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).
- Alharbi SK, Kang J, Nghiem LD, van de Merwe JP, Leusch FDL, Price WE (2017) Photolysis and UV/H2O2 of diclofenac, sulfamethoxazole, carbamazepine, and trimethoprim: identification of their major degradation products by ESI-LC-MS and assessment of the toxicity of reaction mixtures. Process Saf Environ Prot 112:222–234CrossRefGoogle Scholar
- Oliveira AG, Ribeiro JP, Oliveira JT, Keukeleire DD, Duarte MS, Nascimento RF (2014) Degradation of the pesticide chlorpyrifos in aqueous solutions with UV/H2O2: optimization and effect of interfering anions. J Adv Oxid Technol 17(1):133–138Google Scholar
- Uffalussy KJ, Granite EJ (2015) Novel capture technologies: non-carbon sorbents and photochemical oxidations. In Granite EJ, Henry WP, Connie S (ed) Mercury control for coal-derived gas streams. Wiley-VCH, pp 339–356Google Scholar
- Wang L, Ji Y, Lu J, Kong D, Yin X, Zhou Q (2017) Comparative study of the formation of brominated disinfection byproducts in UV/persulfate and UV/H2O2 oxidation processes in the presence of bromide. Environ Sci Pollut R 24(29):23219–23225Google Scholar