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Korean Journal of Chemical Engineering

, Volume 34, Issue 2, pp 454–462 | Cite as

Optimization of fluoride adsorption onto natural and modified pumice using response surface methodology: Isotherm, kinetic and thermodynamic studies

  • Mohammad Hadi Dehghani
  • Maryam Faraji
  • Amir Mohammadi
  • Hossein Kamani
Separation Technology, Thermodynamics

Abstract

Natural pumice (NP), FeCl3·6H2O modified pumice (FEMP) and hexadecyl trimethyl ammonium bromide (HDTM.Br) modified pumice (HMP) were used for fluoride adsorption. The effect of pH (3-11), initial concentration (2-15mg/L), and adsorbent dosage (0.2-0.8 g/L) on the defluoridation was optimized by using central composite design (CCD) in the response surface methodology (RSM). Results showed optimum condition in the pH=3, initial concentration=2mg/L, and adsorbent dosage=0.71, 0.75, 0.70 g/L with the maximum removal efficiency of 9.39, 76.45, and 95.09% for NP, FEMP, and HMP, respectively. The adsorption equilibrium and kinetic data was in good agreement with Freundlich and pseudo-second order reaction. Thermodynamic parameters indicated a non-spontaneous nature for NP and spontaneous nature for FEMP and HMP. Positive enthalpy illustrated the endothermic nature of the process. On the basis of results, modification of pumice led to an increase in the fluoride removal efficiency.

Keywords

Thermodynamic Central Composite Design Response Surface Methodology Fluoride Adsorption Pumice Modification 

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Copyright information

© Korean Institute of Chemical Engineers, Seoul, Korea 2017

Authors and Affiliations

  1. 1.Department of Environmental Health Engineering, School of Public HealthTehran University of Medical SciencesTehranIran
  2. 2.Center for Solid Waste Research, Institute for Environmental ResearchTehran University of Medical SciencesTehranIran
  3. 3.Department of Environmental Health Engineering, School of Public HealthShahid Sadoughi University of Medical SciencesYazdIran
  4. 4.Health Promotion Research CenterZahedan University of Medical SciencesZahedanIran

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