The application of microwaves in sulfate radical-based advanced oxidation processes for environmental remediation: A review

Hu, Lianzhe; Wang, Peng; Shen, Tianyao; Wang, Qiao; Wang, Xiaojing; Xu, Peng; Zheng, Qingzhu; Zhang, Guangshan

doi:10.1016/j.scitotenv.2020.137831

Cited by 91 publications

(30 citation statements)

References 69 publications

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“…However, when the heterogeneous SR-Fenton like system was irradiated by visible LED light, strong signals of DMPO-OH peaks were observed. The EPR signals of DMPO-SO 4 were found with weak intensity owing to the quick reaction with H 2 O, leading to the generation of hydroxyl radicals, which made it difficult to capture the signal in the solution [51]. The signal remained sharp after 5 min reaction, evidencing the persistent production of these free radicals.…”

Section: Proposed Reaction Mechanismmentioning

confidence: 99%

Visible Light Driven Spherical CuBi2O4 with Surface Oxygen Vacancy Enhanced Photocatalytic Activity: Catalyst Fabrication, Performance, and Reaction Mechanism

et al. 2020

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Here, a spherical CuBi2O4 catalyst with surface oxygen vacancy was fabricated through a facile hydrothermal method, which exhibited remarkable enhanced photocatalytic activity of refractory chemicals in the heterogeneous sulfate radical-based Fenton-like reaction under visible light emitting diode (LED) light irradiation. The property of the catalysts was systematically characterized by scanning electron microscopy (SEM)/high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV/vis methods. The effects of parameters of solution pH, potassium peroxymonosulfate (PMS) concentration, catalyst dosage, and catalyst reusability on Rhodamine B (RhB) degradation were investigated. In the interface reaction, the improved photodegradation efficiency could be attributed to the decomposition of PMS, which produced sulfate radicals and hydroxyl radicals owing to the transmission of photo-generated electron/hole pairs. Herein, the introduction of surface oxygen vacancy as well as the cycling of copper valence states (Cu(II)/Cu(I) pairs) can facilitate the production of free reactive radicals, leading to the high degradation efficiency. The catalyst showed high removal efficiency and presented good cycle stability in the reaction. Additionally, the free radical quencher experiment and electron spin resonance (EPR) experiments were conducted, and a proposed photocatalytic mechanism was also illustrated.

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Section: Proposed Reaction Mechanismmentioning

confidence: 99%

Visible Light Driven Spherical CuBi2O4 with Surface Oxygen Vacancy Enhanced Photocatalytic Activity: Catalyst Fabrication, Performance, and Reaction Mechanism

et al. 2020

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“…•− ) based advanced oxidation processes have successfully replaced OH • based advanced oxidation processes to a certain extent (Hu et al, 2020;Xiao et al, 2019;Oh et al, 2016 (Matzek and Carter, 2016). • The low cost of PDS i.e.…”

Section: Introductionmentioning

confidence: 99%

Advanced activation of persulfate by polymeric g-C3N4 based photocatalysts for environmental remediation: A review

Hasija

Nguyen

Kumar

et al. 2021

Journal of Hazardous Materials

329

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Photocatalytic materials for photocatalysis is recently proposed as a promising strategy to address environmental remediation. Metal-free graphitic carbon nitride (g-C 3 N 4 ), is an emerging photocatalyst in sulfate radical based advanced oxidation processes. The solar-driven electronic excitations in g-C 3 N 4 are capable of peroxo (O-O) bond dissociation in peroxymonosulfate/peroxydisulfate (PMS/PDS) and oxidants to generate reactive free radicals, namely SO 4•− and OH • in addition to O 2 •− radical. The synergistic mechanism of g-C 3 N 4 mediated PMS/ PDS photocatalytic activation, could ensure the generation of OH • radicals to overcome the low reductive potential of g-C 3 N 4 and fastens the degradation reaction rate. This article reviews recent work on heterojunction formation (type-II heterojunction and direct Z-scheme) to achieve the bandgap for extended visible light absorption and improved charge carrier separation for efficient photocatalytic efficiency. Focus is placed on the fundamental mechanistic routes followed for PMS/PDS photocatalytic activation over g-C 3 N 4 -based photocatalysts. A particular emphasis is given to the factors influencing the PMS/PDS photocatalytic activation mechanism and the contribution of SO 4 •− and OH • radicals that are not thoroughly investigated and require further studies. Concluding perspectives on the challenges and opportunities to design highly efficient persulfateactivated g-C 3 N 4 based photocatalysts toward environmental remediation are also intensively highlighted.

