Insight into elemental mercury (Hg0) removal from flue gas using UV/H2O2 advanced oxidation processes
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Elemental mercury (Hg0) emitted from coal-fired power plants and municipal solid waste (MSW) incinerators has caused great harm to the environment and human beings. The strong oxidized •OH radicals produced by UV/H2O2 advanced oxidation processes were studied to investigate the performance of Hg0 removal from simulated flue gases. The results showed that when H2O2 concentration was 1.0 mol/L and the solution pH value was 4.1, the UV/H2O2 system had the highest Hg0 removal efficiency. The optimal reaction temperature was approximately 50 °C and Hg0 removal was inhibited when the temperature was higher or lower. The yield of •OH radicals during UV/H2O2 reaction was studied by electron paramagnetic resonance (EPR) analysis. UV radiation was the determining factor to remove Hg0 in UV/H2O2 system due to •OH generation during H2O2 decomposition. SO2 had little influence on Hg0 removal whereas NO had an inhibitory effect on Hg0 removal. The detailed findings for Hg0 removal reactions over UV/H2O2 make it an attractive method for mercury control from flue gases.
KeywordsUV/H2O2 Hg0 Flue gas Removal •OH radical Mechanism
This work was supported by the National Natural Science Foundation of China (NSFC) (Nos. 51676101), China Postdoctoral Science Foundation (2017 M621779), the Natural Science Foundation of Jiangsu Province (No. BK20161558), and the College Natural Science Foundation of Jiangsu Province (No. 17KJB470009).
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