Removal of pollutants from gas streams using Fenton (-like)-based oxidation systems: A review

Liu, Yangxian; Shi, Shuo; Wang, Yan

doi:10.1016/j.jhazmat.2021.125927

Cited by 52 publications

(27 citation statements)

References 108 publications

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“…•O 2 – shows insensitivity to common free radical sacrificial agents (e.g., methanol, ethanol, TBA, etc. ). , Several reagents such as sodium carbonate (NaCO 3 , k NaCO 3 ‑O 2 – = 1.5 × 10 9 M –1 S –1 ), p-BQ ( k P‑BQ‑O 2 – = 9.0 × 10 8 M –1 S –1 ), nitro blue tetrazolium (NBT, k NBT –O 2 – = 1.5–2.3 × 10 9 M –1 S –1 ), chloroform (CF, k CF –O 2 – = 3.0 × 10 10 M –1 S –1 ), etc., which possess high reaction rates with •O 2 – , are reported to used as the sacrificial agents of •O 2 – (their reaction rate constants are close to 10 – M –1 S –1 ). The common sacrificial agentsof 1 O 2 mainly include sodium azide (NaN 3 , k NaN 3 ‑ 1 O 2 = 1.0–2.0 × 10 9 M –1 S –1 ), furfuryl alcohol (FFA, k FEA‑ 1 O 2 = 1.2 × 10 8 M –1 S –1 ), 2,5-dimethyl-furan ( k 2,5‑dim‑ 1 O 2 = 4.0 × 10 8 M –1 S –1 ), 9,10-anthracene dipropiomic ( k 9,10‑anth‑ 1 O 2 = 8.2 × 10 7 M –1 S –1 ), diphenylanthracene (DPA, k DPA‑ 1 O 2 = 8.2 × 10 7 M –1 S –1 ), l -Histidine ( k L‑his‑ 1 O 2 = 3.0 × 10 7 M –1 S –1 ) and so on.…”

Section: Detection and Identification Of Active Speciesmentioning

confidence: 99%

“…Since the 1930s, a number of major air pollution events have occurred around the world, such as photochemical smog in MAS Valley in Belgium, Los Angeles in the United States, London smog in Britain, Yokkaichi Asthma Episode and Minamata disease in Japan, Haze events in China, etc. − These environmental pollution accidents not only cause huge economic and property losses to human society, but also pose a great threat to human health and the environment. In common gaseous pollutants, SO 2 and NO x are the main precursors of acid rain, haze and/or photochemical smog. − Trace heavy metals such as mercury (Hg), arsenic (As), etc. have persistence, bioaccumulation, neurological toxicity, and potential carcinogenic properties. − VOCs can irritate the eyes and respiratory tract, cause cancer, and recently are also considered to be the important precursors for the formation of fine particles (PM 2.5 ) and ozone. − H 2 S is not only a precursor of acid rain, but also can corrode equipment and deactivate catalysts/electrodes. − Air pollution has become one of the serious obstacles to the further development of global economy and processive promotion of human living standard.…”

Section: Introductionmentioning

confidence: 99%

“…There are some disadvantages in this kind of independent processing strategy for every gaseous pollutant, such as complex systems, high investment, and operation costs. Simultaneous removal technologies of multigaseous pollutants (two or more gaseous pollutants) possess good prospect of industrial application because of its simpler system, and lower investment and operation costs. − So far, many simultaneous removal technologies of multigaseous pollutants have been developed, which mainly include catalytic oxidation, plasma removal, adsorption, photocatalytic, photochemical removal, microwave removal, chemical oxidation, and so on. ,,,− In these technologies, free radical induced-AOTs are considered to be one of the most promising technologies because they can not only produce highly active free radicals with strong oxidation ability to simultaneously degrade most of gaseous pollutants (they are especially suitable for simultaneous removal of multigaseous pollutants), but also their reaction processes are environmentally friendly. − …”

Section: Introductionmentioning

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.

Self Cite

114

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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: Detection and Identification Of Active Speciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Liu

Wang

2021

Environ. Sci. Technol.

