic alcohol, which is the determining step in the catalytic reaction [47].…”

Section: Catalytic Oxidation Of Benzylic Alcoholsmentioning

confidence: 92%

“…Moreover, the divalent cations (Cu 2? ) play a vital role in the H 2 O 2 decompositions, where the finally produced O 2 would greatly benefit for the oxidation of benzyl alcohol [31,46]. Yan et al [30] have reported the oxidation of benzyl alcohol over CuFe 2 O 4 catalyst using H 2 O 2 oxidant with 57.30 % conversion and 89.50 % selectivity.…”

Section: Catalytic Oxidation Of Benzylic Alcoholsmentioning

confidence: 98%

Hibiscus rosa-sinensis Leaf Extracted Green Methods, Magneto-Optical and Catalytic Properties of Spinel CuFe2O4 Nano- and Microstructures

Manikandan

Durka²,

Antony

2015

J Inorg Organomet Polym

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Spinel CuFe 2 O 4 nano-and microstructures were synthesized by a simple, economical and eco-friendly microwave heating (MHM) and modified sol-gel methods (SGM) using metal nitrates and Hibiscus rosa-sinensis leaf extracted solution, instead of toxic inorganic/organic catalyst, template and surfactant. Powder XRD, FT-IR, EDX and SAED results were confirmed that the as-synthesized products have a single-phase spinel structure with high crystallinity and without the presence of any other secondary phase impurities. The morphology of the samples was revealed by HR-SEM and HR-TEM techniques show that the MHM and SGM products consist of nano-and microstructures, respectively, and their possible formation mechanisms were also proposed. The optical band gap (E g ) was measured using Kubelka-Munk model and it shows higher value (2.35 eV) for CuFe 2 O 4 -MHM than CuFe 2 O 4 -SGM (2.18 eV), due to the smaller particle size of CuFe 2 O 4 -MHM. The magnetic property of the samples showed a ferromagnetic behavior and the magnetization (M s ) value of CuFe 2 O 4 -MHM is higher i.e. 61.13 emu/g than CuFe 2 O 4 -SGM (57.25 emu/g). Both the samples were successfully tested as catalysts for the conversion of benzylic alcohols to respective carbonyls using H 2 O 2 (as oxidant) and acetonitrile (as a solvent) catalytic system. It was found that the CuFe 2 O 4 -MHM catalyst show best performance of conversion of aromatic alcohols into aldehydes than that of CuFe 2 O 4 -SGM. Spinel CuFe 2 O 4 catalyst is magnetically recyclable and could be reused with no significant loss in catalytic activity as proved for five consecutive cycles.

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“…Although the regeneration of Fe 2+ is not clear, the formation of·OOH has been proposed following the reactions [27]:…”

Section: Optimization Of the Experimental Parametersmentioning

confidence: 99%

Comparison of ferrite nanoparticles obtained electrochemically for catalytical reduction of hydrogen peroxide

Jaime-González

Mazarío

Menéndez

et al. 2015

J Solid State Electrochem

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Ferrites of iron, cobalt, and nickel were used as a non-enzymatic sensor for detection of hydrogen peroxide. Xray diffraction (XRD) and transmission electron microscopy revealed that the nanoparticles obtained by electrochemical route and varying the parameters synthesis show similar size of around 20 nm and a relation metal/iron equal to 1/2. The effect of pH, temperature, amount of nanoparticles, and potential has been studied to obtain the best sensor properties in terms of sensitivity and linear response. The mechanism has been attributed to the oxidation of Fe 2+ , Co 2+ , and Ni 2+ in the octahedral position of the spinel that enhances the catalytic reduction of hydrogen peroxide. The best sensor has been obtained with magnetite (iron ferrite) with a detection limit of 7.3×10 −6 M and a sensitivity of 4.0×10 −4 μA/M. The magnetite was also applied to determine hydrogen peroxide in commercial contact lens cleaner Novoxy® with satisfactory results.

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Nanostructured ferrites: Structural analysis and catalytic activity

Cited by 151 publications

References 37 publications

Mini-review: Ferrite nanoparticles in the catalysis

Mini-review: Ferrite nanoparticles in the catalysis

Hibiscus rosa-sinensis Leaf Extracted Green Methods, Magneto-Optical and Catalytic Properties of Spinel CuFe2O4 Nano- and Microstructures

Comparison of ferrite nanoparticles obtained electrochemically for catalytical reduction of hydrogen peroxide

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