Removal of aqueous Fe2+ using MnO2-clinoptilolite in a batch slurry reactor: Catalyst synthesis, characterization and modeling of catalytic behavior

Reihaneh Pashmineh Azar; Cavus Falamaki

Journal of Industrial and Engineering Chemistry, Vol.18, No.2, 737-743, March, 2012

DOI10.1016/j.jiec.2011.11.112 Export Citation

Removal of aqueous Fe2+ using MnO2-clinoptilolite in a batch slurry reactor: Catalyst synthesis, characterization and modeling of catalytic behavior

Reihaneh Pashmineh Azar¹, and Cavus Falamaki^{1, 2, †}

¹Chemical Engineering Department, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
²Petrochemical Center of Excellence, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran

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An Iranian clinoptilolite has been modified with MnO2 for the catalytic removal of Fe2+ cations from water in a batch slurry reactor. The modified zeolite was subjected to FESEM, XRD, WDX, XRF and specific surface area analysis. A correlation for the intrinsic catalytic reaction rate incorporating both Fe2+ and dissolved oxygen concentration as a function of reaction temperature has been presented. The effect of the modified zeolite aggregate particle size on the iron removal kinetics has been investigated. It was shown that for particles larger than 150 mm, diffusion through the mesopores of the zeolite aggregate is rate controlling. The effective diffusion coefficient through the particles at RT has been calculated as 2.3 × 10^(-6) cm2 s^(-1). It is shown that liquid phase molecular diffusion within the mesopores is the dominating mass transfer mechanism.

Keywords:Clinoptilolite;Catalysis;Diffusion;Manganese oxide;Iron removal

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[1] Engin B, Guru M, Alicilar A, Asian J. Chem., 21, 2067 (2009)

[2] Guha H, Saiers JE, Brooks S, Jardine P, Jayachandran K, J. Cont. Hydr., 49, 311 (2001)

[3] Tarasevich YI, Polyakov VE, Ivanova ZG, Krysenko DA, J. Water Chem. Technol., 30, 85 (2005)

[4] Han RP, Zou WH, Li HK, Li YH, Shi J, J. Hazard. Mater., 137(2), 934 (2006)

[5] Han R, Zou W, Wang Y, Zhu L, J. Environ. Radioactiv., 93, 127 (2007)

[6] Zou W, Han R, Chen Z, Jinghua Z, Shi J, Colloids Surf. A: Physicochem. Eng. Asp., 279, 238 (2006)

[7] Tarasevich YI, Pollyakov VE, Ivanova ZG, Krysenko DA, Phys. Chem. Water Treat. Process., 30, 159 (2008)

[8] Falamaki C, Mohammadi A, Sohrabi M, Colloids Surf. A: Physicochem. Eng. Asp., 264, 31 (2004)

[9] Villinski JE, O’Day PA, Corley TL, Environ. Sci. Technol., 35, 1157 (2001)

[10] Treybal RE, Mass Transfer Operations, 3rd edition, International Student Edition (1981)

[11] Roberts GW, Chemical Reactions and Chemical Reactors, John Wiley & Sons (2009)

[12] Seader JD, Henley EJ, Separation Process Principles, John Wiley & Sons (2006)

[13] Falamaki C, Sohrabi M, Talebi G, Chem. Eng. Technol., 24(5), 501 (2001)