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N 2 and O 2 adsorption properties of an Iranian clinoptilolite-rich tuff in the original and pre-exchanged forms

Colloids and Surfaces A: Physicochemical and Engineering Aspects, 1 October 2004, Vol.246(1-3), pp.31-37 [Peer Reviewed Journal]

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  • Title:
    N 2 and O 2 adsorption properties of an Iranian clinoptilolite-rich tuff in the original and pre-exchanged forms
  • Author: Falamaki, C. ; Mohammadi, A. ; Sohrabi, M.
  • Found In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, 1 October 2004, Vol.246(1-3), pp.31-37 [Peer Reviewed Journal]
  • Subjects: Adsorption Modeling ; Clinoptilolite ; Ion-Exchange
  • Rights: Copyright 2017 Elsevier B.V., All rights reserved.
  • Description: The adsorption characteristics of an Iranian clinoptilolite-rich tuff from the Semnan region, both in the unmodified and K + , Na + , Ca 2+ and Mg 2+ exchanged forms has been investigated. The effect of zeolite agglomerate particle size (d < 45 μm and d = 4 mm) on the adsorption isotherms has been studied. Large ion-exchanged particles exhibit significant less saturation adsorption because of less nanopore connectivity due to minimal residues of unwashed salts. Using the Dubinin-Astakhov model, the optimum values of the structural parameter, characteristic energy, saturation capacity and pore volume have been evaluated. K-cp possesses the largest structural parameter (n = 2.3 for coarse and n=2.5 for the fine powder). Also, this form has the highest selectivity (amount N 2 adsorbed/amount O 2 adsorbed), i.e., 1.61 and 1.98 for the fine and coarse powders, respectively. The confinement effect is significant in O 2 adsorption for the ion-exchanged forms, resulting in considerable...
  • Identifier: ISSN: 09277757 ; DOI: 10.1016/j.colsurfa.2004.07.015

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