A study on kinetic and thermodynamic adsorption of fluoride from aqueous solution onto aluminium hydroxide coated rice husk ash

Tran Ngoc Tuyen, Nguyen Duc Vu Quyen, Ho Van Minh Hai, Tran Ngoc Quang, Hoang Trong Sy, Nguyen Trong Liem
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Authors

  • Tran Ngoc Tuyen Department of Chemistry, Hue University of Sciences, 77 Nguyen Hue Str, Hue city, Viet Nam
  • Nguyen Duc Vu Quyen Department of Chemistry, Hue University of Sciences, 77 Nguyen Hue Str, Hue city, Viet Nam
  • Ho Van Minh Hai Department of Chemistry, Hue University of Sciences, 77 Nguyen Hue Str, Hue city, Viet Nam
  • Tran Ngoc Quang Department of Environmental Science, Hue University of Sciences, 77 Nguyen Hue Str., Hue, Viet Nam
  • Hoang Trong Sy Hue University of Medicine and Pharmacy, 06 Ngo Quyen Str, Hue city, Viet Nam
  • Nguyen Trong Liem Medical Center, Ninhhoa district, Khanhhoa province, Viet Nam

DOI:

https://doi.org/10.15625/0866-708X/54/6/7703

Keywords:

Aluminium hydroxide coated rice husk ash, adsorption, fluoride.

Abstract

The fluoride adsorption on aluminum hydroxide coated rice husk ash material (RHA/Al(OH)3) was demonstrated in this study. The isothermal data indicated that the Langmuir model well described the adsorption system with the maximum monolayer adsorption capacity of 8.2 mg.g-1. The kinetic results revealed that the pseudo-second-order rate model fitted the experiments data better than the pseudo-first-order one. Furthermore, the adsorption of fluoride onto this material may be the chemical adsorption. Thermodynamic parameters (DG and DH) in the range of temperature from 30 to 70oC showed that the adsorption was a spontaneous and an endothermic process. RHA/Al(OH)3 could be used for well-treatment of fluoride contaminated well-water sampling in Ninhhoa district (Khanhhoa province). With the initial content of fluoride of 6.1 mg.L-1 and after 2 hours of treating with the dose of 4.0 ¸ 7.0 g.L-1, the concentration of fluoride in the samples decreased to 0.5 ¸ 1.5 g.L-1, that met acceptable limit of WHO.

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Published

07-12-2016

How to Cite

[1]
T. N. Tuyen, N. D. V. Quyen, H. V. M. Hai, T. N. Quang, H. T. Sy, and N. T. Liem, “A study on kinetic and thermodynamic adsorption of fluoride from aqueous solution onto aluminium hydroxide coated rice husk ash”, Vietnam J. Sci. Technol., vol. 54, no. 6, pp. 737–747, Dec. 2016.

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