Synthesis of Magnetic Cobalt Ferrite Nanoparticles for the Removal of Excess Fluoride Ions From Aqueous Solutions



Masoudi F¹ ; Naghizadeh A² ; Kamranifar M¹ ; Mahvi AH³
Source: Fluoride Published:2020

Abstract

The aim of this study was to evaluate, using batch methodology, the effect of various parameters such as pH, adsorbent dose, contact time, magnetic fluoride concentration, and temperature on fluoride adsorption using cobalt ferrite nanoparticles (CoFe2 O4NPs). The adsorption parameters were determined by the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models and pseudo-first-order kinetics and pseudo-second-order kinetics. Finally, the thermodynamic parameters (∆H, ∆S, and ∆G) of fluoride adsorption on magnetic cobalt ferrite nanoparticles were considered. The results showed that in optimum conditions for fluoride adsorption by magnetic cobalt ferrite nanoparticles, pH=3, adsorbent dose=0.2 g/L, fluoride concentration=10 mg/L, contact time=10 min, the maximum absorption capacity is 8.75 mg/g. The adsorption process follows the Langmuir isotherm and pseudo-second-order kinetics. In the study of the thermodynamic results of the adsorption process, positive values of ∆S and ∆H and a negative value of ∆G were obtained. © 2020, ISFR, www.fluorideresearch.online, Dunedin, New Zealand.