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“…Based on the existing main reviews in this area, it can be seen that most of existing reviews mainly focus on the research and application of non SO 4 • – -based AOTs (i.e., •OH, •O, HO 2 •, •O 2 – ) in gaseous pollutant control field. Compared with non SO 4 • – -based AOTs, SO 4 • – -based AOTs are receiving more and more attention in the field of environmental protection in recent years because of the following advantages: (i) related research − has shown that SO 4 • – has stronger oxidation ability for some refractory pollutants due to their high reaction rate (10 6 –10 9 M –1 s –1 ) and longer life span ( t 1/2 = 30–40 μs) than other free radicals such as •OH, which thus can achieve more complete degradation (the oxidation potential of SO 4 • – is up to 2.5–3.1 V, which exceeds 2.8 V of •OH under the best conditions); (ii) the precursor of •OH is mainly H 2 O 2 . The moisture content of industrial grade H 2 O 2 is as high as 72.5%, which leads to the difficulty in large-scale transportation and storage.…”

Section: Introductionmentioning

confidence: 99%

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

Liu

Wang

2021

Environ. Sci. Technol.

103

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Excessive emissions of gaseous pollutants such as SO2, NO x , heavy metals (Hg, As, etc.), H2S, VOCs, etc. have triggered a series of environmental pollution incidents. Sulfate radical (SO4•–)-based advanced oxidation technologies (AOTs) are one of the most promising gaseous pollutants removal technologies because they can not only produce active free radicals with strong oxidation ability to simultaneously degrade most of gaseous pollutants, but also their reaction processes are environmentally friendly. However, so far, the special review focusing on gaseous pollutants removal using SO4•–-based AOTs is not reported. This review reports the latest advances in removal of gaseous pollutants (e.g., SO2, NO x , Hg, As, H2S, and VOCs) using SO4•–-based AOTs. The performance, mechanism, active species identification and advantages/disadvantages of these removal technologies using SO4•–-based AOTs are reviewed. The existing challenges and further research suggestions are also commented. Results show that SO4•–-based AOTs possess good development potential in gaseous pollutant control field due to simple reagent transportation and storage, low product post-treatment requirements and strong degradation ability of refractory pollutants. Each SO4•–-based AOT possesses its own advantages and disadvantages in terms of removal performance, cost, reliability, and product post-treatment. Low free radical yield, poor removal capacity, unclear removal mechanism/contribution of active species, unreliable technology and high cost are still the main problems in this field. The combined use of multiactivation technologies is one of the promising strategies to overcome these defects since it may make up for the shortcomings of independent technology. In order to improve free radical yield and pollutant removal capacity, enhancement of mass transfer and optimization design of reactor are critical issues. Comprehensive consideration of catalytic materials, removal chemistry, mass transfer and reactor is the promising route to solve these problems. In order to clarify removal mechanism, it is essential to select suitable free radical sacrificial agents, probes and spin trapping agents, which possess high selectivity for target specie, high solubility in water, and little effect on activity of catalyst itself and mass transfer/diffusion parameters. In order to further reduce investment and operating costs, it is necessary to carry out the related studies on simultaneous removal of more gaseous pollutants.

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The application of microwaves in sulfate radical-based advanced oxidation processes for environmental remediation: A review

Cited by 91 publications

References 69 publications

Visible Light Driven Spherical CuBi2O4 with Surface Oxygen Vacancy Enhanced Photocatalytic Activity: Catalyst Fabrication, Performance, and Reaction Mechanism

Visible Light Driven Spherical CuBi2O4 with Surface Oxygen Vacancy Enhanced Photocatalytic Activity: Catalyst Fabrication, Performance, and Reaction Mechanism

Advanced activation of persulfate by polymeric g-C3N4 based photocatalysts for environmental remediation: A review

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

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