Co3O4 nanocrystals/3D nitrogen-doped graphene aerogel: A synergistic hybrid for peroxymonosulfate activation toward the degradation of organic pollutants

Yuan, Ruixia; Hu, Lin; Yu, Peng; Wang, Zhaohui; Wang, Huaiyuan; Fang, Jingyun

doi:10.1016/j.chemosphere.2018.07.065

Cited by 91 publications

(26 citation statements)

References 62 publications

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“…As shown in Figure S9, <16% of AO7 removal could be achieved when the solution pH < 7, while the removal efficiency increased to 80% at pH of 10 over 30 min reaction. This result was consistent with previous reports that PMS could be activated by bases,,, and both base and SP‐50 catalyst contributed synergistically for efficient PMS activation. The k value of PMS/AO7 systems could be ranked as: k =2×10 −4 min −1 (pH=3) <6×10 −4 min −1 (pH=5) <0.005 min −1 (pH=7) <0.011 min −1 (pH=9) <0.039 min −1 (pH=10).…”

Section: Resultssupporting

confidence: 93%

“…Unfortunately, most of these designs either still existed as powder forms or have shown limited success in tuning the Co 3 O 4 active sites in a more accessible manner. Researchers also attempted to immobilize Co 3 O 4 into 3D macroscopic supports ( e. g ., carbon aerogel, monolithic graphene, and nickel foam) as alternatives to the powder‐type catalyst. However, the relatively sophisticated preparation protocols ( e. g ., hydrothermal and impregnation), expensive additives and hosts ( e. g ., graphene or nickel foam), harsh conditions ( e. g ., high temperature annealing), and prolonged reaction time ( e. g ., 24 h for hydrothermal reaction) call for more facile and affordable designs.…”

Section: Introductionmentioning

confidence: 99%

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Engineering Reusable Sponge of Cobalt Heterostructures for Highly Efficient Organic Pollutants Degradation via Peroxymonosulfate Activation

et al. 2019

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The rational 3D design of affordable cobalt heterostructures with tunable catalytic properties and water phase functionality is highly desirable for advanced oxidation applications. Herein, we demonstrate a new and scalable approach based on thermal-induced phase separation chemistry that allows controllable in situ growth of cobalt oxide (Co 3 O 4 ) nanoflowers onto a self-standing polymer sponge. Detailed characterization revealed that the Co 3 O 4 nanoflowers were uniformly and tightly attached on a mesoporous polymeric network with a surface area of 230.0 m 2 /g and excellent mechanical stability. The catalytic performance of the sponge-like catalyst was evaluated by degradation of model organic compounds (i. e., acid orange 7, AO7) under various operational conditions. The results indicate that complete color removal of AO7 can be achieved in < 2 min, with a > 84% TOC mineralization and negligible cobalt leaching under optimal conditions. The SP-50/PMS system could also effectively remove a broad range of compounds like antibiotic tetracycline, acid orange 52 (typical fluorescent azo-dye), and rhodamine B (a typical basic dye). Time-resolved electron paramagnetic resonance (EPR) data revealed that SO 4 * À and OH * À were the primary oxidative species. Overall results exemplified the advantages of highperformance sponge catalyst for the remediation of organic pollutants from water environment.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Engineering Reusable Sponge of Cobalt Heterostructures for Highly Efficient Organic Pollutants Degradation via Peroxymonosulfate Activation

et al. 2019

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“…Dyes are commonly found organic pollutants in wastewater. Though dyes have a wide range of applications in various fields, such as textiles, food, paper, leather, paints, pharmaceuticals and cosmetic industries, some dyes can show toxic effects, including carcinogenic and mutagenic effects . The colloidal matter along with colors and oily scum in dyes increases the turbidity, and gives the water a bad appearance and foul smell.…”

Section: Introductionmentioning

confidence: 99%

“…Advanced oxidation processes (AOPs) play a crucial role in the removal of such pollutants from water. AOPs typically involve in situ generation of highly potent chemical oxidants, such as hydroxyl radical (•OH) species that can convert pollutants into mineral end‐products, yielding CO 2 and inorganic ions . Dyes are commonly found organic pollutants in wastewater.…”

Section: Introductionmentioning

confidence: 99%

Highly dispersed Mn₂O₃−Co₃O₄ nanostructures on carbon matrix as heterogeneous Fenton‐like catalyst

