High catalytic activity of magnetic CuFe2O4/graphene oxide composite for the degradation of organic dyes under visible light irradiation

Chen, Peng; Xiang, Xing; Xie, Huifang; Sheng, Qi; Qu, Hongxia

doi:10.1016/j.cplett.2016.08.020

Cited by 67 publications

(12 citation statements)

References 18 publications

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“…The facts show that the photocatalyst can degrade both ammonia and RhB in a single-component solution. The degradation for organic pollutants is consistent with the references reported by Qu and Wang [32,33]. In a mixture of ammonia and RhB with the same concentration of ammonia and RhB as that in Figure 6, however, the degradation ratio for ammonia reached 92.6% at 6 h whereas the degradation ratio for RhB decreased to 39.3% as shown in Figure 7.…”

Section: Molecular Recognition and Selective Photocatalysissupporting

confidence: 90%

Molecular-Level Understanding of Selectively Photocatalytic Degradation of Ammonia via Copper Ferrite/N-Doped Graphene Catalyst under Visible Near-Infrared Irradiation

et al. 2018

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Developing photocatalysts with molecular recognition function is very interesting and desired for specific applications in the environmental field. Copper ferrite/N-doped graphene (CuFe 2 O 4 /NG) hybrid catalyst was synthesized and characterized by surface photovoltage spectroscopy, X-ray powder diffraction, transmission electron microscopy, Raman spectroscopy, UV-Vis near-infrared diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The CuFe 2 O 4 /NG catalyst can recognize ammonia from rhodamine B (RhB) in ammonia-RhB mixed solution and selectively degrade ammonia under visible near-infrared irradiation. The degradation ratio for ammonia reached 92.6% at 6 h while the degradation ratio for RhB was only 39.3% in a mixed solution containing 100.0 mg/L NH 3 -N and 50 mg/L RhB. Raman spectra and X-ray photoelectron spectra indicated ammonia adsorbed on CuFe 2 O 4 while RhB was adsorbed on NG. The products of oxidized ammonia were detected by gas chromatography, and results showed that N 2 was formed during photocatalytic oxidization. Mechanism studies showed that photo-generated electrons flow to N-doped graphene following the Z-scheme configuration to reduce O 2 dissolved in solution, while photo-generated holes oxidize directly ammonia to nitrogen gas.to graphene [6], TiO 2 [7], AgBr [8] and Ag 3 PO 4 [9] to fabricate composites for degrading organic pollutants. Wang and co-workers utilized CuFe 2 O 4 as a photocatalyst to selectively degrade methylene blue in the presence of methylene orange, rhodamine B and rhodamine 6G, and the authors attributed the selective degradation to the specific interaction of active sites of catalyst with the methylene blue molecule [10]. To the best of our knowledge, however, the coupling of CuFe 2 O 4 to nitrogen-doped graphene (NG) for the selective photocatalytic oxidization of NH 3 has not been reported.Graphene is a two-dimensional sp2-hybridized carbon material with unique properties such as excellent charge transport, outstanding transparency, huge specific surface area, high mechanical strength and superior thermal conductivity, so it was often used as a co-catalyst [11][12][13][14][15][16][17]. Moreover, molecular tailoring (nitrogen atoms were doped into graphene framework) can module its intrinsic properties to meet the rapidly increasing demand for practical applications in various fields. For example, nitrogen doping can tailor its electrical properties, open a band gap and allow it to show semiconducting properties. As a result, nitrogen doping can significantly improve the catalytic activity toward photocatalytic reactions due to the enhanced electron transportation from semiconductors to NG and the reduced recombination of the photogenerated electron-hole pairs [18][19][20]. In the work, we coupled CuFe 2 O 4 to NG to prepare CuFe 2 O 4 /NG hybrid catalyst, it is expected that the Cu-based hybrid catalyst can recognize ammonia via coordination effect since the formation constant of Cu(NH 3 ) 4 2+ approached 1.1 × 10 13 . This large constant implies...

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Section: Molecular Recognition and Selective Photocatalysissupporting

confidence: 90%

Molecular-Level Understanding of Selectively Photocatalytic Degradation of Ammonia via Copper Ferrite/N-Doped Graphene Catalyst under Visible Near-Infrared Irradiation

et al. 2018

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“…Compared to the homogeneous Fenton catalysts, thanks to the recoverability of heterogeneous Fenton catalysts in the degradation process, those researchers paid more attention on the exploration of heterogeneous catalytic process. Note that polyoxometalates consisted of several metal components such as NiCo 2 O 4 , Copper ferrite (CuFe 2 O 4 ) and ZnAl 2 O 4 have been explored and applied in many catalytic reaction processes as heterogeneous catalysts due to its environmentally compatible, magnetism and superior catalytic activity ,. Meanwhile, because of the both presence of Cu and Fe elements in CuFe 2 O 4 , the CuFe 2 O 4 nanoparticles (NPs) have been widely focused on Fenton reaction.…”

Section: Introductionmentioning

confidence: 99%

Stabilized Pony‐Sized‐CuFe₂O₄/Carbon Nitride Porous Composites with Boosting Fenton‐like Oxidation Activity

