Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 280, Issue -, Pages 767-773Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2014.09.007
Keywords
Ionic liquid; Elemental mercury; Absorbent; Flue gas; Oxidation
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Funding
- China Postdoctoral Science Foundation [2013M542372]
- project from China Huaneng Group [HNKJ13-H01-04]
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1-Alkyl-3-methylimidazolium chloride ionic liquids ([C(n)mim] Cl, n=4, 6,8) were prepared. The ionic liquid was then mixed with hydrogen peroxide (H2O2) to form an absorbent. The Hg-0 removal performance of the absorbent was investigated in a gas/liquid scrubber using simulated flue gas. It was found that the ionic liquid/H2O2 mixture was an excellent absorbent and could be used to remove Hg-0 from flue gas. When the mass ratio of H2O2 to ionic liquid was 0.5, the absorbent showed high Hg-0 removal efficiency (up to 98%). The Hg-0 removal efficiency usually increased with the absorption temperature, while decreased with the increase of alkyl chain length in ionic liquid molecule. The Hg-0 removal mechanism involved with Hg-0 oxidation by H2O2 and Hg2+ transfer from aqueous phase to ionic liquid phase. (C) 2014 Elsevier B.V. All rights reserved.
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