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Promotional effect of NH3 on mercury removal over biochar thorough chlorine functional group transformation by Huicong Zhang; Tao Wang; Yongsheng Zhang; Baomin Sun; Wei-Ping Pan is a Environmental Science article available to read on EtoBox.

What is Promotional effect of NH3 on mercury removal over biochar thorough chlorine functional group transformation about?

The mercury removal performance of chlorine plasma-modified biochar was tested under NH 3 and NH 3 combined with a NO/SO 2 atmosphere. The addition of NH 3 promotes the mercury removal process of modified biochar, and the mercury removal efficiency can be increased by up to 17.5%. NH 3 can induce the conversion of chloride to CeCl, making it easier to bind to Hg 0 . NO also exhibits a promoting effect on mercury removal. This is because Hg 0 can be converted to HgO by the oxidation of NO. When the flue gas contains both NH 3 and NO, the mercury removal efficiency is not as good as when the two gases are present alone. It is due to that NO will be consumed with NH 3 at high temperatures and NO 3 À will be generated on the surface of biochar and occupy the active site. SO 2 inhibits mercury removal by modified biochar through competitive adsorption. Sulphates and sulphites are more likely to form on the surface of biochar in the case of the coexistence of NH 3 and SO 2 . The deposition of the chemical salt on the surface of the biochar causes the pores to be blocked and the active sites to be occupied, thereby deteriorating the efficiency of mercury removal.

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Author

Huicong Zhang; Tao Wang; Yongsheng Zhang; Baomin Sun; Wei-Ping Pan

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0959-6526)

Published

2020

Language

EN

Field

Environmental Science (Physical Sciences)