Yang

Lin

et al. 2018

ChemistrySelect

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In this study, pony‐sized Copper ferrite (CuFe2O4) nanoparticles were directly obtained and synchronously stabilized on nanoporous carbon nitride (MCN) named as CuFe2O4‐MCN, which emerges interestingly as a magnetically‐recycling heterogeneous Fenton‐like catalyst. The Fourier Transform Infrared, X‐ray diffraction, N2 desorption, X‐ray photoelectron spectroscopy and transmission electron microscopy were seriatim used to characterize these synthesized functional catalysts. These present results demonstrated that CuFe2O4‐MCN afford appreciable physical textural characteristics including well‐defined porous structure, advisable surface area and pore volume. The interaction between CuFe2O4 and MCN and its induced improved dispersion of CuFe2O4 NPs on MCN could be confirmed through XPS, FT‐IR, and TEM evidences. Impressively, the resulted CuFe2O4‐MCN composites exhibited a three times’ catalytic activity (kobs, 0.076 min−1) than that (kobs, 0.026 min−1) of mechanical mixture CuFe2O4‐MCN(M) in 4‐chlorophenol(CP) degradation. CuFe2O4‐MCN porous composites was further evaluated in catalysis according to various controlled parameters, including catalyst loading, H2O2 concentration, catalyst dosage and pH of 4‐CP degradation. At last, the catalytic stability of CuFe2O4‐MCN composites was investigated via magnetic recycling and reusage in next catalytic test. After three successive experimental runs, the porous structure and catalytic activity of CuFe2O4‐MCN catalysts remained constant.

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“…However, the (001) crystal plane of GO was not observed in the XRD patterns of all the BiOBr-G samples, confirming the successful reduction of GO. Furthermore, the typical diffraction peaks of RGO at 2θ = 25.0° and 43.1° were not observed in the XRD patterns of the BiOBr-G nanocomposites, which could be attributed to the relatively low diffraction peak intensity of RGO [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

One-Step Microwave-Assisted Synthesis and Visible-Light Photocatalytic Activity Enhancement of BiOBr/RGO Nanocomposites for Degradation of Methylene Blue

2021

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In this study, bismuth oxybromide/reduced graphene oxide (BiOBr/RGO), i.e. BiOBr-G nanocomposites, were synthesized using a one-step microwave-assisted method. The structure of the synthesized nanocomposites was characterized using Raman spectroscopy, X-ray diffractometry (XRD), photoluminescence (PL) emission spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), and ultraviolet-visible diffuse reflection spectroscopy (DRS). In addition, the ability of the nanocomposite to degrade methylene blue (MB) under visible light irradiation was investigated. The synthesized nanocomposite achieved an MB degradation rate of above 96% within 75 min of continuous visible light irradiation. In addition, the synthesized BiOBr-G nanocomposite exhibited significantly enhanced photocatalytic activity for the degradation of MB. Furthermore, the results revealed that the separation of the photogenerated electron–hole pairs in the BiOBr-G nanocomposite enhanced the ability of the nanocomposite to absorb visible light, thus improving the photocatalytic properties of the nanocomposites. Lastly, the MB photo-degradation mechanism of BiOBr-G was investigated, and the results revealed that the BiOBr-G nanocomposites exhibited good photocatalytic activity.

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High catalytic activity of magnetic CuFe2O4/graphene oxide composite for the degradation of organic dyes under visible light irradiation

Cited by 67 publications

References 18 publications

Molecular-Level Understanding of Selectively Photocatalytic Degradation of Ammonia via Copper Ferrite/N-Doped Graphene Catalyst under Visible Near-Infrared Irradiation

Molecular-Level Understanding of Selectively Photocatalytic Degradation of Ammonia via Copper Ferrite/N-Doped Graphene Catalyst under Visible Near-Infrared Irradiation

Stabilized Pony‐Sized‐CuFe₂O₄/Carbon Nitride Porous Composites with Boosting Fenton‐like Oxidation Activity

One-Step Microwave-Assisted Synthesis and Visible-Light Photocatalytic Activity Enhancement of BiOBr/RGO Nanocomposites for Degradation of Methylene Blue

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High catalytic activity of magnetic CuFe2O4/graphene oxide composite for the degradation of organic dyes under visible light irradiation

Cited by 67 publications

References 18 publications

Molecular-Level Understanding of Selectively Photocatalytic Degradation of Ammonia via Copper Ferrite/N-Doped Graphene Catalyst under Visible Near-Infrared Irradiation

Molecular-Level Understanding of Selectively Photocatalytic Degradation of Ammonia via Copper Ferrite/N-Doped Graphene Catalyst under Visible Near-Infrared Irradiation

Stabilized Pony‐Sized‐CuFe2O4/Carbon Nitride Porous Composites with Boosting Fenton‐like Oxidation Activity

One-Step Microwave-Assisted Synthesis and Visible-Light Photocatalytic Activity Enhancement of BiOBr/RGO Nanocomposites for Degradation of Methylene Blue

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Stabilized Pony‐Sized‐CuFe₂O₄/Carbon Nitride Porous Composites with Boosting Fenton‐like Oxidation Activity