Phase and morphology evolution of bismuth ferrites via hydrothermal reaction route

Yang, Xin; Zhāng, Yànfāng; Xu, Gang; Wei, Xiao; Ren, Zhaohui; Shen, Ge; Han, Gaorong

doi:10.1016/j.materresbull.2013.01.032

Cited by 44 publications

(19 citation statements)

References 27 publications

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“…Analysis of absorption edges indicated that ferrites have a photo‐absorption property in the visible region. The band gap can be calculated using the following equation:

α h ν = A {((), italich ν - E_{g})}^{n / 2}

…”

Section: Resultsmentioning

confidence: 99%

Photodegradation of textile dye using magnetically recyclable heterogeneous spinel ferrites

Sharma

Singhal

2014

J of Chemical Tech & Biotech

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BACKGROUND The extensive use of dyes in textile industries leads to discharge of dye effluents into water bodies which causes problem to human and aquatic life. In this regard, magnetic nanospinels having formula MFe2O4 (M = Cu, Zn, Ni and Co) were developed and characterized by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), powder x‐ray diffraction (XRD) and diffuse reflactance spectra (DRS). The activity of all the ferrites as heterogeneous Fenton and photo‐Fenton catalysts was evaluated by degradation of Remazol Black 5 (RB5) which is used in the textile industry to dye cotton. RESULTS The optimum reaction conditions for the degradation reactions were 0.50 g L‐1 ferrite, pH 2.5, H2O2 8 mmol L‐1 and dye 50 mg L‐1. Among the four ferrites CuFe2O4 was found to be best (k = 0.228 min‐1) which might be attributed to coupling between Fe3+/Fe2+ and Cu+/Cu2+ redox pairs thus generating more efficient Fenton reagent. Reusability of all the catalysts after magnetic separation was also tested over four cycles. CONCLUSION All the spinel ferrites had good photodegradation ability and recyclability demonstrating their use to remove organic pollutants from wastewater. © 2014 Society of Chemical Industry

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“…Analysis of absorption edges indicated that ferrites have a photo‐absorption property in the visible region. The band gap can be calculated using the following equation:

α h ν = A {((), italich ν - E_{g})}^{n / 2}

…”

Section: Resultsmentioning

confidence: 99%

Photodegradation of textile dye using magnetically recyclable heterogeneous spinel ferrites

Sharma

Singhal

2014

J of Chemical Tech & Biotech

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“…72-2035 and 37-1493, respectively) ( Fig. 1) [11][12][13]. The characteristic peaks corresponding to the crystallographic planes suggest that the prepared samples consisted of micrometer-size pure phases.…”

Section: Structure Of the As-synthesized Ferritesmentioning

confidence: 95%

Metallic ferrites as flame retardants and smoke suppressants in flexible poly(vinyl chloride)

Han

et al. 2015

J Therm Anal Calorim

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Two metallic ferrites LaFeO 3 and BiFeO 3 were successfully synthesized and compared with ZnFe 2 O 4 used as flame retardants and smoke suppressants for flexible poly(vinyl chloride) (PVC). The flame-retardant and smoke-suppressant properties of flame-retarded PVC were evaluated using the limiting oxygen index, smoke density rating, and cone calorimeter tests. The results indicate that BiFeO 3 is an excellent flame retardant and smoke suppressant for flexible PVC. Under 30 kW m -2 radiation, the peak value of heat release rate of 20 phr PVC/BiFeO 3 was reduced by 44.8 % as compared to neat PVC, and the total smoke produced and average specific extinction area of 20 phr PVC/BiFeO 3 were reduced by 54.8 and 52.3 %, respectively. The char residues of the PVC samples were analyzed by SEM and Raman spectra, which suggested the incorporation of ferrites can induce the formation of char layer. This effect combined with the gaseous phase effect of BiFeO 3 , and hence PVC/BiFeO 3 has the best flameretardant and smoke-suppressant properties.

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“…So, it is very difficult to synthesis single‐phase bismuth ferrite nanomaterials. In order to overcome the problems of multiphase formation, numerous synthesis methods such as, sol‐gel technique, low‐temperature polymer‐assisted hydrothermal method, wet chemical solution method, solution combustion method, coprecipitation, citrate precursor, hydrothermal methods, solid‐state reaction method, and liquid‐phase sintering have been employed to prepare single‐phase BFO nanomaterials. Several efforts have also been carried out to suppress the leakage current density by partial substitution of rare earth (Ho, Nd, La etc) or alkaline metal ions (Ca 2+ , Sr 2+ , and Ba 2+ ) at A‐site (Bi‐site).…”

Section: Introductionmentioning

confidence: 99%

Structural, dielectric and magnetic domains properties of Mn‐doped BiFeO₃ materials

Awasthi

Asokan

Das

2020

Int J Applied Ceramic Tech

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The pure and Mn-doped BiFe 1−x Mn x O 3 (x = 0.00, 0.02, 0.05, 0.10) nanomaterials have been prepared by coprecipitation method. The powder X-ray diffraction pattern analysis shows a structural phase transformation from rhombohedral to orthorhombic, as Mn content in the doped BiFe 1−x Mn x O 3 increases from x = 0.00 to 0.10. The Raman spectrum analysis of BiFe 1−x Mn x O 3 also confirms structural phase transformation. The average crystallite size was calculated using the Scherrer formula and found to decrease from 100 to 60 nm. The surface structure of interconnecting cubic grain turns into spherical grains via petal-shaped grains with increasing the Mn-doping concentration. The value of dielectric constant at the frequency of 1 MHz increases rapidly from 27.2 to 76.8 whereas the tangent loss (tan δ) increases gradually from 0.26 to 0.55 as the Mn-doping concentration increases from x = 0.00 to 0.10. It reveals the enhancement of ferroelectric behavior and suppression of the leakage current density. The drastic change in the phase image contrast of magnetic force micrographs with increasing Mn-doping concentration in BiFe 1−x Mn x O 3 also indicates the improvement of the ferromagnetism. K E Y W O R D S multiferroic, Raman spectroscopy, surface modifications, X-ray methods

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Phase and morphology evolution of bismuth ferrites via hydrothermal reaction route

Cited by 44 publications

References 27 publications

Photodegradation of textile dye using magnetically recyclable heterogeneous spinel ferrites

Photodegradation of textile dye using magnetically recyclable heterogeneous spinel ferrites

Metallic ferrites as flame retardants and smoke suppressants in flexible poly(vinyl chloride)

Structural, dielectric and magnetic domains properties of Mn‐doped BiFeO₃ materials

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Phase and morphology evolution of bismuth ferrites via hydrothermal reaction route

Cited by 44 publications

References 27 publications

Photodegradation of textile dye using magnetically recyclable heterogeneous spinel ferrites

Photodegradation of textile dye using magnetically recyclable heterogeneous spinel ferrites

Metallic ferrites as flame retardants and smoke suppressants in flexible poly(vinyl chloride)

Structural, dielectric and magnetic domains properties of Mn‐doped BiFeO3 materials

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Structural, dielectric and magnetic domains properties of Mn‐doped BiFeO₃ materials