Application of response surface methodology for optimization of fluoride adsorption from aqueous solution using MgO-based nanocomposites

Document Type: Original Research Paper

Authors

1 Department of Environmental Health, Zabol University of Medical Sciences, Zabol, Iran

2 Assistant professor of Environmental Health, Infectious Diseases and Tropical Medicine Research Center, Resistant 8 Tuberculosis Institute, Zahedan University of Medical Sciences, Zahedan, Iran

3 Department of Physics, University of Zabol, Zabol, P. O. Box. 98613-35856, Islamic Republic of Iran

4 MSc of Environmental Health, Kerman University of Medical Sciences, Kerman, Iran

5 Department of Chemistry, University of Dhaka, Dhaka 1000, Bangladesh

10.22034/jna.2020.677399

Abstract

Deleterious effect of high concentration fluoride in water resources on the health
of human. The MgO supported Fe-Co-Mn nanoparticles were produced via coprecipitation
method and characterized by SEM and FTIR techniques. In the work,
the adsorption process optimization was performed by response surface modeling
with the help of Minitab 16 software. The effect of independent parameters such
as pH ( 3-11), the initial dose (0.02-0.1 g/L), the initial concentration of the fluoride
(10-50 mg/L) and reaction time (30-180 min) were optimized to obtain the best
response of fluoride removal using the statistical Box-Behnken in response
surface modeling procedure. Conditions for the pH(5), the initial concentration
of nanoparticle (0.05 g/L), the initial concentration of fluoride (50 mg/L) and the
process time(90 min) were obtained as Min respectively. Under these conditions,
the removal efficiency of the fluoride by MgO capped Fe-Co-Mn nanoparticles
equal to 84.64% were achieved. ANONA high correlation coefficients for the
proposed model was also obtained (adjusted –R2=0.9993 and R2=0.9984). The
equilibrium data were analyzed using Langmuir, Freundlich, Temkin and Dubinin-
Radushkevich isotherm models. The Langmuir model was found to be describing
the data. Kinetic studies showed that the adsorption followed a pseudo-second
order reaction.

Keywords