HONEYCOMB-LIKE MESOPOROUS g-C3N4 FOR ELEMENTAL MERCURY REMOVAL FROM SIMULATED FLUE GAS

Dongjing Liu, Zhen Zhang, Liang Liu and Jiang Wu
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Dongjing Liu: School of Energy and Power Engineering, Jiangsu University, 212013 Zhenjiang, P. R. China
Zhen Zhang: #x2020;College of Energy and Mechanical Engineering, Shanghai University of Electric Power, 200090 Shanghai, P. R. China
Liang Liu: School of Energy and Power Engineering, Jiangsu University, 212013 Zhenjiang, P. R. China
Jiang Wu: #x2020;College of Energy and Mechanical Engineering, Shanghai University of Electric Power, 200090 Shanghai, P. R. China

Surface Review and Letters (SRL), 2020, vol. 27, issue 12, 1-9

Abstract: The π-conjugated graphitic carbon nitride (g-C3N4) has gained increasing attention due to its unique electronic property, accessible nanoporous framework, chemical and thermal stability. The nanopore structure of g-C3N4 is believed to be favorable for adsorption process owing to the improved mass transfer process. Here, a honeycomb-like mesoporous g-C3N4 is synthesized by direct thermal polymerization of the mixture of urea and ammonium carbonate. It displays an excellent affinity with elemental mercury at reaction temperatures of 50–200∘C. The optimal mass ratio of ammonium carbonate/urea is 2 with the highest Hg0 removal efficiency of 87.5% at 120∘C. NO has a negative effect on Hg0 removal, whereas SO2 slightly reinforces Hg0 adsorption in the presence of oxygen. The Hg0 is probably captured on the carbon atoms of g-C3N4 by producing a covalent carbon-mercury (C–Hg) bond via Lewis acid-base interactions.

Keywords: Elemental mercury; graphitic carbon nitride; Lewis acid-base interaction; carbon–mercury bond (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X20500171

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