Kinetics, equilibrium and thermodynamics studies of arsenate adsorption from aqueous solutions onto iron hydroxide

T. Mahmood, S. U. Din, A. Naeem, S. Tasleem, Absar Alum, S. Mustafa

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

This paper reports the equilibrium, kinetics and thermodynamic studies of arsenate adsorption onto freshly precipitated iron hydroxide. Adsorption of arsenate onto iron hydroxide depends on arsenate concentration, contact time and temperature. The intrapartical diffusion model indicates that both the film and intrapartical diffusion control arsenate adsorption on iron hydroxide. The values of activation energies (Ea) indicate the chemical nature of adsorption accompanied by diffusion controlled processes as the rate limiting step. The endothermic nature of the adsorption process suggests that adsorption reaction consumes energy. The negative values of δS# can be assigned to decreased randomness at the solid liquid interface.

Original languageEnglish (US)
Pages (from-to)3234-3242
Number of pages9
JournalJournal of Industrial and Engineering Chemistry
Volume20
Issue number5
DOIs
StatePublished - Sep 25 2014

Keywords

  • Arsenate
  • Film diffusion
  • Metal oxide
  • Sorption

ASJC Scopus subject areas

  • Chemical Engineering(all)

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