A Novel Method on Simultaneous Removal of SO₂, NO and Hg⁰ from Simulated Flue Gas

Abstract:

A novel wet process has been developed to simultaneously remove NO, SO₂ and Hg⁰ from flue gas. According to the conditions of the bubbling reactor, diperiodatocuprate (Ⅲ) coordination ion solution was prepared with CuSO₄•5H₂O, KIO₄, K₂S₂O₈, and KOH, and the effects of the various influencing factors, such as diperiodatocuprate (Ⅲ) coordination ion solution concentration, reaction temperature, solution pH on removal efficiencies were investigated. The removal efficiencies of 98% for SO₂, 90% for Hg⁰ and 56.8% for NO were obtained, respectively, under the optimal experimental conditions, in which diperiodatocuprate (Ⅲ) coordination ion solution concentration was 6 mmol /L, the reaction temperature was 323 K, and the solution pH was 9.0. That [Cu(OH)₂(H₃IO₆)]^- was the main existing form of the absorbent at the optimal experimental conditions was confirmed by calculating the concentration ratios of IO₄^- and its dissociation products / [IO₄^-]_ex under different pH, and thereby simultaneous removal mechanism for SO₂, NO and Hg⁰ was proposed.

• Periodical: Applied Mechanics and Materials (Volumes 316-317)
• Pages: 214-218
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.316-317.214
• Online since: April 2013
• Authors: Yi Zhao, Fang Ming Xue, Yuan Shao
• Keywords: Denitrification, Desulfurization, Diperiodatocuprate (III), Hg⁰ Removal, Oxidation Reaction

References

[1] S.V. Krishnan, B.K. Gullett, W. Jozewicz, Sorption of elemental mercury by activated carbons, Environ. Sci. Technol. 28 (1994) 1506-1512.

DOI: 10.1021/es00057a020

[2] H.W. Jie, Y. Zhang, L. Q. Yin, Present situation of research of acid rain, Environ. Sci. Technol. 27 (2004) 179-181.

[3] X.C. Xiao, X.N. Wang, Study on pollution and control of NOx in air environment, Coal Technol. 24 (2005) 1-2.

[4] J.H. Shan, H.Y. Wei, L. Wang, Kinetics and mechanism of oxidation of some amino acids by diperiodatonickelate (Ⅳ) complex in alkaline medium, Indian J Chem. 40(A) (2001) 865-869.

[5] Y.J. Wang, N.F. Duan, L.G. Yang, S.L. Meng, Z.J. Huang, Experimental study on mercury removal by combined wet flue gas desulphurization with electrostatic precipitator, Proc. Chin. Soc..Electr. Eng. 28 (2008) 64-69 (in Chinese) .

[6] S.J. Chung, K.C. Pillai, I.S. Moon, A sustainable environmentally friendly NOx removal process using Ag(II)/Ag(I)-mediated electrochemical oxidation, Sep. Purif. Technol. 65 (2009) 156-163.

DOI: 10.1016/j.seppur.2008.10.030

[7] Y. Zhao, Y.H. Han, T.Z. Ma, T.X. Guo, Simultaneous desulfurization and denitrification from flue gas by Ferrate(VI), Environ. Sci. Technol. 45 (2011) 4060-4065.

DOI: 10.1021/es103857g

[8] Y. Zhao, J. Han, Y. Shao, Y.N. Feng, Simultaneous SO2 and NO removal from flue gas based on TiO2 photocatalytic oxidation, Environ. Technol. 30 (2009) 555-1563.

[9] T.W. Chien, H. Chu, H.T. Hsueh, Kinetic study on absorption of SO2 and NOx with acidic NaClO2 solutions using the spraying column, J. Environ. Eng. 129 (2003) 967-974.

DOI: 10.1061/(asce)0733-9372(2003)129:11(967)

[10] Y. Zhao, T.X. Guo, Z.Y. Chen, Y.R. Du, Simultaneous removal of SO2 and NO using M/NaClO2 complex absorbent, Chem. Eng. J. 160 (2010) 42-47.

DOI: 10.1016/j.cej.2010.02.060

[11] P.K. Jaiswal, K.L. Yadava, Determination of sugars and organic acids with periodate complex of Cu(Ⅲ), Indian J. Chem. 11 (1973) 837-838.

[12] G. Sun, X.Q. Yang, H.X. Shi, D.C. Wang, Removal of gaseous elemental mercury in potassium persulfate solution, Environ. Pollut. Control. 29 (2007) 168-170 (in Chinese).

[13] Q.F. Ye, C.Y. Wang, X.H. Xu, D.C. Wang, Mass transfer-reaction of Hg0 absorption in potassium permanganate, J. Zhejiang Univ. Eng. Sci. 41 (2007) 831-835 (in Chinese).

[14] D. Shekappa, N.P. Naik, S.T. Nandibewoor, Spectral and mechanistic investigation of the osmium(VIII) catalyzed oxidation of diclofenac sodium by the Copper(III) periodate complex in aqueous alkaline medium, J Solution Chem. 39 (2010) 1291-1310.

DOI: 10.1007/s10953-010-9587-9

[15] S.J. Malode, N.P. Shetti, S.T. Nandibewoor, Thermodynamic quantities for the different steps involved in the oxidation of the drug ketorolac by Copper(III) periodate complex in aqueous alkaline medium: a mechanistic approach, J Solution Chem. 39 (2010) 417-430.

DOI: 10.1007/s10953-010-9501-5

[16] A.A. Mahantesh, M.T. Suresh, Oxidation of fursemide by diperiodatocuprate(III) in aqueous alkaline medium-a kinetic study, J. Solution Chem. 39 (2010) 165-177.

DOI: 10.1007/s10953-009-9492-2

[17] M.B. Bellakki, R.T. Mahesh, S.T. Nandibewoor, Mechanistic and spectral investigation of oxidation of 4-hydroxy coumarin by diperiodatocuprate (Ⅲ) in aqueous alkaline medium. Proceedings of the national academy of sciences India, 75(A) (2005) 177-182.