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Investigation on Sorption of Fluoride in Water Using Rice Husk as an Adsorbent


Affiliations
1 Deptt. of Chemical Engineering, Bharati Vidyapeeth University, Pune-411 043, Maharashtra, India
2 Deptt. of Chemical Engineering, Priyadarshini Institute of Engineering and Technology, Nagpur-440 019, Maharashtra, India
 

The batch adsorption studies were undertaken to assess the suitability of inexpensive adsorbent prepared from agricultural waste, rice husk. The adsorbent was prepared by chemical impregnation method followed by physical activation. Static studies have aimed for investigation of fluoride removal efficiency under the varying conditions of the major parameters of adsorption, viz. pH, dose of adsorbent, rate of stirring, contact time and initial adsorbate concentration, and optimized by batch procedure in the mixture of known concentration of fluoride solution. The optimum sorbent dose was found to be 10g/L by varying the dose of adsorbent from 0 to 16g/L; equilibrium was achieved in 120 min for the optimum pH. It has been observed that the optimum adsorption takes place at lower pH by varying pH from 2, 4, 6, 8, 10. Maximum fluoride removal was observed to be 75% at optimum conditions. Freundlich as well as Langmuir isotherms were plotted and constants of isotherms were determined.

Keywords

Fluoride, Adsorption, Activated Alumina, Freundlich Isotherm, Langmuir Isotherm.
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  • Investigation on Sorption of Fluoride in Water Using Rice Husk as an Adsorbent

Abstract Views: 170  |  PDF Views: 0

Authors

Waheed S. Deshmukh
Deptt. of Chemical Engineering, Bharati Vidyapeeth University, Pune-411 043, Maharashtra, India
S. J. Attar
Deptt. of Chemical Engineering, Bharati Vidyapeeth University, Pune-411 043, Maharashtra, India
M. D. Waghmare
Deptt. of Chemical Engineering, Priyadarshini Institute of Engineering and Technology, Nagpur-440 019, Maharashtra, India

Abstract


The batch adsorption studies were undertaken to assess the suitability of inexpensive adsorbent prepared from agricultural waste, rice husk. The adsorbent was prepared by chemical impregnation method followed by physical activation. Static studies have aimed for investigation of fluoride removal efficiency under the varying conditions of the major parameters of adsorption, viz. pH, dose of adsorbent, rate of stirring, contact time and initial adsorbate concentration, and optimized by batch procedure in the mixture of known concentration of fluoride solution. The optimum sorbent dose was found to be 10g/L by varying the dose of adsorbent from 0 to 16g/L; equilibrium was achieved in 120 min for the optimum pH. It has been observed that the optimum adsorption takes place at lower pH by varying pH from 2, 4, 6, 8, 10. Maximum fluoride removal was observed to be 75% at optimum conditions. Freundlich as well as Langmuir isotherms were plotted and constants of isotherms were determined.

Keywords


Fluoride, Adsorption, Activated Alumina, Freundlich Isotherm, Langmuir Isotherm.