Excellent performance of mesoporous Co3O4/MnO2 nanoparticles in heterogeneous activation of peroxymonosulfate for phenol degradation in aqueous solutions

Liang, Hanwen; Sun, Hongqi; Patel, Archana; Shukla, Pradeep; Zhu, Zhonghua; Wang, Shaobin

doi:10.1016/j.apcatb.2012.09.001

Cited by 245 publications

(73 citation statements)

References 38 publications

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“…For PMS self-oxidation test without the presence of a catalyst, less than 10% of phenol was removed after 180 min, revealing that PMS itself could not be effectively activated by the ambient environment to produce reactive species for significant phenol degradation. For catalytic reactions with the presence of both catalyst and PMS, a general trend could be observed that, with the Previous studies have shown that a first-order kinetic model could well simulate phenol decomposition in Co and Mn based catalytic reactions using PMS as an oxidant [31][32][33][34][35][36]. On the basis of these studies, a first-order kinetic model (Eq.…”

Section: Catalytic Oxidation Of Phenolmentioning

confidence: 88%

“…Concentration variations of the intermediates for chemical and photocatalytic degradation displayed a similar trend. For all of three degradation pathways, 4-hydroxybenzoic acid was much more abundant than p-benzoquinone and 1,2-dihydroxybenzne, suggesting that phenol was majorly attacked in the para-position and oxidized into carboxylic acids [35].…”

Section: Catalytic Oxidation Of Phenolmentioning

confidence: 99%

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Photochemical degradation of phenol solutions on Co3O4 nanorods with sulfate radicals

et al. 2015

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Section: Catalytic Oxidation Of Phenolmentioning

confidence: 88%

Section: Catalytic Oxidation Of Phenolmentioning

confidence: 99%

Photochemical degradation of phenol solutions on Co3O4 nanorods with sulfate radicals

et al. 2015

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“…Further increasing the PMS concentration did not increase the degradation efficiency but resulted in a slight inhibition perhaps due to the self-quenching of SO 4 •− by excess PMS. 34 Meanwhile, neutral or alkalescent initial pH conditions exhibit a slightly superior 4-CP removal performance than acidic conditions ( Figure S7b) in this reaction process. Figure S7c shows the effect of initial 4-CP concentrations on the reaction.…”

Section: ■ Introductionmentioning

confidence: 99%

Spatial Confinement of a Co₃O₄ Catalyst in Hollow Metal–Organic Frameworks as a Nanoreactor for Improved Degradation of Organic Pollutants

Zeng

Zhang

Wang

et al. 2015

Environ. Sci. Technol.

451

137

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ABSTRACT:We here first proposed a yolk−shell Co 3 O 4 @ metal−organic frameworks (MOFs) nanoreactor via a facile method to accommodate sulfate radical-based advanced oxidation processes (SR-AOPs) into its interior cavity. The mesoporous and adsorptive MOFs shells allow the rapid diffusion of reactant molecules to the encapsulated Co 3 O 4 active sites, and the confined high instantaneous concentration of reactants in the local void space is anticipated to facilitate the SR-AOPs. As a proof of concept, the nanoreactor was fully characterized and applied for catalytic degradation of 4-chlorophenol (4-CP) in the presence of peroxymonosulfate (PMS). The enhancement of SR-AOPs in the nanoreactor is demonstrated by the result that degradation efficiency of 4-CP reached almost 100% within 60 min by using the yolk−shell Co 3 O 4 @MOFs catalysts as compared to only 59.6% under the same conditions for bare Co 3 O 4 NPs. Furthermore, the applicability of this nanoreactor used in SR-AOPs was systematically investigated in terms of effect of reaction parameters and identification of intermediates and primary radical as well as mineralization of the reaction and stability of the composite. The findings of this study elucidated a new opportunity for improved environmental remediation.

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“…[8][9][10]. Sulfate radicals (SO 4 •− ) produced from PMS are believed to possess a higher oxidation potential (2.5-3.1 V) than hydroxyl radicals ( • OH, 2.7 V), then they not only present better oxidation towards phenol degradation, but are flexible to a broad range of pH solutions [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of nitrogen-, boron-, and phosphorus-doping or codoping on metal-free graphene catalysis

et al. 2015

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Please cite this article in press as: X. Duan, et al., Effects of nitrogen-, boron-, and phosphorus-doping or codoping on metal-free graphene catalysis, Catal. Today (2014), http://dx. a b s t r a c tGraphene-based materials have been demonstrated as excellent alternatives to traditional metal-based catalysts in environmental remediation. The metal-free nature of the nanocarbons can completely prevent toxic metal leaching and the associated secondary contamination. In this study, nitrogen doped graphene (NG) at a doping level of 6.54 at.% was prepared at mild conditions. Moreover, B-and P-doping or codoping with N in graphene were also achieved by a simple route. The modified graphene can efficiently activate peroxymonosulfate (PMS) to produce sulfate radicals to oxidize phenol solutions. Kinetic studies indicated that initial phenol concentration, PMS dosage, and temperature presented significant influences on the degradation rates. Electron paramagnetic resonance (EPR) analysis provided further insights into the evolution of active radicals during the activation of PMS and SO 4•− was believed to be the primary radicals in the oxidation reactions. This study demonstrated a metal-free material for green catalysis in environmental remediation.

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Excellent performance of mesoporous Co3O4/MnO2 nanoparticles in heterogeneous activation of peroxymonosulfate for phenol degradation in aqueous solutions

Cited by 245 publications

References 38 publications

Photochemical degradation of phenol solutions on Co3O4 nanorods with sulfate radicals

Photochemical degradation of phenol solutions on Co3O4 nanorods with sulfate radicals

Spatial Confinement of a Co₃O₄ Catalyst in Hollow Metal–Organic Frameworks as a Nanoreactor for Improved Degradation of Organic Pollutants

Effects of nitrogen-, boron-, and phosphorus-doping or codoping on metal-free graphene catalysis

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Excellent performance of mesoporous Co3O4/MnO2 nanoparticles in heterogeneous activation of peroxymonosulfate for phenol degradation in aqueous solutions

Cited by 245 publications

References 38 publications

Photochemical degradation of phenol solutions on Co3O4 nanorods with sulfate radicals

Photochemical degradation of phenol solutions on Co3O4 nanorods with sulfate radicals

Spatial Confinement of a Co3O4 Catalyst in Hollow Metal–Organic Frameworks as a Nanoreactor for Improved Degradation of Organic Pollutants

Effects of nitrogen-, boron-, and phosphorus-doping or codoping on metal-free graphene catalysis

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Spatial Confinement of a Co₃O₄ Catalyst in Hollow Metal–Organic Frameworks as a Nanoreactor for Improved Degradation of Organic Pollutants