A novel biomaterial — Fe3O4:TiO2 core-shell nano particle with magnetic performance and high visible light photocatalytic activity

He, Qiang; Zhang, Zhenxi; Xiong, Jianwen; Xiong, Yi; Xiao, Hua

doi:10.1016/j.optmat.2008.05.011

Cited by 161 publications

(76 citation statements)

References 14 publications

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“…The magnetically supported catalysts are highly Fisli et al 77 convenient for removing catalyst nanoparticles from water using an external magnetic field without the need for a filtration or centrifugation step in the heterogeneous system, and they can be subsequently reused in another cycle (Jiang et al, 2010). The incorporation of magnetic iron oxide into TiO 2 nanoparticles as the photocatalyst for environmental application has been actively developed (He et al, 2008;Tyrpekl et al, 2011). However, the direct contact of two semiconductors between magnetic iron oxide and TiO 2 gives rise to an unfortunate heterojunction, resulting in an increase in electron-hole recombination and photodissolution, which can lead to a weakening of its photocatalytic activity (Alvarez et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Fisli

Ridwan

Krisyuningsih³

et al. 2017

IJTech

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The main problem with the slurry process is the difficulty in recovering the photocatalyst nanoparticle from water following purification. An alternative solution proposed the photocatalyst be immobilized on magnetic carriers, which would allow them to be recollected from the water suspension following treatment using an external magnetic field. Magnetically photocatalyst composites were prepared using simple heteroagglomeration by applying attractive electrostatic forces between the nanoparticles with an opposite surface charge. The Fe 3 O 4 /SiO 2 /TiO 2 photocatalysts were synthesized in an aqueous slurry solution containing Fe 3 O 4 /SiO 2 and TiO 2 nanoparticles under pH 5 conditions. Meanwhile, Fe 3 O 4 /SiO 2 was prepared by a simple procedure via a coprecipitation of iron(II) and iron(III) ion mixtures in ammonium hydroxide and was leached by sodium silicate. The synthesized samples were investigated to determine the phase structure, the magnetic properties, and the morphology of the composites by X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and transmission electron microscopy (TEM), respectively. The results indicated that the composites contained anatase and rutile phases and exhibited a superparamagnetic behavior. Fe 3 O 4 /SiO 2 particles, which were of the aggregation spherical form at 20 nm in size, were successfully attached onto the TiO 2 surface. The catalytic activity of Fe 3 O 4 /SiO 2 /TiO 2 composites was evaluated for the degradation of methylene blue under ultraviolet (UV) irradiation. The presence of SiO 2 as a barrier between Fe 3 O 4 and TiO 2 is not only improves the photocatalytic properties but also provides the ability to adsorb the properties on the composite. The Fe 3 O 4 /SiO 2 /TiO 2 (50% containing TiO 2 in composite) were able to eliminate 87.3% of methylene blue in water through the adsorption and photocatalytic processes. This result is slightly below pure TiO 2 , which is able to degrade 96% of methylene blue. The resulting Fe 3 O 4 /SiO 2 /TiO 2 composite exhibited an excellent ability to remove dye from water and it is easily recollected using a magnetic bar from the water. Therefore, they have high potency as an efficient and simple implementation for the dye effluent decolorization of textile waste in slurry reactor processes.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Fisli

Ridwan

Krisyuningsih³

et al. 2017

IJTech

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“…They obtained materials with a range of morphologies from spherical shape to peapod like shape, covering the silica-coated magnetite. The direct coating of magnetite with titania was achieved by He et al 67 using a homogeneous precipitation method, which takes magnetite nanoparticles prepared by coprecipitation, Ti(SO 4 ) 2 and urea as precipitation reagent. Using urea, they controled the slowly release of amonia and then the generation of OH -, and consequently the rate of hydrolysis and condensation of TiO 2 precursor, covering the magnetite nanoparticles homogeneously.…”

