Abstract
Presence of Fluoride in water is safe and effective when used as directed, but it can be harmful at high doses. In the present paper SiO2 nanoparticles as a adsorbent is used for removal of fluoride from aqueous solution. The effect of various operating parameters such as initial concentration of F-, Contact time, adsorbent dosage and pH were investigated. Equilibrium isotherms were used to identify the possible mechanism of the adsorption process. Maximum adsorption capacity of the SiO2 nanoparticles was 49.95 mg/g at PH=6, contact time 20 min, initial concentration of 25 mg/L, and 25±2 ◦C temperatures, when 99.4% of Fwere removed. The adsorption equilibriums were analyzed by Langmuir and Freundlich isotherm models. It was found that the data fitted to Langmuir (R2=0.992) better than Freundlich (R2=0.943) model. Kinetic analyses were conducted using pseudo first-and second-order models. The regression results showed that the adsorption kinetics was more accurately represented by a pseudo second-order model. These results indicate that SiO2 nanoparticles can be used as an effective, low-cost adsorbent to remove fluoride from aqueous solution.
Highlights
Fluoride pollution in the environment occurs through two different channels which are natural and anthropogenic sources[1]
According to the World Health Organization (WHO) the maximum allowable concentration of fluoride is 1.5 mg L−1.(6) For these reasons, the removal of the excess fluoride from waters and wastewaters is important in terms of protection of public health and environment[7]
From the present result it is concluded that SiO2 nanoparticles as a adsorbent are promising materials for F- removal
Summary
Fluoride pollution in the environment occurs through two different channels which are natural and anthropogenic sources[1]. According to the World Health Organization (WHO) the maximum allowable concentration of fluoride is 1.5 mg L−1.(6) For these reasons, the removal of the excess fluoride from waters and wastewaters is important in terms of protection of public health and environment[7]. Many methods such as adsorption, ion exchange, precipitation, Donnan dialysis, electrodialysis, reverse osmosis, nanofiltration and ultrafiltration have been investigated to remove excessive fluoride from water[8, 9]. There is a growing interest in the application of nanoparticles as sorbents[14]
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