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NOx attenuation in flue gas by OH/SO4•--based advanced oxidation processes

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Abstract

The combustion of fossil fuels has resulted in rapidly increasing emissions of nitrogen oxide (NOx), which has caused serious human health and environmental problems. NO capture has become a research focus in gas purification because NO accounts for more than 90% of NOx and is difficult to remove. Advanced oxidation processes (AOPs), features the little secondary pollution and the broad-spectrum strong oxidation of hydroxyl radicals (OH), are effective and promising strategies for NO removal from coal-fired flue gas. This review provides the state of the art of NO removal by AOPs, highlighting several methods for producing OH and SO4•−. According to the main radicals responsible for NO removal, these processes are classified into two categories: hydroxyl radical-based AOPs (HR-AOPs) and sulfate radical-based AOPs (SR-AOPs). This paper also reviews the mechanisms of NO capture by reactive oxygen species (ROS) and SO4•− in various AOPs. A HiGee (high-gravity) enhanced AOP process for improving NO removal, characterized by intensified gas-liquid mass transfer and efficient micro-mixing, is then proposed and discussed in brief. We believe that this review will be useful for workers in this field.

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Abbreviations

AOPs:

advanced oxidation processes

HR-AOPs:

hydroxy radical-based advanced oxidation processes

SR-AOPs:

persulfate radical-based advanced oxidation processes

RPB:

rotating packed bed

Fe2+ :

ferrous ion

H2O2 :

hydrogen peroxide

NO:

nitric oxide

NO2 :

nitrogen dioxide

\( {\mathrm{NO}}_3^{-} \) :

nitrate ion

\( {\mathrm{NO}}_2^{-} \) :

nitrite ion

HO2 :

hydroperoxyl radical

SO2 :

sulfur dioxide

\( {\mathrm{S}}_2{\mathrm{O}}_8^{2\hbox{-} } \) :

peroxydisulfate

\( {\mathrm{HSO}}_5^{\hbox{-} } \) :

PMS, peroxymonosulfate

SO4•− :

sulfate radical

rpm:

revolutions per minute

k1-k9 :

rate constant

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Acknowledgments

The authors acknowledge the funding received from the University of Chinese Academy of Science for financial assistance via Grant Y8540XX222. The institution and program is gratefully acknowledged.

Funding sources

This study was supported by the University of Chinese Academy of Science (No. Y8540XX222).

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The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript.

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Correspondence to Zhi Qian.

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The authors declare that they have no competing interests.

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Responsible Editor: Vítor Pais Vilar

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Chen, H., Wang, C., Zhang, J. et al. NOx attenuation in flue gas by OH/SO4•--based advanced oxidation processes. Environ Sci Pollut Res 27, 37468–37487 (2020). https://doi.org/10.1007/s11356-020-09782-1

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  • DOI: https://doi.org/10.1007/s11356-020-09782-1

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