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Currently, most advanced oxidation denitrification technologies require long flue gas residence time to obtain ideal NO removal efficiency. The NaOH-catalyzed HO system proposed in this paper can obtain 98% NO removal efficiency under the condition of flue gas residence time of 3 s. The mechanism of NO removal and HO decomposition to O were proposed. It was confirmed with ESR (Electron-spin-resonance), inhibitor experiments and UV-Vis spectrophotometer that the main group in the reaction process was·O radicals, which reacted with NO to form ONOO, and ONOO would be gradually transformed into NO and NO in the air. The effect of some primary factors on the NO removal efficiency and the percentage of HO decomposition to O were also investigated. The increase of initial pH has a positive effect on NO removal, while the promotion of NO removal by increasing HO concentration and reaction temperature is limited and the increase of NO has a negative effect on NO removal. Initial pH has a dual impact on the percentage of HO decomposition to O, HO concentration and reaction temperature promote the decomposition of HO to O, while NO concentration has an inhibiting effect on it.
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| http://dx.doi.org/10.1016/j.jhazmat.2022.129788 | DOI Listing |
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