Equilibrium and dynamic ion exchange studies of Cr<sup>3+</sup> on zeolites NaA and NaX

Authors

  • Maria Angélica Simões Dornellas de Barros UEM
  • Andréia Soares Zola UEM
  • Pedro Augusto Arroyo UEM
  • Eduardo Falabella Sousa-Aguiar UFRJ
  • Célia Regina Granhen Tavares UEM

DOI:

https://doi.org/10.4025/actascitechnol.v24i0.2476

Keywords:

troca iônica de cromo, leito fixo, zeólita, isoterma, curva de ruptura

Abstract

In this paper, the chromium uptake in zeolites NaA and NaX was investigated in equilibrium condition and in dynamic systems at 30oC. The separation factors, obtained from the equilibrium data, were very similar to the isotherms Cr-NaA e Cr-NaX, which indicates that, in equilibrium conditions both zeolites remove similar quantities of chromium ions. For the dynamic runs, it was observed that the large size of hydrated chromium ion inhibited its exchange in all zeolite sites causing huge differences in the breakthrough curves. The dynamic data were used to estimate some mass transfer parameters such as the length of unused bed, operational ratio and dimensionless variance for various flow rates. Based on the breakthrough results, the optimal condition for column operation was 11 mL/min for zeolite NaA and 9 mL/min for zeolite NaX. Moreover, through the dynamic capacity of the column, it was concluded that the zeolite NaX has been more efficient for dynamic chromium uptake due to the larger aperture of its cages.

Downloads

Download data is not yet available.

Author Biography

Maria Angélica Simões Dornellas de Barros, UEM

Possui graduação em Engenharia Quí­mica pela Universidade Estadual de Maringá (1992) , mestrado em Engenharia Quí­mica pela Universidade Estadual de Maringá (1996) e doutorado em Programa de Pós Graduação Em Engenharia Quí­mica pela Universidade Estadual de Maringá (2003) . Atualmente é Professor adjunto A da Universidade Estadual de Maringá. Tem experiência na área de Engenharia Quí­mica , com ênfase em Tecnologia Quí­mica. Atuando principalmente nos seguintes temas: cromo, troca iônica, Isotermas, leito fixo, Efluentes e curtume Currí­culo Lattes

Downloads

Published

2008-04-22

How to Cite

Barros, M. A. S. D. de, Zola, A. S., Arroyo, P. A., Sousa-Aguiar, E. F., & Tavares, C. R. G. (2008). Equilibrium and dynamic ion exchange studies of Cr<sup>3+</sup> on zeolites NaA and NaX. Acta Scientiarum. Technology, 24, 1619–1625. https://doi.org/10.4025/actascitechnol.v24i0.2476

Issue

Vol. 24 (2002)

Section

Chemistry

License

DECLARATION OF ORIGINALITY AND COPYRIGHTS

I Declare that current article is original and has not been submitted for publication, in part or in whole, to any other national or international journal. 

The copyrights belong exclusively to the authors. Published content is licensed under Creative Commons Attribution 4.0 (CC BY 4.0) guidelines, which allows sharing (copy and distribution of the material in any medium or format) and adaptation (remix, transform, and build upon the material) for any purpose, even commercially, under the terms of attribution.

Read this link for further information on how to use CC BY 4.0 properly.

 

Most read articles by the same author(s)

1 2 3 > >>