Facile preparation of Fe3O4@AgBr–ZnO nanocomposites as novel magnetically separable visible-light-driven photocatalysts

Shekofteh-Gohari, Maryam; Habibi‐Yangjeh, Aziz

doi:10.1016/j.ceramint.2014.09.081

Cited by 71 publications

(35 citation statements)

References 37 publications

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“…Significantly higher [145] towards model pollutants such as RhB, phenol, MB, and MO. All of the nanocomposite photocatalysts showed good photocatalytic properties, which can be credited to efficient charge separation and improved visible light absorption as a result of the heterojunctions formed between ZnO and the co-catalysts.…”

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

confidence: 99%

“…Moreover, it was shown that despite the formation of the composite photocatalysts, the presence of Fe 3 O 4 nanoparticles ensured that the photocatalysts still retained sufficient magnetic response to allow for efficient separation using an external magnetic field. Obviously, the magnetisation saturation of Fe 3 O 4 decreased sharply upon the formation of the nanocomposites due to their interaction and coverage by the non-magnetic components of the photocatalysts [141][142][143][144][145] 4 , respectively, are excited, and electrons are promoted to the conduction band, while the holes remain in the valence band. Subsequently, the electrons transfer to the conduction band of ZnO where they react with adsorbed oxygen to form the radical species (superoxide and hydroxyl radicals).…”

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

confidence: 99%

“…Meanwhile, the SPR-generated holes in Ag could react with water to form the hydroxyl radicals and together with the superoxide radicals are responsible for pollutant degradation [139]. Yan et al photocatalysts [141][142][143][144][145]. Under visible light irradiation, ZnO remains inactive and only the cocatalyst with a narrow band gap can be excited.…”

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

confidence: 99%

“…Habibi-Yangjeh's group has recently prepared and investigated the visible light photocatalytic properties of various magnetic nanocomposites-based on Fe3O4 and ZnO such as ZnO/AgI/Fe3O4 [141], ZnO/AgBr/Fe3O4/Ag3VO4 [142], ZnO/Ag3VO4/Fe3O4 [143], Fe3O4/ZnO/AgCl [144], and Fe3O4/AgBr-ZnO [145] towards model pollutants such as RhB, phenol, MB, and MO. All of the nanocomposite photocatalysts showed good photocatalytic properties, which can be credited to efficient charge separation and improved visible light absorption as a result of the heterojunctions formed between ZnO and the co-catalysts.…”

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

confidence: 99%

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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%

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

confidence: 99%

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

confidence: 99%

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

confidence: 99%

See 2 more Smart Citations

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

Mamba

Mishra

2016

Catalysts

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“…[23][24][25] The resulting heterostructure interface was used to cage photoinduced electrons and consequently separate generated electron-hole pairs. [26] Additionally, n-n junctions heterostructures such as the ones found in structures of silver phosphate/ iron oxide (Ag3PO4/ Fe2O3), [27] silver vanadate/ zinc oxide (Ag3VO4/ ZnO), [28] or zinc oxide/ silver bromide/ iron oxide/ silver vanadate (ZnO/ AgBr/ Fe3O4/ Ag3VO4) [29] have recently been used to promote efficient separation of the charge carriers and generate high efficiency photocatalysis systems based on delayed electron-hole recombination effects. Further, it was also showed that the large surface area of graphene (GO) for instance, [30] its zero bandgap, [31] excellent electrical conductivity and ability to enhance electron transport, [32] its exceptional transparency, [33] and good chemical stability, [34] could lead to its integration as a promoter of photocatalytic reactions in heterostructures.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Hybrid nanocomposites with enhanced visible light photocatalytic ability for next generation of clean energy systems

Dong

Eldawud

Wagner

et al. 2016

Applied Catalysis A: General

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2 Graphical abstract3 Highlights -Propose to dvance the next generation of heterostructures with high photocatalytic activity -Rely on facile wet chemistry and photoreduction-based synthesis to design and fabricate platinum loaded tungsten trioxide (WO3) nanoparticles/ graphene heterostructures -Evaluated heterostructure morphologies, chemical and physical properties, and their efficiency for stable photocatalysis of model system -Unraveled the fundamental mechanisms, properties and processes that allowed for increased performance, reliability, and competitiveness of such heterostructures -Photocatalysis at such user-formed heterointerfaces related to the available area for reaction and the electron-hole pair recombination rate, all under visible light.4 AbstractHeterogenous photocatalysis is widely used for waste-water treatment and degradation of pollutants and promises to advance the science of alternative materials with visible photo-excitations abilities. However, there are still fundamental material properties and processes that need to be understood in order to increase user-tailored catalytic systems' performance and efficiency, while ensuring their optimized reactivities and large-scale development and implementation.Herein we developed graphene-based hybrid composites to be used as efficient nanocatalysts with increased ability to absorb visible light, that retain high corrosionresistance properties when used in solution, and provide energy levels that match their reduction and oxidation half-reactions. Using both photo-deposition and photoreduction methods, we first created platinum/tungsten trioxide conjugates with physico-chemical characteristics investigated by microscopical and spectroscopical analyses, and further decorated such conjugates onto graphene surfaces to create the hybrids. Our results demonstrate that the synthesized hybrids can degrade a model azo dye and further, show that graphene plays an important role in delaying electron transfer at its interface, with such effect being exploited for possible integration in the next generation of clean energy systems.

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ZnO-based heterostructures as photocatalysts for hydrogen generation and depollution: a review

et al. 2022

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Facile preparation of Fe3O4@AgBr–ZnO nanocomposites as novel magnetically separable visible-light-driven photocatalysts

Cited by 71 publications

References 37 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

Hybrid nanocomposites with enhanced visible light photocatalytic ability for next generation of clean energy systems

ZnO-based heterostructures as photocatalysts for hydrogen generation and depollution: a review

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