A novel magnetic heterogeneous catalyst oxygen-defective CoFe2O4−x for activating peroxymonosulfate

Wu, Longmin; Yu, Yongbo; Zhang, Qian; Hong, Ji-Hyung; Ji, Wang; She, Yuecheng

doi:10.1016/j.apsusc.2019.03.034

Cited by 99 publications

(17 citation statements)

References 38 publications

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“…To validate the catalytic performance of PANI, we also examine MO removal efficiencies over some common heterogeneous catalysts, including Co 3 O 4 , CoFe 2 O 4 , Co–Fe BPAs, CNTs, and NCNTFs. Thanks to the high reactivity of Co 2+ , Co 3 O 4 , CoFe 2 O 4 , and Co–Fe BPAs are widely accepted as excellent metal-based catalysts for PMS activation. , However, CoFe 2 O 4 presents absolute inferiority as compared with PANI, especially in the initial stage of MO degradation. Compared with CoFe 2 O 4 , Co 3 O 4 and Co–Fe BPAs are more active, and Co–Fe BPAs can even give an MO degradation curve that quite similar to PANI.…”

Section: Resultsmentioning

confidence: 99%

Polyaniline: A New Metal-Free Catalyst for Peroxymonosulfate Activation with Highly Efficient and Durable Removal of Organic Pollutants

Sun

Wang

et al. 2019

Environ. Sci. Technol.

133

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Metal-free heterogeneous catalysts are receiving more and more attention for wastewater remediation by activating peroxymonosulfate (PMS) due to their environmental benign. However, carbon-based materials as the most typical metal-free heterogeneous always suffer from poor durability. Inspired by the fact that a conjugated system may facilitate the electron transfer during PMS activation, we innovatively select polyaniline (PANI) as a new PMS activator and investigate its catalytic performance in detail. It is found that PANI can display better catalytic performance than traditional metal-based catalysts and popular N-doped carbocatalysts in methyl orange (MO) degradation. More importantly, PANI is not only universal for various pollutants degradation but also maintains its catalytic performance in repeated degradation experiments. The stable N sites in the conjugated chains and the oxidation-resistance benzene rings as the building units are considered to be responsible for such an excellent durability. In addition, the influences of some routine factors and actual water backgrounds are comprehensively checked and analyzed. The quenching experiments and electron paramagnetic resonance confirm that MO degradation is achieved through both radical and nonradical pathways, where SO4 •– and 1O2 are primary reactive species. The reaction mechanism is also proposed with the assistance of X-ray photoelectron spectroscopy.

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Section: Resultsmentioning

confidence: 99%

Polyaniline: A New Metal-Free Catalyst for Peroxymonosulfate Activation with Highly Efficient and Durable Removal of Organic Pollutants

Sun

Wang

et al. 2019

Environ. Sci. Technol.

133

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“…It should be noted that the addition of PMS preferentially forms •OH in the absence of surface hydroxyl groups (Eqns (1) and ( 2 • was continuously replenished by the O 2 dissolved in the solution (Eqn (9)). 25 Simultaneously, it has been proposed that the reduction of Co 3+ species by Fe 2+ species was thermodynamically favorable (Eqn (10)), 66 which could further activate PMS to produce SO 4 − • by regenerating Co 2+ species. 67 The generated radicals (SO 4 − •, O 2 − •, and •OH) attacked the RhB molecules and efficiently degraded RhB to intermediates (Eqn (11)).…”

Section: Durability Testmentioning

confidence: 99%

“…23 The CoFe 2 O 4 / PMS system has been utilized for the removal of aqueous organic pollutants such as Acid Orange 7, Methyl Orange, Reactive Brilliant Red X-3B, Methylene Blue, bisphenol A and rhodamine B (RhB). 24,25 However, the aggregation of magnetic CoFe 2 O 4 nanoparticles should be urgently suppressed to expose more active sites for adsorption and catalysis. CoFe 2 O 4 -based composites with controlled compositions and structures have been synthesized to hinder nanoparticle aggregation and bring unexpected cooperative effects.…”

Section: Introductionmentioning

confidence: 99%

Bimetal oxalate‐derived synthesis of laponite‐decorated CoFe₂O₄ porous nanostructures for activation of peroxymonopersulfate towards degradation of rhodamine B

