Tuning of Persulfate Activation from a Free Radical to a Nonradical Pathway through the Incorporation of Non-Redox Magnesium Oxide

Ali, Jawad; Zhan, Kun; Wang, Haibin; Shahzad, Ajmal; Zeng, Zehua; Wang, Jia; Zhou, Xinquan; Ullah, Habib; Chen, Zhuqi

doi:10.1021/acs.est.9b04696

Cited by 460 publications

(137 citation statements)

References 65 publications

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“…Recent mechanistic studies on the non‐radical activation of PMS propose two popular pathways: the catalyst‐mediated electron transfer by surface complexed substrate/PMS, and the singlet oxygen ( 1 O 2 ). [ 27 ] However, there is a great deal of uncertainty for the identification of non‐radical route because the present characterization protocols are still debatable. [ 28 ] Singlet oxygen can be created from the above Equation () or by self‐decomposition of PMS.…”

Section: Resultsmentioning

confidence: 99%

Cobalt Single Atoms Embedded in Nitrogen‐Doped Graphene for Selective Oxidation of Benzyl Alcohol by Activated Peroxymonosulfate

Zhao

Zhang

et al. 2021

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.202004579.heterogeneous catalysis has received more attention recently due to the merits of easy separation/recycling and achieving green reaction process. [3] Precious metals such as platinum, ruthenium, gold, and palladium are found to afford excellent catalytic activity for the selective oxidation of alcohols, [2a,4] however, their scarcity and high cost hinder the real applications for chemical industry. As an alternative, the catalysts based on earth-abundant transition metals are investigated to activate different oxidants including molecular oxygen, ozone, and liquid peroxides (i.e., hydrogen peroxide and tert-butylhydroperoxide) for oxidative applications. [5] The particle size and dispersion of the metal/ metal oxides play a pivotal role in affecting the catalytic performance. Therefore, much attention has been focused on reducing the particle size and optimizing the coordination between the metals and supports. Graphene based materials are extensively studied as substrate to support highly dispersed metal particles owing to the high surface area and excellent chemical/electrochemical properties. [6] Single-atom catalysts (SACs) consist of individual atoms dispersed on and/or bonded with the surface atoms of an appropriate support with high selectivity, catalytic activity and excellent atomic efficiency. [7] The catalysts with supported

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Section: Resultsmentioning

confidence: 99%

Cobalt Single Atoms Embedded in Nitrogen‐Doped Graphene for Selective Oxidation of Benzyl Alcohol by Activated Peroxymonosulfate

Zhao

Zhang

et al. 2021

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“…•− to 1 O 2 -based non-radical process [124]. The Cu(II)/Cu(III) redox pair no longer acted as the catalytic center, but the incorporation of MgO facilitated the formation of deficient copper [≡Cu(III)-OH] II and the enrichment of extensive ionic PMS.…”

Section: Copper-based Catalystsmentioning

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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“…(2) the active sites of CuCo 2 O 4 had not been completely occupied by PMS, thus, with the increase of PMS, the contact between CuCo 2 O 4 and PMS could be enhanced, producing more radicals to accelerate the ATZ removal. However, when more PMS (.0.2 mM) was added, the self-quenching phenomenon by excessive PMS reported by Shahzad et al (2019) and Jawad et al (2020) did not occur in the study. At the maximum additive amount of PMS, the excessive PMS in Shahzad's study exceeded 2 mM, which was ten times that in the study.…”

Section: Effect Of Cuco 2 O 4 Dosementioning

confidence: 53%

Activation of peroxymonosulfate by CuCo2O4 nano-particles towards long-lasting removal of atrazine

Yin

Yan

et al. 2021

Journal of Water Reuse and Desalination

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The effect of peroxymonosulfate (PMS) activated by nanocrystalline CuCo2O4 (NPS) on removal of atrazine (ATZ) was studied. First, the main experimental parameters were studied, including CuCo2O4 dose, PMS dose, initial pH value, and co-existing ion. The removal of ATZ (>99%) was attained under the optimal conditions (i.e., 150 mg/L CuCo2O4, 0.2 mM PMS, 5 mg/L ATZ, initial pH value of 6.8, and reaction time of 30 min). However, the removal of ATZ only reached 20.9% in the PMS alone system and there was no significant ATZ removal when adding CuCo2O4 alone into the solution, proving the good performance of the CuCo2O4/PMS system. Furthermore, reusability of CuCo2O4 was tested through five consecutive runs. To confirm which main active radicals were responsible in the system, two radical quenching experiments were carried out and electron paramagnetic resonance (EPR) was tested. In addition, the characterization of fresh and reacted CuCo2O4 NPs was tested by SEM, TEM, EDS, XRD, and XPS. Subsequently, based on the characterization of CuCo2O4 NPs and identification of radicals, ≡Cu2+/ ≡ Cu+ and ≡Co3+/ ≡ Co2+ were considered to be the main catalytic species, while the synergistic effect of Cu and Co played a crucial role. Finally, the degradation pathway of ATZ was proposed.

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Tuning of Persulfate Activation from a Free Radical to a Nonradical Pathway through the Incorporation of Non-Redox Magnesium Oxide

Cited by 460 publications

References 65 publications

Cobalt Single Atoms Embedded in Nitrogen‐Doped Graphene for Selective Oxidation of Benzyl Alcohol by Activated Peroxymonosulfate

Cobalt Single Atoms Embedded in Nitrogen‐Doped Graphene for Selective Oxidation of Benzyl Alcohol by Activated Peroxymonosulfate

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

Activation of peroxymonosulfate by CuCo2O4 nano-particles towards long-lasting removal of atrazine

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