Natural illite-based ultrafine cobalt oxide with abundant oxygen-vacancies for highly efficient Fenton-like catalysis

Dong, Xiongbo; Duan, Xiaodi; Sun, Zhiming; Zhang, Xiangwei; Li, Chunquan; Yang, Shanshan; Ren, Bangxing; Zheng, Shuilin; Dionysiou, Dionysios D.

doi:10.1016/j.apcatb.2019.118214

Cited by 228 publications

(67 citation statements)

References 57 publications

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“…Artificial creation of oxygen vacancies effectively modulates the electronic structure of metal oxides, including CuO. This kind of modulation has been proven efficient for boosting catalytic performance [ 121 ]. Yu et al verified that the incorporation of copper into zinc ferrite catalyst could harvest rich oxygen vacancies.…”

Section: Evolution Of 1 O 2 mentioning

confidence: 99%

Evolution of Singlet Oxygen by Activating Peroxydisulfate and Peroxymonosulfate: A Review

Xiao

Faheem

et al. 2021

IJERPH

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Advanced oxidation processes (AOPs) based on peroxydisulfate (PDS) or peroxymonosulfate (PMS) activation have attracted much research attention in the last decade for the degradation of recalcitrant organic contaminants. Sulfate (SO4•−) and hydroxyl (•OH) radicals are most frequently generated from catalytic PDS/PMS decomposition by thermal, base, irradiation, transition metals and carbon materials. In addition, increasingly more recent studies have reported the involvement of singlet oxygen (1O2) during PDS/PMS-based AOPs. Typically, 1O2 can be produced either along with SO4•− and •OH or discovered as the dominant reactive oxygen species (ROSs) for pollutants degradation. This paper reviews recent advances in 1O2 generation during PDS/PMS activation. First, it introduces the basic chemistry of 1O2, its oxidation properties and detection methodologies. Furthermore, it elaborates different activation strategies/techniques, including homogeneous and heterogeneous systems, and discusses the possible reaction mechanisms to give an overview of the principle of 1O2 production by activating PDS/PMS. Moreover, although 1O2 has shown promising features such as high degradation selectivity and anti-interference capability, its production pathways and mechanisms remain controversial in the present literatures. Therefore, this study identifies the research gaps and proposes future perspectives in the aspects of novel catalysts and related mechanisms.

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Section: Evolution Of 1 O 2 mentioning

confidence: 99%

Evolution of Singlet Oxygen by Activating Peroxydisulfate and Peroxymonosulfate: A Review

Xiao

Faheem

et al. 2021

IJERPH

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“…5a and 5b). 8 . In addition, the electron density difference proves the electrons transfer from PMS to Co single atom active center in both CoN 4 and CoSi 1 N 3 moieties (Fig.…”

Section: Radical (Somentioning

confidence: 99%

“…Although cobalt ion (Co 2+ ) has been regarded as the most e cient species for homogeneous PMS activation, the potential environmental toxicity and carcinogenicity of residual Co 2+ severely impede its global scale application 7 . Cobalt oxides such as Co 3 O 4 can address above issues, but the relatively low activation e ciency (turnover frequencies (TOF) per Co atom basis) compared to Co 2+ remains challenging [7][8][9][10] . In recent years, Co single atom catalysts (SACs), as one of the most emerging kinds of heterogeneous catalysts, possess special electronic structure, utmost Co atom utilization e ciency, and uniformly isolated Co active sites [11][12][13][14][15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

Natural mineral modulated single atom catalyst for effective water treatment

Dong¹,

Chen²,

Tang³

et al. 2021

Preprint

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Single atom catalysts (SACs) have been growing as an emerging “hot” topic in environmental remediation. Their performance can be rationally optimized via modulating spatial coordination configuration and porous structure of SACs, which is still challenging. Herein, a novel Si, N co-coordinated cobalt SACs (p-CoSi1N3@D) with 3D freestanding architecture was tailored via employing natural mineral (diatomite) as Si source and porous template. Theoretical calculations and experimental analysis reveal that Si substitution dramatically decreases electronegativity of CoN4 moieties and thus accelerates interaction and electron transfer between peroxymonosulfate and Co single atom center. Moreover, p-CoSi1N3@D inherits hierarchically porous architecture of diatomite, providing more accessible cobalt sites and open diffusion channels for peroxymonosulfate and contaminants in water treatment applications. Thanks to optimal coordination structure and porous architecture, p-CoSi1N3@D can serve as highly active catalyst toward peroxymonosulfate activation, with a turn-over frequency of 299.8 min− 1 for bisphenol A degradation, surpassing those of catalysts with transition metal SACs or oxides in disclosed literature. This work provides a novel vision for development of SACs towards wastewater reclamation.

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“…New findings in this article determine that oxygen vacancies in the surface of MgO are also highly active sites to catalyze PMS. Dong et al found that the abundant oxygen vacancies not only increased the reducibility of the catalyst, but also facilitated the electron transfer from PMS and organic molecules to the catalyst [55]. Therefore, in the proposed mechanism, based on the abovementioned results and previous reports, we refer to the literature and speculate that oxygen vacancy in the MgO surface acts as mediator, which temporarily receives oxygen atoms of hydroxyl groups on HSO 5 − , and then promotes the breakage of peroxide bands and accelerates the combination of broken oxygen atoms, to form singlet oxygen [56], as shown in Figure 9.…”

Section: Probable Catalytic Pathmentioning

confidence: 99%

High-Efficiency Catalysis of Peroxymonosulfate by MgO for the Degradation of Organic Pollutants

et al. 2019

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In the study, magnesium oxide (MgO) was used to catalyze peroxymonosulfate (PMS) for the degradation of organic pollutants for the first time. According to the single-factor experiment results, it was determined that MgO could efficiently catalyze PMS to degrade organic matters in a wide range of pH values. Based on radical quenching experiments and electron spinning resonance spectra, singlet oxygen was identified to be the crucial reactive species. Importantly, the oxygen vacancy on the surface of MgO was determined as the key active site, which accelerated the decomposition of PMS to produce singlet oxygen. This study provides an interesting insight into the novel and ignored catalyst of MgO for the highly efficient activation of PMS, which will greatly benefit the Fenton-like catalytic degradation of organic wastewater.

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Natural illite-based ultrafine cobalt oxide with abundant oxygen-vacancies for highly efficient Fenton-like catalysis

Cited by 228 publications

References 57 publications

Evolution of Singlet Oxygen by Activating Peroxydisulfate and Peroxymonosulfate: A Review

Evolution of Singlet Oxygen by Activating Peroxydisulfate and Peroxymonosulfate: A Review

Natural mineral modulated single atom catalyst for effective water treatment

High-Efficiency Catalysis of Peroxymonosulfate by MgO for the Degradation of Organic Pollutants

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