School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, China.
Environ Sci Pollut Res Int. 2017 Dec;24(34):26310-26323. doi: 10.1007/s11356-017-0480-6. Epub 2017 Oct 23.
The vast majority of Hg can be removed while elemental mercury (Hg) can hardly be removed due to its characteristic of high volatility and insolubility in water. Till now, how to oxidize Hg to Hg is the key for the purification of Hg, especially when there are others pollutants, such as HCl, SO, and NOx. In this review, the method and mechanism of Hg purification from flue gas by HO, KMnO, NaClO, and O are reviewed comprehensively. It is concluded that the oxidation of Hg mainly depends on the electronic supply efficiency from the solution. The Fenton reagent, composed of HO and metal cations, is superior to O and the solution of KMnO and NaClO. Moreover, HCl, SO, and NOx in the flue gas can influence the oxidation and purification mechanism of Hg. It is found that HCl in flue gas had obvious auxo-action on the oxidation of mercury, and SO and NOx have different effects on the oxidation of Hg with the change of compositions and concentration of pollutants in the flue gas. In general, SO and NOx can slightly promote the oxidation of Hg due to the synergistic effect.
绝大多数汞可以被去除，而元素汞（Hg）由于其高挥发性和不溶于水的特性，几乎难以去除。到目前为止，如何将汞氧化为 Hg 是净化汞的关键，特别是当存在其他污染物如 HCl、SO 和 NOx 时。在本综述中，全面回顾了通过 HO、KMnO、NaClO 和 O 从烟气中净化 Hg 的方法和机理。结论表明，Hg 的氧化主要取决于溶液中电子供应效率。由 HO 和金属阳离子组成的 Fenton 试剂优于 O 和 KMnO 和 NaClO 的溶液。此外，烟气中的 HCl、SO 和 NOx 会影响 Hg 的氧化和净化机制。研究发现，烟气中的 HCl 对汞的氧化具有明显的辅助作用，而 SO 和 NOx 对 Hg 的氧化有不同的影响，这取决于烟气中污染物的组成和浓度的变化。一般来说，由于协同作用，SO 和 NOx 可以略微促进 Hg 的氧化。
