Recyclable magnetic CoFe<sub>2</sub>O<sub>4</sub>/BiOX (X = Cl, Br and I) microflowers for photocatalytic treatment of water contaminated with methyl orange, rhodamine B, methylene blue, and a mixed dye

Choi, Young In; Kim, Young Il; Cho, Dae Won; Kang, Jung-Soo; Leung, K. T.; Sohn, Youngku

doi:10.1039/c5ra17616f

Cited by 55 publications

(19 citation statements)

References 64 publications

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“…Moreover, the nanocomposite photocatalyst showed good stability and recyclability, reaching 93.8% MB degradation in the fifth cycles while still maintaining good magnetic properties [194]. Impressive photocatalytic activity and versatility was observed for CoFe 2 O 4 /BiOX (X = Cl, Br and I) nanocomposites towards the UV and visible light photocatalytic decomposition of MO, RhB, MB, and their mixture (MO + MB + RhB) [195]. Similarly, Xu and coworkers examined the photocatalytic properties and versatile nature of the Ag/AgCl/CoFe 2 O 4 nanocomposite by employing the photocatalyst for the decomposition of MO, bisphenol A (BPA), ciprofloxacin (CIP), and the deactivation of E. coli.…”

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

confidence: 97%

“…In all the CoFe 2 O 4 -incorporating nanocomposites, the enhancement in activity could be ascribed to the formation of a heterojunction between CoFe 2 O 4 and the other semiconductor, which allowed efficient charge separation and formation of the reactive species responsible for pollutant degradation. In addition, the presence of CoFe 2 O 4 endowed the nanocomposite photocatalysts with sufficient magnetic sensitivity for easy separation using an external magnetic field [193][194][195][196] [197], Fe,N-TiO 2 /CoFe 2 O 4 [198], and BiOBr/CoFe 2 O 4 [65].…”

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: 97%

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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“…The calculated E CB and E VB edge positions for Ag 3 PO 4 are 0.49 and 2.85 eV, and for CoFe 2 O 4 are 0.14 and 1.9 eV, respectively, which are close to previous reported values. 58,59 On the basis of the above results and the detection of active species in the photodegradation process, a possible photocatalytic mechanism for dye photodegradation using Ag 3 PO 4 / CoFe 2 O 4 nanocomposite has been proposed as follows and illustrated in Fig. 12.…”

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confidence: 99%

Ag₃PO₄/CoFe₂O₄ magnetic nanocomposite: synthesis, characterization and applications in catalytic reduction of nitrophenols and sunlight-assisted photocatalytic degradation of organic dye pollutants

2017

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) radicals were the main reactive species for dye degradation in the present sonocatalytic system. A proposed mechanism for the enhanced photocatalytic activity is also discussed based on the experimental results. In addition, the catalytic activity of the nanocomposite in the reduction of nitrophenols by using NaBH 4 was evaluated. The results showed that Ag 3 PO 4 /CoFe 2 O 4 exhibited the best performance in the reduction of 4-nitrophenol (4-NP) and 2-nitrophenol (2-NP) and revealed 100% conversion into the corresponding amino derivatives within 24-46 min with rate constant equal to 0.0714 min À1 and 0.0329 min À1, respectively.Moreover, due to the existence of the CoFe 2 O 4 , the Ag 3 PO 4 /CoFe 2 O 4 nanocomposite could be magnetically separated from the reaction mixture and reused without any change in structure.

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“…Thus, photoexcited BiOX can be used as an efficient source of HO·. In calculations for practical application, modest effort has been devoted to load BiOX onto magnetic materials (e.g., spinel [30], Fe 3 O 4 [31], and Fe 2 O 3 [32]). Recently, phosphate was used as photocatalyst support to improve a photocatalyst's resistance against water erosion and hydraulic shearing [33].…”

Section: •−mentioning

confidence: 99%

Treatment of Aqueous Bromate by Superparamagnetic BiOCl-Mediated Advanced Reduction Process

et al. 2017

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Bromate (BrO − 3 ) contamination in drinking water is a growing concern. Advanced reduction processes (ARPs) are reportedly promising in relieving this concern. In this work, UV/superparamagnetic BiOCl (BiOCl loaded onto superparamagnetic hydroxyapatite) assisted with small molecule carboxylic acid (formate, citrate, and acetate), a carboxyl anion radical (CO •−2 )-based ARP, was proposed to eliminate aqueous BrO − 3 . Formate and citrate were found to be ideal CO•− 2 precursor, and the latter was found to be safe for practical use. BrO − 3 (10 µg·L −1 , WHO guideline for drinking water) can be completely degraded within 3 min under oxygen-free conditions. In this process, BrO − 3 degradation was realized by the reduction of CO •− 2 (major role) and formyloxyl radical (minor role) in bulk solution. The formation mechanism of radicals and the transformation pathway of BrO − 3 were proposed based on data on electron paramagnetic resonance monitoring, competitive kinetics, and degradation product analysis. The process provided a sustainable decontamination performance (<5% deterioration for 10 cycles) and appeared to be more resistant to common electron acceptors (O 2 , NO − 3 , and Fe 3+ ) than hydrated electron based-ARPs. Phosphate based-superparamagnetic hydroxyapatite, used to support BiOCl in this work, was believed to be applicable for resolving the recycling problem of other metal-containing catalyst.

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Recyclable magnetic CoFe₂O₄/BiOX (X = Cl, Br and I) microflowers for photocatalytic treatment of water contaminated with methyl orange, rhodamine B, methylene blue, and a mixed dye

Abstract: Magnetic CoFe2O4/BiOX (X = Cl, Br and I) microflowers were tested for methyl orange, rhodamine B, methylene blue, and a mixed dyes.

Cited by 55 publications

References 64 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

Ag₃PO₄/CoFe₂O₄ magnetic nanocomposite: synthesis, characterization and applications in catalytic reduction of nitrophenols and sunlight-assisted photocatalytic degradation of organic dye pollutants

Treatment of Aqueous Bromate by Superparamagnetic BiOCl-Mediated Advanced Reduction Process

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Recyclable magnetic CoFe2O4/BiOX (X = Cl, Br and I) microflowers for photocatalytic treatment of water contaminated with methyl orange, rhodamine B, methylene blue, and a mixed dye

Abstract: Magnetic CoFe2O4/BiOX (X = Cl, Br and I) microflowers were tested for methyl orange, rhodamine B, methylene blue, and a mixed dyes.

Cited by 55 publications

References 64 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

Ag3PO4/CoFe2O4 magnetic nanocomposite: synthesis, characterization and applications in catalytic reduction of nitrophenols and sunlight-assisted photocatalytic degradation of organic dye pollutants

Treatment of Aqueous Bromate by Superparamagnetic BiOCl-Mediated Advanced Reduction Process

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Recyclable magnetic CoFe₂O₄/BiOX (X = Cl, Br and I) microflowers for photocatalytic treatment of water contaminated with methyl orange, rhodamine B, methylene blue, and a mixed dye

Ag₃PO₄/CoFe₂O₄ magnetic nanocomposite: synthesis, characterization and applications in catalytic reduction of nitrophenols and sunlight-assisted photocatalytic degradation of organic dye pollutants