Activation of Peroxydisulfate on Carbon Nanotubes: Electron-Transfer Mechanism

Ren, Wei; Xiong, Liangliang; Yuan, Xuehong; Yu, Ziwei; Zhang, Hui; Duan, Xiaoguang; Wang, Shaobin

doi:10.1021/acs.est.9b05475

Cited by 570 publications

(204 citation statements)

References 62 publications

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“…Based on their structural differences, there are single-walled CNTs (SWCNTs) and multi-walled CNTs (MWCNTs). With excellent adsorptive ability and electron conductivity, CNTs can act as good electron shuttle between organic pollutants and persulfate oxidants [56] so both CNTs-mediated electron transfer from organics to persulfate and 1 O 2 are responsible for a nonradical degradative route [57]. Yun et al explored the role of PDS during its activation with nFe 0 and CNTs [58].…”

Section: Carbon Nanotubes (Cnts)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: Carbon Nanotubes (Cnts)mentioning

confidence: 99%

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

Xiao

Faheem

et al. 2021

IJERPH

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“…[ 5b ] Such direct electron abstraction without radicals for pollutant degradation was preferentially initiated when the catalyst possessed high conductivity and surface affinity toward contaminants and PMS. [ 35 ] To gain insight into this possible catalyst‐mediated non‐radical route for BPA removal, the i – t curve was recorded (Figure 4g). Adding PMS stimulated a significant increase in the current output, which indicated that the electron transfer from CoP@MOF‐2‐C to PMS occurred to produce SO 4 •− .…”

Section: Resultsmentioning

confidence: 99%

Confinement of CoP Nanoparticles in Nitrogen‐Doped Yolk‐Shell Porous Carbon Polyhedron for Ultrafast Catalytic Oxidation

Zhu

Zhao

Fan

et al. 2020

Adv Funct Materials

122

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Catalytic oxidation of toxic organic pollutants in water urgently requires improved efficiency for practical application. Here a wrapping-pyrolysis strategy is exploited to convert CoP nanowires-threaded ZIF-8 into CoP nanoparticlesconfined nitrogen-doped yolk-shell porous carbon polyhedra, featuring highdensity active sites, and high adsorbability, dispersibility and conductivity (4-High). The nanoreactor efficiently activates peroxymonosulfate for bisphenol A (BPA) degradation over a wide pH range and in saline solutions. The apparent kinetic rate constant (18.96 min −1) is the highest reported to date and exceeds those of reported catalysts by 1-2 orders of magnitude. Experimental and theoretical evidence reveals that the catalysis occurs at the Co 4 P 4 @graphitic nitrogen-doped graphene site to produce surface-bound SO 4 •− and induce direct electron abstraction for BPA degradation. The high catalytic activity is attributed to the unique yolk-shell structure which concentrates catalytic and adsorptive sites within a confined space, as well as to the porous carbon polyhedron with high dispersibility and conductivity for fast mass and electron transport. Moreover, a fluidized-bed catalytic unit is constructed and enables continuous zero discharge of BPA and easy nanocatalyst recycling. This work will guide "4-High" catalyst design to improve future deep water purification technology.

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“…Similarly, as shown in Fig. 12c and d [34,49]. The active species resulting in the degradation of organic pollutants in the PMS&CNTs/MgO system was further studied.…”

Section: Detection Of Reactive Oxygen Speciesmentioning

confidence: 88%

A novel carbon nanotube–magnesium oxide composite with excellent recyclability to efficiently activate peroxymonosulfate for Rhodamine B degradation

et al. 2020

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There is an urgent need for an eco-friendly and efficient route to treat the organic pollutants in wastewater. Therefore, we report a facile synthesis of carbon nanotube-magnesium oxide composite (CNTs/MgO) which can efficiently activate peroxymonosulfate (PMS) to degrade Rhodamine B (RhB). Fabricated CNTs/MgO was characterized by XRD, FTIR, SEM, TEM, BET, XPS, and Raman. The results showed that the carbon nanotubes uniformly entangled on the MgO whiskers and linked to the MgO by Mg-C and CO bonds. The effects of temperature, pH value, CNTs/MgO dosage, PMS dosage and the ratio of MgO/CNTs on degradation of RhB were conducted to determine the activation performance of CNTs/MgO. The catalytic degradation process was carried out in a wide pH range of 3-9, and 100% of RhB was degraded in 20 min under optimized conditions. Moreover, the efficient degradation performance was attributed to singlet oxygen generated in the PMS&CNTs/MgO system. The excellent activation properties of CNTs/MgO was derived from the enhanced electron transport performance and chemical bonding between MgO and CNTs. In addition, this work provides an innovative design for the development of novel PMS catalysts without transition metal components.

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Activation of Peroxydisulfate on Carbon Nanotubes: Electron-Transfer Mechanism

Cited by 570 publications

References 62 publications

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

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

Confinement of CoP Nanoparticles in Nitrogen‐Doped Yolk‐Shell Porous Carbon Polyhedron for Ultrafast Catalytic Oxidation

A novel carbon nanotube–magnesium oxide composite with excellent recyclability to efficiently activate peroxymonosulfate for Rhodamine B degradation

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