Adsorption isotherms and kinetics of methylene blue on a low-cost adsorbent recovered from a spent catalyst of vinyl acetate synthesis

Zhengyong Zhang, Zebiao Zhang, Y. Fernández, J. A. Menéndez, Hao Niu, Jinhui Peng*, Libo Zhang, Shenghui Guo

*Corresponding author for this work

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

A regenerated activated carbon used as catalyst support in the synthesis of vinyl acetate has been tested as a low-cost adsorbent for the removal of dyes. After a thorough textural characterization of the regenerated activated carbon, its adsorption isotherms and kinetics were determined using methylene blue as model compound at different initial concentrations. Both Langmuir and Freundlich isotherm models were developed and then compared. It was found that the equilibrium data were best represented by the Langmuir isotherm model. The kinetic data were fitted to pseudo-first-order, pseudo-second-order and intraparticle diffusion models, and it was found that the best fitting corresponded to the pseudo-second-order kinetic model. The results showed that this novel adsorbent had a high adsorption capacity, making it suitable for use in the treatment of methylene blue enriched wastewater.

Original languageEnglish
Pages (from-to)2569-2576
Number of pages8
JournalApplied Surface Science
Volume256
Issue number8
DOIs
Publication statusPrint publication - 1 Feb 2010
Externally publishedYes

Keywords

  • Adsorption isotherm
  • Basic dye
  • Kinetic
  • Regenerated activated carbon
  • Spent catalyst

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