tailieunhanh - A study on kinetic and thermodynamic adsorption of fluoride from aqueous solution onto aluminium hydroxide coated rice husk ash
Thermodynamic parameters (∆G o and ∆H o ) in the range of temperature from 30 to 70 oC 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 and after 2 hours of treating with the dose of ÷ , the concentration of fluoride in the samples decreased to ÷ , that met acceptable limit of WHO. | Journal of Science and Technology 54 (6) (2016) 737-747 DOI: A STUDY ON KINETIC AND THERMODYNAMIC ADSORPTION OF FLUORIDE FROM AQUEOUS SOLUTION ONTO ALUMINIUM HYDROXIDE COATED RICE HUSK ASH Tran Ngoc Tuyen1, Nguyen Duc Vu Quyen1, Ho Van Minh Hai1, Tran Ngoc Quang2, Hoang Trong Sy3, Nguyen Trong Liem4 1 2 Department of Chemistry, Hue University of Sciences, 77 Nguyen Hue Str, Hue city Department of Environmental Science, Hue University of Sciences, 77 Nguyen Hue Str., Hue 3 Hue University of Medicine and Pharmacy, 06 Ngo Quyen Str, Hue city 4 Medical Center, Ninhhoa district, Khanhhoa province * Email: trntuyen@ Received: 20 January 2016; Accepted for publication: 2 April 2016 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 . 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 (∆Go and ∆Ho) in the range of temperature from 30 to 70 oC 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 and after 2 hours of treating with the dose of ÷ , the concentration of fluoride in the samples decreased to ÷ , that met acceptable limit of WHO. Keywords: aluminium hydroxide coated rice husk ash, adsorption, fluoride. 1. INTRODUCTION With human and animals body, fluorine is an integral element which plays the role of regulating the metabolism of calcium and phosphorus. It is necessary .
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