Self Cite

114

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“… 24 , 25 Scholars have carried out a lot of experiments and theoretical studies on mercury removal by activated carbon from coal-fired flue gas. 26 − 28 However, activated carbon is expensive and not suitable for large-scale commercial use. Nowadays, researchers have turned their attention to biomass.…”

Section: Introductionmentioning

confidence: 99%

Interference Effect of Experimental Parameters on the Mercury Removal Mechanism of Biomass Char under an Oxy-Fuel Atmosphere

Zhu

Wang

et al. 2021

ACS Omega

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In this paper, the effect of temperature, adsorption bed height, and initial mercury concentration under oxy-fuel combustion on mercury adsorption by 1% NH 4 Cl-modified biomass char was studied. Modification enriched the pore structure of biomass char and increased the number of surface functional groups. Higher temperature would lead to the destruction of van der Waals and reduce the adsorption efficiency, while the change of adsorption bed height had no obvious effect. Adsorption thermodynamics shows that the mercury removal process is a spontaneous exothermic process. The increase of initial mercury concentration would increase the driving force of mercury diffusion to the surface and improve the adsorption capacity. Meanwhile, three kinetic models including the intraparticle diffusion model, pseudo-first-order model, and pseudo-second-order model were applied to explore the internal mechanism of mercury adsorption by biomass char. The results showed that the pseudo-first-order model and pseudo-second-order model could accurately describe the adsorption process, which meant that the progress of external mass transfer played an important role in the adsorption of mercury while chemical adsorption should not be ignored. The intraparticle diffusion model indicated that internal diffusion was not the only step to control the entire adsorption process and did not have an inhibition on mercury removal. Higher initial mercury concentration would promote the external mass transfer progress and chemical adsorption progress. In addition, higher temperature inhibited the external mass transfer, which was not conducive to the adsorption of mercury.

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“…By advanced oxidation processes (AOPs) with a liquid absorbent such as hydrogen peroxide (H 2 O 2 ), NO can be oxidized to NO 2 which can be captured in solution [4]. Ding et al [5] proposed an oxidation-removal process capable of removing NOx and SO 2 simultaneously, and they discovered that the NOx removal efficiency reached 80%, and was primarily dependent on the flow rate of H 2 O 2 solution as well as the gas volume concentration.…”

Section: Introductionmentioning

confidence: 99%

Effects of Operating and Structural Parameters on Removal of Nitric Oxide by Oxidation in a Ceramic Hollow Fiber Membrane Contactor

Yuan

2021

Membranes

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A numerical study on the oxidation removal of nitric oxide in a ceramic hollow fiber membrane contactor was performed. To represent the transport and absorption process, the model was created by combining multiphase, species, reaction, and porous models. The numerical results were verified by comparing them with experimental data. The tube and lumen sides both have laminar parabolic velocity distributions. The nitric oxide concentration decreases gradually from the membrane wall to axis at the cross-section except on the inner and outer sides of the membrane tube. The equivalent diffusion length was proved useful for evaluating the entrance effect. At low concentrations, the reduction efficiency was proportional to the absorbent concentration, and at large concentrations, it neared a maximum value. The reduction efficiency was positively affected by elevated operating temperature and pressure. With a gas channel width of 13 mm, the reduction flow rate achieves its maximum. The efficiency of NO reduction per area decreases as the effective membrane length increases. Increasing the operating temperature and membrane length are recommended as design priorities due to high relative enhancements. It is not recommended to improve reduction efficiency by increasing membrane tube diameter and operating pressure in design. Changing the gas flow rate, absorbent concentration and gas channel width are moderate recommended as well.

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Removal of pollutants from gas streams using Fenton (-like)-based oxidation systems: A review

Cited by 52 publications

References 108 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

Interference Effect of Experimental Parameters on the Mercury Removal Mechanism of Biomass Char under an Oxy-Fuel Atmosphere

Effects of Operating and Structural Parameters on Removal of Nitric Oxide by Oxidation in a Ceramic Hollow Fiber Membrane Contactor

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