화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.20, No.5, 3234-3242, September, 2014
DOI10.1016/j.jiec.2013.12.004  Export Citation
Kinetics, equilibrium and thermodynamics studies of arsenate adsorption from aqueous solutions onto iron hydroxide
T. Mahmood, S.U. Din, A. Naeem†, S. Tasleem, A. Alum1, and S. Mustafa
  • National Center of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan
  • 1School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ 85287, USA
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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 △S# can be assigned to decreased randomness at the solid liquid interface.
Keywords:Sorption;Arsenate;Metal oxide;Film diffusion
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