Wei

Song

Liu

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Advanced oxidation processes based on sulfate radical have been widely employed for oxidation degradation of organic contaminants. Catalytic activation of peroxymonopersulfate (PMS) with transition metal oxides holds great promise for the generation of sulfate radical. In this work, laponite-decorated CoFe 2 O 4 porous nanostructures have been prepared through the thermal decomposition of laponite/oxalates, and evaluated as a magnetic catalyst to activate PMS for the oxidation of rhodamine B (RhB).RESULTS: The decoration of porous CoFe 2 O 4 microparticles with laponite was evidenced because of the presence of the vibration mode of Si O (at 1359 cm −1 ) in Fourier transform infrared spectra and the uniform distribution of Si and Mg elements from elemental mapping images. Decorating with laponite also resulted in an increase in amount of surface hydroxyl oxygen species, which facilitated the formation of Co OH complex for PMS activation. Furthermore, the enhanced activation of PMS with laponite-decorated CoFe 2 O 4 resulted in a faster removal (98.04%) of RhB as compared to undecorated CoFe 2 O 4 (79.62%) within 56 min. Meanwhile, the rate constant increased from 0.0288 (CoFe 2 O 4 ) to 0.0679 min −1 (laponite-decorated CoFe 2 O 4 ). The degradation rate of RhB progressively increased with reaction temperature and catalyst dosage. Scavenging and electron paramagnetic resonance tests manifested that the sulfate and superoxide radicals served as the major active species for the oxidation of RhB molecules. CONCLUSION:The above results demonstrated positive effects of laponite on the textural property, surface chemical states and catalytic activity of porous CoFe 2 O 4 microparticles. This study provides an insight into the promising role of laponite as an additive in improving PMS activation.

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“…28 CoFe 2 O 4 has average saturation magnetization, strong anisotropy, and excellent mechanical and chemical stabilities. 29 Together with these inorganic systems, well-suited, lightweight, and innately magnetic species such as pumice ‡ are utilized in MCSs. Another advantage of pumice is its highly porous structure, which is formed when gaseous species are emitted from it.…”

Section: Introductionmentioning

confidence: 99%

“… 28 CoFe 2 O 4 has average saturation magnetization, strong anisotropy, and excellent mechanical and chemical stabilities. 29 Together with these inorganic systems, well-suited, lightweight, and innately magnetic species such as pumice ‡ ‡ An igneous rock. are utilized in MCSs.…”

Section: Introductionmentioning

confidence: 99%

Functionalized hybrid magnetic catalytic systems on micro- and nanoscale utilized in organic synthesis and degradation of dyes

et al. 2022

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A novel magnetic heterogeneous catalyst oxygen-defective CoFe2O4−x for activating peroxymonosulfate

Cited by 99 publications

References 38 publications

Polyaniline: A New Metal-Free Catalyst for Peroxymonosulfate Activation with Highly Efficient and Durable Removal of Organic Pollutants

Polyaniline: A New Metal-Free Catalyst for Peroxymonosulfate Activation with Highly Efficient and Durable Removal of Organic Pollutants

Bimetal oxalate‐derived synthesis of laponite‐decorated CoFe₂O₄ porous nanostructures for activation of peroxymonopersulfate towards degradation of rhodamine B

Functionalized hybrid magnetic catalytic systems on micro- and nanoscale utilized in organic synthesis and degradation of dyes

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A novel magnetic heterogeneous catalyst oxygen-defective CoFe2O4−x for activating peroxymonosulfate

Cited by 99 publications

References 38 publications

Polyaniline: A New Metal-Free Catalyst for Peroxymonosulfate Activation with Highly Efficient and Durable Removal of Organic Pollutants

Polyaniline: A New Metal-Free Catalyst for Peroxymonosulfate Activation with Highly Efficient and Durable Removal of Organic Pollutants

Bimetal oxalate‐derived synthesis of laponite‐decorated CoFe2O4 porous nanostructures for activation of peroxymonopersulfate towards degradation of rhodamine B

Functionalized hybrid magnetic catalytic systems on micro- and nanoscale utilized in organic synthesis and degradation of dyes

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Bimetal oxalate‐derived synthesis of laponite‐decorated CoFe₂O₄ porous nanostructures for activation of peroxymonopersulfate towards degradation of rhodamine B