Nitrogen oxides are inevitable hazardous components in coal-fired flue gas. This study designed a series of experiments and combined theoretical calculations to systematically investigate the effect of NO on the removal of element mercury (Hg) by nano-amorphous selenium (nano-a-Se). It was found that the impact of NO on the removal of Hg by nano-a-Se primarily involves two mechanisms: competitive adsorption between NO and Hg, and the induced reduction effect of NO on chemisorbed mercury (HgSe). NO inhibits the removal of Hg by nano-a-Se, and competitive adsorption is identified as the main influencing factor. Whereas the inhibitory effect of NO on the adsorption of Hg by nano a-Se can be counteracted due to its oxidizing effect on Hg. Therefore, although NO presents stronger competitiveness than NO in the competitive adsorption with Hg, it still shows a promoting effect on Hg removal, with 50 ppm NO restoring 5.7 % of the Hg removal efficiency. Additionally, the mechanism of NO-induced reduction of HgSe was investigated in detail. NO is more capable of inducing the reduction of Hg(II) from HgSe to Hg. This study presents new insights into the underlying influence mechanism, which could provide valuable references for the application of other selenium-based adsorbents.
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| http://dx.doi.org/10.1016/j.scitotenv.2024.175698 | DOI Listing |
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