Section: Going Beyond Silicamentioning

confidence: 99%

Recent advances in the development of magnetically recoverable metal nanoparticle catalysts

Rossi¹,

Garcia²,

Vono³

2012

J. Braz. Chem. Soc.

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O objetivo deste Account é fornecer uma visão geral de nossas atividades atuais de pesquisa, as quais envolvem a síntese e modificação de nanomateriais superparamagnéticos para aplicação na área de separação magnética e catálise. Primeiramente, uma introdução ao magnetismo e à separação magnética é feita. Em seguida, estratégias sintéticas que têm sido desenvolvidas para gerar nanopartículas superparamagnéticas revestidas esfericamente por sílica e outros óxidos, com destaque a sistemas bem caracterizados e preparados por metodologias que geram amostras de elevada qualidade e que, a princípio, podem ser produzidas em maior escala, são discutidas. Uma série de catalisadores magneticamente recuperáveis preparados em nosso grupo de pesquisa pela combinação única de suportes superparamagnéticos e nanopartículas metálicas é destacada. Este Account é concluído com observações pessoais e perspectivas neste campo de pesquisa.The aim of this Account is to provide an overview of our current research activities on the design and modification of superparamagnetic nanomaterials for application in the field of magnetic separation and catalysis. First, an introduction of magnetism and magnetic separation is done. Then, the synthetic strategies that have been developed for generating superparamagnetic nanoparticles spherically coated by silica and other oxides, with a focus on well characterized systems prepared by methods that generate samples of high quality and easy to scale-up, are discussed. A set of magnetically recoverable catalysts prepared in our research group by the unique combination of superparamagnetic supports and metal nanoparticles is highlighted. This Account is concluded with personal remarks and perspectives on this research field.

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“…Moreover, these materials can be widely applied in photoelectric devices, catalysis, drug delivery, chromatography separation and chemical reactors [7][8][9][10][11][12] . Various synthetic methods were explored to prepare hollow nanomaterials including self-assembly techniques, hydrothermal techniques, template-assisted techniques and chemically induced self-transformation [13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

The Effect of Process Condition on the Structure and Optical Properties of Zn/Fe/Sn/Sb-TiO₂Three Dimensional Particle-Electrode

et al. 2016

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Abstract. In this experiment, photocatalysic material ,which is magnetic, photoluminesce and has superior light absorbing mesoporous, was synthesized by sol-gel method with tetrabutyl titanate zinc acetate stannic chloride antimonic chloride and ferric nitrate as precursors, and tri-blocked copolymer F 127 as the template.Based on the experiment results, when the annealing temperature is at 550 , the annealing time is 120min , the doping amount of Zn is 4.0at% . These produced samples were shown to have superior luminescence and UV-vis light absorbance. When the weight of template was set to 1.5g, the obtained photocatalysic materials, indicated that their porous mainly distributed within 1.2nm to 4.7nm and their specific surface areas were larger than 110m 2 /g, and had excellent absorption properties.

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A novel biomaterial — Fe3O4:TiO2 core-shell nano particle with magnetic performance and high visible light photocatalytic activity

Cited by 161 publications

References 14 publications

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Recent advances in the development of magnetically recoverable metal nanoparticle catalysts

The Effect of Process Condition on the Structure and Optical Properties of Zn/Fe/Sn/Sb-TiO₂Three Dimensional Particle-Electrode

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A novel biomaterial — Fe3O4:TiO2 core-shell nano particle with magnetic performance and high visible light photocatalytic activity

Cited by 161 publications

References 14 publications

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Recent advances in the development of magnetically recoverable metal nanoparticle catalysts

The Effect of Process Condition on the Structure and Optical Properties of Zn/Fe/Sn/Sb-TiO2Three Dimensional Particle-Electrode

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Product

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The Effect of Process Condition on the Structure and Optical Properties of Zn/Fe/Sn/Sb-TiO₂Three Dimensional Particle-Electrode