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Purification of Hg0 from flue gas by wet oxidation method and its mechanism: a review

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Abstract

The vast majority of Hg2+ can be removed while elemental mercury (Hg0) can hardly be removed due to its characteristic of high volatility and insolubility in water. Till now, how to oxidize Hg0 to Hg2+ is the key for the purification of Hg0, especially when there are others pollutants, such as HCl, SO2, and NOx. In this review, the method and mechanism of Hg0 purification from flue gas by H2O2, KMnO4, NaClO2, and O3 are reviewed comprehensively. It is concluded that the oxidation of Hg0 mainly depends on the electronic supply efficiency from the solution. The Fenton reagent, composed of H2O2 and metal cations, is superior to O3 and the solution of KMnO4 and NaClO2. Moreover, HCl, SO2, and NOx in the flue gas can influence the oxidation and purification mechanism of Hg0. It is found that HCl in flue gas had obvious auxo-action on the oxidation of mercury, and SO2 and NOx have different effects on the oxidation of Hg0 with the change of compositions and concentration of pollutants in the flue gas. In general, SO2 and NOx can slightly promote the oxidation of Hg0 due to the synergistic effect.

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  1. Bojun Yan contributed equally to this work.

Authors and Affiliations

  1. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Yi Xing, Bojun Yan, Pei Lu, Xiaoxu Cui & Mengsi Wang

  2. Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, China

    Yi Xing, Bojun Yan & Pei Lu

  3. School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, China

    Liuliu Li

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Xing, Y., Yan, B., Lu, P. et al. Purification of Hg0 from flue gas by wet oxidation method and its mechanism: a review. Environ Sci Pollut Res 24, 26310–26323 (2017). https://doi.org/10.1007/s11356-017-0480-6

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