Magnetic CoFe2O4 nanoparticles supported on titanate nanotubes (CoFe2O4/TNTs) as a novel heterogeneous catalyst for peroxymonosulfate activation and degradation of organic pollutants

Du, Yunchen; Ma, Wenjie; Liu, Pingxin; Zou, Bohua; Ma, Jun

doi:10.1016/j.jhazmat.2016.01.035

Cited by 428 publications

(95 citation statements)

References 41 publications

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“…The average size of CoFe 2 O 4 nanoparticles is around 10 nm, which is much smaller than that of unsupported CoFe 2 O 4 nanoparticles. This phenomenon was also reported by Du et al (Du et al 2016). The better dispersion and smaller size both benefited the contact with reaction substrates and the exposure of active sites.…”

Section: Resultssupporting

confidence: 84%

Synthesis of magnetic CoFe2O4/ordered mesoporous carbon nanocomposites and application in Fenton-like oxidation of rhodamine B

Deng

Chen

Lü

et al. 2017

Environ Sci Pollut Res

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CoFeO/ordered mesoporous carbon (OMC) nanocomposites were synthesized and tested as heterogeneous peroxymonosulfate (PMS) activator for the removal of rhodamine B. Characterization confirmed that CoFeO nanoparticles were tightly bonded to OMC, and the hybrid catalyst possessed high surface area, pore volume, and superparamagnetism. Oxidation experiments demonstrated that CoFeO/OMC nanocomposites displayed favorable catalytic activity in PMS solution and rhodamine B degradation could be well described by pseudo-first-order kinetic model. Sulfate radicals (SO·) were verified as the primary reactive species which was responsible for the decomposition of rhodamine B. The optimum loading ratio of CoFeO and OMC was determined to be 5:1. Under optimum operational condition (catalyst dosage 0.05 g/L, PMS concentration 1.5 mM, pH 7.0, and 25 °C), CoFeO/OMC-activated peroxymonosulfate system could achieve almost complete decolorization of 100 mg/L rhodamine B within 60 min. The enhanced catalytic activity of CoFeO/OMC nanocomposites compared to that of CoFeO nanoparticles could be attributable to the increased adsorption capacity and accelerated redox cycles between Co(III)/Co(II) and Fe(III)/Fe(II).

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Section: Resultssupporting

confidence: 84%

Synthesis of magnetic CoFe2O4/ordered mesoporous carbon nanocomposites and application in Fenton-like oxidation of rhodamine B

Deng

Chen

Lü

et al. 2017

Environ Sci Pollut Res

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“…The iron-based bimetal catalysts such as CoFe 2 O 4 and CuFe 2 O 4 showed high catalytic efficiencies with an increased activity of Fe 2 O 3 but were limited by the narrow applicable pH range of Fe 2+ . 17,18 Moreover, copper and cobalt catalysts have been studied separately, but the combined effect of copper and cobalt in the Fenton reaction has not been studied. 19,20 Thus, we drew our attention on their bimetal suldes.…”

Section: Introductionmentioning

confidence: 99%

Multiwalled carbon nanotube-supported CuCo₂S₄ as a heterogeneous Fenton-like catalyst with enhanced performance

et al. 2017

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In this paper, we prepared CuCo 2 S 4 /MWCNTs as a heterogeneous iron-free bimetal catalyst for the degradation of methylene blue (MB) dye by uniformly synthesizing CuCo 2 S 4 nanoparticles on the surfaces of multiwalled carbon nanotubes (MWCNTs). The homogeneous nanostructure, tuned by MWCNTs, and the efficient electron transfer from CuCo 2 S 4 to MWCNTs resulted in a quite decent catalytic activity, which was superior to that of pristine CuCo 2 S 4 and monometal sulfides. Moreover, CuCo 2 S 4 /MWCNTs maintained a good catalytic performance over a broad pH range of 3 to 12, and exhibited better MB degradation rates under alkaline conditions. Meanwhile, the catalyst was reusable for up to three cycles due to the strong interaction between the nanoparticles and MWCNTs. The results demonstrate that CuCo 2 S 4 /MWCNTs is an improved Fenton catalyst and a promising candidate to substitute iron-based catalysts for the treatment of wastewater containing dyes.

