Electrochemical removal of gaseous elemental mercury in liquid phase with a novel foam titanium-based DSA anode

Yang, Jie; Wang, Qing; Zhou, Jiacheng; Shen, Qicheng; Cao, Limei

doi:10.1016/j.seppur.2020.117162

Cited by 22 publications

(7 citation statements)

References 38 publications

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“…Relevant research , showed that electrochemical oxidation of pollutants could be achieved through two approaches: (1) direct oxidation on the surface of the anode; (2) indirect oxidation by the generated oxidants or free radicals at electrode surface. Electrochemical oxidation has received extensive attention in the field of pollutant remediation because of its simple device, controllable operation and green process. − In the field of gaseous pollutants treatment, Huang et al proposed a NO removal technology using electrochemical/PS AOT, and studied the technological parameters and mechanism of NO removal. They found that NO removal efficiency of above 80% was obtained in the developed electrochemical/PS activation system.…”

Section: Progress In So4•–-based Aots For Gaseous Pollutant Removalmentioning

confidence: 99%

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

Liu

Wang

2021

Environ. Sci. Technol.

105

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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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Section: Progress In So4•–-based Aots For Gaseous Pollutant Removalmentioning

confidence: 99%

“…(iv) green and clean process. 138,139,140,141,142,143 (i) simple device and easy to control; (i) low energy conversion efficiency; (iv) multiphase mass transfer limitation in reactor.…”

Section: Progress In Somentioning

confidence: 99%

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

Liu

Wang

2021

Environ. Sci. Technol.

105

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“…The Hg 0 removal efficiency exceeded 90% after 40 min electrolysis. Yang et al 156 prepared a dimensional stable Ti/ Sb-SnO 2 /PbO 2 electrode by an impregnation method to remove Hg 0 from flue gas in a gas diffusion electrochemical reactor with a stainless-steel mesh cathode and a Ti/Sb-SnO 2 / PbO 2 anode. The performance experiments indicated that the removal efficiency of Hg 0 could reach over 90%, which was about 1.7 times the removal of a single foam Ti under the same conditions.…”

Section: Electrochemical Removalmentioning

confidence: 99%

Review on Removal of SO₂, NO_x, Mercury, and Arsenic from Flue Gas Using Green Oxidation Absorption Technology

Wang

Liu

2021

Energy Fuels

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Emission of SO2, NO x , mercury (Hg), and arsenic (As) from flue gas has become a great public concern due to their hazards for human health and ecosystems. Simultaneous removal of multipollutants (two or more of SO2, NO x , Hg, and As) has good development prospects due to its simple system and low cost. Although many multipollutant simultaneous removal technologies have been developed, green oxidation absorption is one of the most promising technologies because it can not only make full use of the existing WFGD devices, but also its treatment process is clean. This review analyzes the latest research advances in the removal of SO2, NO x , Hg, and As from flue gas using green oxidation absorption technologies. The performance, mechanism, and kinetics of SO2, NO x , Hg, and As removal are reviewed. The merits and drawbacks of these green oxidation absorption technologies and the potential research directions are commented on. This review indicates that each technology has its own advantages and disadvantages in terms of removal efficiency, cost, reliability, and product post-treatment. Photochemical and electrochemical removal technologies have a high free radical yield and pollutant removal efficiency, but they have complex systems, high energy consumption, or unreliable systems. Metal oxide-activated peroxide oxidation technology has a good prospect due to its simple process, low device requirements, and recyclability of catalysts. However, it also has shortcomings such as a low free radical yield and easy deactivation of catalysts. Other technologies also have some disadvantages, such as high cost, low free radical yield, difficult separation of products, complex equipment, and/or low reliability. Synergic use of multitechnologies may be a promising strategy because it can make up for the shortcomings of each technology.

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“…Yang et al [32] studied the effect of different factors, such as a cell voltage, electrolyte and temperature, on the electrochemical removal of gaseous elemental mercury in the liquid phase using a Ti/Sn-SbO2/PbO2 electrode. More than 90% of mercury was removed under the conditions of 3 V, gas flow of 50 mL/min, electrolyte concentration of 0.5 M Na2SO4, pH 3, and temperature of 40 °C.…”

Section: Electrochemically-assisted Treatments Of Gaseous Effluentsmentioning

confidence: 99%

Relevance of gaseous flows in electrochemically assisted soil thermal remediation

Henrique

Cañizares

Sáez

et al. 2021

Current Opinion in Electrochemistry

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Electrochemical removal of gaseous elemental mercury in liquid phase with a novel foam titanium-based DSA anode

Cited by 22 publications

References 38 publications

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

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

Review on Removal of SO₂, NO_x, Mercury, and Arsenic from Flue Gas Using Green Oxidation Absorption Technology

Relevance of gaseous flows in electrochemically assisted soil thermal remediation

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Electrochemical removal of gaseous elemental mercury in liquid phase with a novel foam titanium-based DSA anode

Cited by 22 publications

References 38 publications

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

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

Review on Removal of SO2, NOx, Mercury, and Arsenic from Flue Gas Using Green Oxidation Absorption Technology

Relevance of gaseous flows in electrochemically assisted soil thermal remediation

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Product

Resources

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Review on Removal of SO₂, NO_x, Mercury, and Arsenic from Flue Gas Using Green Oxidation Absorption Technology