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Article Abstract
The adsorption of fluoride from aqueous solution by lanthanum ferrite nanoparticles (LaFeO NPs) synthesized by the hydrothermal method has been investigated. This experimental study was conducted on a laboratory scale. The effects of various operating parameters such as pH (3-11), LaFeO NPs dosage (0.1-1.0 g/L), contact time (15-120 min), temperature (303-318 K), and initial concentration of fluoride (15-40 mg/L) on fluoride adsorption were studied. The results showed that under optimal conditions of fluoride concentration of 20 mg/L, pH of 5, LaFeO NPs dosage of 0.9 g/L, temperature of 308 K, and contact time of 60 min, maximum percentage removal of 94.75 % was obtained. The process of fluoride adsorption on LaFeO NPs was found to depend on the Freundlich adsorption and Koble-Corrigan isotherm models. The monolayer adsorption capacity of LaFeO NPs was 2.575 mg/g. The kinetic data fitted best into the pseudo-second-order model considering the values of the regression coefficients (r) and error functions used. The thermodynamics study indicated that the adsorption process was exothermic (Δ°< 0) and spontaneous (ΔG°< 0) in nature. It could be concluded that the synthesized LaFeONPs can be used as an effective adsorbent for fluoride ions removal from aqueous solutions.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6996013 | PMC |
| http://dx.doi.org/10.1016/j.mex.2020.100786 | DOI Listing |
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