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“…Previous investigations have pointed out that in the cobalt-iron homogeneous and heterogeneous catalytic activation of the peroxymonosulfate reaction, sulfate radical (SO 4 ·− ) and hydroxyl radical (·OH) can always be identified as the main reactive species [45]. To ascertain the main intermediate active species in the three different systems, radical scavenger tests were taken in this study.…”

Section: Reaction Mechanism Studymentioning

confidence: 99%

Cobalt-iron Oxide, Alloy and Nitride: Synthesis, Characterization and Application in Catalytic Peroxymonosulfate Activation for Orange II Degradation

et al. 2017

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Abstract:In meeting the need for environmental remediation in wastewater treatment and the development of popular sulfate-radical-based advanced oxidation processes (SR-AOPs), a series of Co/Fe-based catalysts with confirmed phase structure were prepared through extended soft chemical solution processes followed by atmosphere-dependent calcination. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and 57 Fe Mössbauer spectroscopy were employed to characterize the composition, morphology, crystal structure and chemical state of the prepared catalysts. It was shown that calcination in air, nitrogen and ammonia atmospheres generated Co-Fe catalysts with cobalt ferrite (CoFe 2 O 4 ), Co-Fe alloy and Co-Fe nitride as dominant phases, respectively. The prepared Co/Fe-based catalysts were demonstrated to be highly efficient in activating peroxymonosulfate (PMS) for organic Orange II degradation. The activation efficiency of the different catalysts was found to increase in the order CoFe 2 O 4 < Co-Fe nitride < Co-Fe alloy. Sulfate radical was found to be the primary active intermediate species contributing to the dye degradation for all the participating catalysts. Furthermore, a possible reaction mechanism was proposed for each of the studied catalysts. This study achieves progress in efficient cobalt-iron catalysts using in the field of SR-AOPs, with potential applications in environment remediation.

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Magnetic CoFe2O4 nanoparticles supported on titanate nanotubes (CoFe2O4/TNTs) as a novel heterogeneous catalyst for peroxymonosulfate activation and degradation of organic pollutants

Cited by 428 publications

References 41 publications

Synthesis of magnetic CoFe2O4/ordered mesoporous carbon nanocomposites and application in Fenton-like oxidation of rhodamine B

Synthesis of magnetic CoFe2O4/ordered mesoporous carbon nanocomposites and application in Fenton-like oxidation of rhodamine B

Multiwalled carbon nanotube-supported CuCo₂S₄ as a heterogeneous Fenton-like catalyst with enhanced performance

Cobalt-iron Oxide, Alloy and Nitride: Synthesis, Characterization and Application in Catalytic Peroxymonosulfate Activation for Orange II Degradation

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Magnetic CoFe2O4 nanoparticles supported on titanate nanotubes (CoFe2O4/TNTs) as a novel heterogeneous catalyst for peroxymonosulfate activation and degradation of organic pollutants

Cited by 428 publications

References 41 publications

Synthesis of magnetic CoFe2O4/ordered mesoporous carbon nanocomposites and application in Fenton-like oxidation of rhodamine B

Synthesis of magnetic CoFe2O4/ordered mesoporous carbon nanocomposites and application in Fenton-like oxidation of rhodamine B

Multiwalled carbon nanotube-supported CuCo2S4 as a heterogeneous Fenton-like catalyst with enhanced performance

Cobalt-iron Oxide, Alloy and Nitride: Synthesis, Characterization and Application in Catalytic Peroxymonosulfate Activation for Orange II Degradation

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Multiwalled carbon nanotube-supported CuCo₂S₄ as a heterogeneous Fenton-like catalyst with enhanced performance