Magnetically separable BiFeO3 nanoparticles with a γ-Fe2O3 parasitic phase: controlled fabrication and enhanced visible-light photocatalytic activity

Guo, Ruochen; Fang, Liang; Dong, Wen; Zheng, Fengang; Shen, Mingrong

doi:10.1039/c1jm13072b

Cited by 88 publications

(36 citation statements)

References 40 publications

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“…3D flowerlike Co 3-x Fe x O 4 ferrite hollow spheres (specific surface area 163 m 2 /g, providing which provided more active sites) were found to be efficient for the catalytic degradation of Methylene Blue in the presence of H 2 O 2 at 80°C (Hao et al, 2013 (Bhukal et al, 2014, pp.150-158). Also, comparing with pure BFO (BiFeO 3 ) nanoparticles, the BFO/γ-Fe 2 O 3 samples exhibited significantly increased visible-light photocatalytic ability towards Rhodamine B (Guo et al, 2011). The formation of a heterojunction structure between the BFO and γ-Fe 2 O 3 phases was proposed to be responsible for the enhanced photocatalytic activity.…”

Section: Structure/property/particle Size Studiesmentioning

confidence: 94%

Mini-review: Ferrite nanoparticles in the catalysis

Kharisov

Dias

Kharissova

2019

Arabian Journal of Chemistry

243

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: 94%

Mini-review: Ferrite nanoparticles in the catalysis

Kharisov

Dias

Kharissova

2019

Arabian Journal of Chemistry

243

118

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“…However, the photocatalytic performance of bare BiFeO 3 is not satisfactory owing to high recombination rate of photogenerated electronhole pairs, and this shortage limits its practical applications in the field of photocatalysis. Therefore, many strategies have been employed to suppress the recombination of photoinduced charges [13][14][15][16][17][18][19] . Among these methods, coupling BiFeO 3 with narrow-bandgap semiconductor of suitable band potential including BiVO 4 , Ag/AgCl, Fe 2 O 3 and Bi 2 Fe 4 O 9 is demonstrated to be an efficient way to promote photogenerated charges migration and separation, and then improve its photocatalytic activity [16][17][18][19] .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Degradation Activity of BiFeO3 Microspheres by Decoration with g-C3N4 Nanoparticles

Yang

Tang

et al. 2018

Mat. Res.

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In this work, the g-C 3 N 4 nanoparticles decorated BiFeO 3 microspheres composites (g-C 3 N 4 / BiFeO 3 ) were successfully synthesized by hydrothermal treatment of g-C 3 N 4 nanoparticles together with BiFeO 3 microspheres. The SEM and HRTEM observation indicate that the C 3 N 4 nanoparticles with size of 30-50 nm are well decorated on the surface of BiFeO 3 microspheres. The photocatalytic activities of the samples are investigated by the degradation of methylene blue (MB) under the irradiation of simulated sunlight. The as-prepared g-C 3 N 4 /BiFeO 3 composites exhibit remarkable enhanced photocatalytic activity compared with bare BiFeO 3 . More importantly, the photocataltic performance of the composites is further confirmed by the degradation of colorless phenol. Furthermore, the favorable catalytic stability of composites is demonstrated through the recycling photocatalytic experiment. The enhanced photocatalytic activity of g-C 3 N 4 /BiFeO 3 composites is mainly attributed to the separation of the photogenerated electron-hole pairs, resulting from the migration of the photoinduced charge between g-C 3 N 4 nanoparticles and BiFeO 3 . A possible photocatalytic mechanism for dye degradation over g-C 3 N 4 /BiFeO 3 composite is proposed based on the active species trapping experiment, revealing that the photogenerated hole (h + ) and hydrogen peroxide (H 2 O 2 ) are regarded as the major active species for the decomposition of dye, while hydroxyl radicals (•OH) plays a minor role in the photocatalytic reaction.

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“…20 Moreover, recent studies give evidences of a very promising nonlinear optical efficiency, 21,22 which was found to be superior to the standard oxide materials previously introduced. Second, bulk BFO is antiferromagnetic but nanoparticles show weak ferromagnetism which was attributed to various possible causes: size effects, 23 extrinsic effects due to cFe 2 O 3 impurities, 24 or oxygen vacancies. 25 It is well-established that magnetic nanoparticles are essential for the biomedical field with key applications such as magnetic separation, Magnetic Resonance Imaging (MRI), or hyperthermia.…”

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confidence: 99%

“…This can be related to the presence of impurities. 24,44 Pure BFO nanoparticles only display weak ferromagnetism, with saturation magnetization of about 1 emu.g À1 , when the particle size is below the period of the spiral spin structure at 62 nm. 23,54 On the other hand, stronger magnetic responses were already reported and traced to iron oxide impurities (it is worth noting that this behavior has already been seen in samples prepared by combustion synthesis).…”

mentioning

confidence: 99%

Nonlinear optical and magnetic properties of BiFeO3 harmonic nanoparticles

Schwung

Rogov

Clarke

et al. 2014

Journal of Applied Physics

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Enhanced magnetic behavior, exchange bias effect, and dielectric property of BiFeO3 incorporated in (BiFeO3)0.50 (Co0.4Zn0.4Cu0.2 Fe2O4)0.5 nanocomposite AIP Advances 4, 037112 (2014) Second Harmonic Generation (SHG) from BiFeO 3 nanocrystals is investigated for the first time to determine their potential as biomarkers for multiphoton imaging. Nanocrystals are produced by an auto-combustion method with 2-amino-2-hydroxymethyl-propane-1,3-diol as a fuel. Stable colloidal suspensions with mean particle diameters in the range 100-120 nm are then obtained after wet-milling and sonication steps. SHG properties are determined using two complementary experimental techniques, Hyper Rayleigh Scattering and nonlinear polarization microscopy. BiFeO 3 shows a very high second harmonic efficiency with an averaged hdi coefficient of 79 6 12 pm/V. From the nonlinear polarization response of individual nanocrystals, relative values of the independent d ij coefficients are also determined and compared with recent theoretical and experimental studies. Additionally, the particles show a moderate magnetic response, which is attributed to c-Fe 2 O 3 impurities. A combination of high nonlinear optical efficiency and magnetic response within the same particle is of great interest for future bio-imaging and diagnostic applications. V C 2014 AIP Publishing LLC.[http://dx

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Magnetically separable BiFeO3 nanoparticles with a γ-Fe2O3 parasitic phase: controlled fabrication and enhanced visible-light photocatalytic activity

Cited by 88 publications

References 40 publications

Mini-review: Ferrite nanoparticles in the catalysis

Mini-review: Ferrite nanoparticles in the catalysis

Enhanced Photocatalytic Degradation Activity of BiFeO3 Microspheres by Decoration with g-C3N4 Nanoparticles

Nonlinear optical and magnetic properties of BiFeO3 harmonic nanoparticles

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