Abstract
Oxidation–reduction-absorption based on sulfite is a promising process for simultaneous removal of NOx and SO2. However, excessive oxidation of sulfite and competitive absorption between NOx and SO2 limit its application. A matching strategy between antioxidants and alkaline agents has been proposed to solve these problems and enhance the absorption process. The comparison results of inhibitors showed that hydroquinone exhibited long-term high-efficiency inhibition of S(IV) (SO32-/HSO3-) oxidation. The comparison of alkaline agents showed that the Na2SO3 solution with heterogeneous mixture of MgO and hydroquinone exhibited better absorption performance than that with other combinations. The absorption amounts of NOx in 0.15 mol/L Na2SO3 50 mL solution added 0.1% hydroquinone (HQ) with 0.09 mol/L MgO were 2.24 mmol, which improved 5 times than that without additives. In addition, studies on the influence of pH showed that the pH of MgO mixture could be stabilized at 9–10 for a long time, while the pH of Na2CO3 mixture decreased faster. Further studies suggested that the hydration of MgO resulted in the solution with MgO keeping high pH. This is also the main reason why the combination of MgO and hydroquinone is superior to the combination of Na2CO3 and hydroquinone in desulfurization and denitration performance.
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This work was financially supported by the National Natural Science Foundation of China (No.21976118) and the Startup Fund for Youngman Research at SJTU (No. 19X100040083).
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Wenjun Huang and Sichao Li: conceptualization, methodology, data curation, writing-original draft. Haomiao Xu, Hongbin Wang, and Peng Cui: writing-review and editing, supervision. Can Cheng, Zan Qu, and Naiqiang Yan: supervision. All authors have read and agreed to the published version of the manuscript.
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11356_2022_20748_MOESM1_ESM.docx
Supplementary file1 (DOCX 197 kb) The Schematic diagram of absorption experimental setup was shown in Fig. S1. The oxidation-reduction-absorption (O-r-A) process was shown in Fig. S2. The effect of additive amount on the increase of NOx absorption amount by unit additives amount in Fig. S3. The dependence of Mg2+ concentration and pH value with reaction time was shown in Figure S4. The reaction agents costs of the removal SO2 and NOx were listed in Table S1.
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Huang, W., Li, S., Wang, H. et al. Buffer effect of MgO on Na2SO3 to stabilize S(IV) for the enhancement in simultaneous absorption of NOx and SO2 from non-ferrous smelting gas. Environ Sci Pollut Res 29, 71721–71730 (2022). https://doi.org/10.1007/s11356-022-20748-3
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DOI: https://doi.org/10.1007/s11356-022-20748-3