Hazarika

Talukdar

Sudarsanam

et al. 2020

Applied Organom Chemis

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This work reports the synthesis of various carbon (Vulcan XC‐72 R) supported metal oxide nanostructures, such as Mn2O3, Co3O4 and Mn2O3−Co3O4 as heterogeneous Fenton‐like catalysts for the degradation of organic dye pollutants, namely Rhodamine B (RB) and Congo Red (CR) in wastewater. The activity results showed that the bimetallic Mn2O3−Co3O4/C catalyst exhibits much higher activity than the monometallic Mn2O3/C and Co3O4/C catalysts for the degradation of both RB and CR pollutants, due to the synergistic properties induced by the Mn−Co and/or Mn (Co)−support interactions. The degradation efficiency of RB and CR was considerably increased with an increase of reaction temperature from 25 to 45°C. Importantly, the bimetallic Mn2O3−Co3O4/C catalyst could maintain its catalytic activity up to five successive cycles, revealing its catalytic durability for wastewater purification. The structure–activity correlations demonstrated a probable mechanism for the degradation of organic dye pollutants in wastewater, involving •OH radical as well as Mn2+/Mn3+ or Co2+/Co3+ redox couple of the Mn2O3−Co3O4/C catalyst.

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“…In recent years, advanced oxidation processes (AOPs) by means of generation of sulfate radical (SO 4 ●− ) have been an important technology to remove recalcitrant organic constituents in wastewater . The SO 4 ●− radicals can be generated by photolysis, thermolysis, radiation and catalytic activation of peroxymonosulfate (PMS) or persulfate. However, thermolysis, photolysis and radiation need a high‐energy input, and the recycling of homogeneous transition‐metal ions such as Co 2+ and Cu 2+ is difficult.…”

Section: Introductionmentioning

confidence: 99%

Formation of CaCO₃ deposits on OMS‐2 surface to synergistically promote peroxymonosulfate activation and organic dyes degradation

Zou

Wang

et al. 2019

Applied Organom Chemis

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The development of green and efficient catalysts for peroxymonosulfate (PMS) activation and organic pollutants degradation has received widespread attention. In this study, the hybrid CaCO 3 /OMS-2 catalysts were prepared by a simple precipitation approach and characterized by X-ray powder diffraction, N 2 adsorption-desorption, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and cyclic voltammetry. It was found that deposition of CaCO 3 on OMS-2 surface can weaken the Mn-O bond by formation of Ca-O-Mn bond. The interactions between CaCO 3 and OMS-2 significantly enhanced Acid Orange 7 degradation in the presence of PMS with a pseudo-first-order kinetic constant of 0.21 min −1 , which was much higher than those of OMS-2 (0.026 min −1 ) and CaCO 3 (0.021 min −1 ). The CaCO 3 / OMS catalysts were also much more efficient than other reported OMS-2 hybrid catalysts, and could be performed over a wide solution pH and for other organic dyes degradation. Sulfate and hydroxyl radicals were formed from the oxidation of low valent manganese species by PMS as the active species in the system. This study can provide a simple method for the design of efficient manganese-based hybrids for wastewater remediation via PMS activation.

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Co3O4 nanocrystals/3D nitrogen-doped graphene aerogel: A synergistic hybrid for peroxymonosulfate activation toward the degradation of organic pollutants

Cited by 91 publications

References 62 publications

Engineering Reusable Sponge of Cobalt Heterostructures for Highly Efficient Organic Pollutants Degradation via Peroxymonosulfate Activation

Engineering Reusable Sponge of Cobalt Heterostructures for Highly Efficient Organic Pollutants Degradation via Peroxymonosulfate Activation

Highly dispersed Mn₂O₃−Co₃O₄ nanostructures on carbon matrix as heterogeneous Fenton‐like catalyst

Formation of CaCO₃ deposits on OMS‐2 surface to synergistically promote peroxymonosulfate activation and organic dyes degradation

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Co3O4 nanocrystals/3D nitrogen-doped graphene aerogel: A synergistic hybrid for peroxymonosulfate activation toward the degradation of organic pollutants

Cited by 91 publications

References 62 publications

Engineering Reusable Sponge of Cobalt Heterostructures for Highly Efficient Organic Pollutants Degradation via Peroxymonosulfate Activation

Engineering Reusable Sponge of Cobalt Heterostructures for Highly Efficient Organic Pollutants Degradation via Peroxymonosulfate Activation

Highly dispersed Mn2O3−Co3O4 nanostructures on carbon matrix as heterogeneous Fenton‐like catalyst

Formation of CaCO3 deposits on OMS‐2 surface to synergistically promote peroxymonosulfate activation and organic dyes degradation

Contact Info

Product

Resources

About

Highly dispersed Mn₂O₃−Co₃O₄ nanostructures on carbon matrix as heterogeneous Fenton‐like catalyst

Formation of CaCO₃ deposits on OMS‐2 surface to synergistically promote peroxymonosulfate activation and organic dyes degradation