Synthesis of magnetically separable core@shell structured NiFe2O4@TiO2 nanomaterial and its use for photocatalytic hydrogen production by methanol/water splitting

Kim, Hyun Soo; Kim, Dong-Jin; Kwak, Byeong Sub; Han, Gi Bo; Um, Myeong-Heon; Kang, Misook

doi:10.1016/j.cej.2013.12.046

Cited by 151 publications

(41 citation statements)

References 34 publications

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“…Pure NiFe 2 O 4 exhibits very low photocatalytic activity due to a high recombination rate of the charge carriers and the aggregation of the nanoparticles. However, NiFe 2 O 4 is an attractive semiconductor to couple with other semiconductors or carbon nanomaterials and form nanocomposite photocatalysts with improved activity and, most importantly, could easily be separated using a magnet [167,184,185]. For example, magnetically separable AgBr/NiFe 2 O 4 nanocomposite photocatalyst prepared via a combination of hydrothermal and an ultrasound-assisted precipitation method showed improved photocatalytic performance towards RhB under visible light illumination [186].…”

Section: Magnetite (Fe 3 O 4 )-Based Magnetic Photocatalystsmentioning

confidence: 99%

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Mamba

Mishra

2016

Catalysts

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Organic and inorganic compounds utilised at different stages of various industrial processes are lost into effluent water and eventually find their way into fresh water sources where they cause devastating effects on the ecosystem due to their stability, toxicity, and non-biodegradable nature. Semiconductor photocatalysis has been highlighted as a promising technology for the treatment of water laden with organic, inorganic, and microbial pollutants. However, these semiconductor photocatalysts are applied in powdered form, which makes separation and recycling after treatment extremely difficult. This not only leads to loss of the photocatalyst but also to secondary pollution by the photocatalyst particles. The introduction of various magnetic nanoparticles such as magnetite, maghemite, ferrites, etc. into the photocatalyst matrix has recently become an area of intense research because it allows for the easy separation of the photocatalyst from the treated water using an external magnetic field. Herein, we discuss the recent developments in terms of synthesis and photocatalytic properties of magnetically separable nanocomposites towards water treatment. The influence of the magnetic nanoparticles in the optical properties, charge transfer mechanism, and overall photocatalytic activity is deliberated based on selected results. We conclude the review by providing summary remarks on the successes of magnetic photocatalysts and present some of the future challenges regarding the exploitation of these materials in water treatment.

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Section: Magnetite (Fe 3 O 4 )-Based Magnetic Photocatalystsmentioning

confidence: 99%

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Mamba

Mishra

2016

Catalysts

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“…13 Here, due to the replacement of some Fe 3þ ions by Co 2þ ions in the tetrahedral site, the A 1g band splits into two branches A 1g (1) and A 1g (2). Meanwhile, with increasing the reaction time, an apparent shifting of the peak position of the above Raman modes is observed, especially for the reaction time of 8 h, which implies the variation of the synthetic time leads to lattice defect as well as the redistribution of divalent and trivalent cations in A and B sites.…”

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confidence: 99%

“…have drawn considerable interest due to their easily tunable properties and wide potential applications in magnetic recording media, data storage, microwave devices, sensors, and adsorbent. 2 It is known that the physical and chemical properties of ferrite nanoparticles are very sensitive to the preparation method or synthetic route. Therefore, the synthesis of the ferrite nanoparticles has recently become an important research hotspot of magnetic nanomaterials and is drawing increasing attention in the area of basic research as well as in technological applications.…”

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confidence: 99%

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Microstructure and magnetic properties of MFe2O4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method

Wang

Ding

Zhao

et al. 2015

Journal of Applied Physics

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Three kinds of spinel ferrite nanocrystals, MFe2O4 (M = Co, Ni, and Mn), are synthesized using colloid mill and hydrothermal method. During the synthesis process, a rapid mixing and reduction of cations with sodium borohydride (NaBH4) take place in a colloid mill then through a hydrothermal reaction, a slow oxidation and structural transformation of the spinel ferrite nanocrystals occur. The phase purity and crystal lattice parameters are estimated by X-ray diffraction studies. Scanning electron microscopy and transmission electron microscopy images show the morphology and particle size of the as-synthesized ferrite nanocrystals. Raman spectrum reveals active phonon modes at room temperature, and a shifting of the modes implies cation redistribution in the tetrahedral and octahedral sites. Magnetic measurements show that all the obtained samples exhibit higher saturation magnetization (Ms). Meanwhile, experiments demonstrate that the hydrothermal reaction time has significant effects on microstructure, morphologies, and magnetic properties of the as-synthesized ferrite nanocrystals.

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“…Spinel ferrite is a good candidate material for use in supports for the photocatalytic degradation of dyes or organic compounds [16,17]. A core@shell NiFe 2 O 4 /TiO 2 photocatalyst has been developed for use in the production of hydrogen in aqueous systems [18,19].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of magnetically recoverable ferrite (MFe2O4, M Co, Ni and Fe)-supported TiO2 photocatalysts for decolorization of methylene blue

Shih

Chen

et al. 2015

Catalysis Communications

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Synthesis of magnetically separable core@shell structured NiFe2O4@TiO2 nanomaterial and its use for photocatalytic hydrogen production by methanol/water splitting

Cited by 151 publications

References 34 publications

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Microstructure and magnetic properties of MFe2O4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method

Synthesis of magnetically recoverable ferrite (MFe2O4, M Co, Ni and Fe)-supported TiO2 photocatalysts for decolorization of methylene blue

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