Title : ( Nitrate adsorption using green iron oxide nanoparticles synthesized by Eucalyptus leaf extracts: Kinetics and effects of pH, KCl salt, and anions competition )
Authors: Ehsan Khoshkalam , Amir Fotovat , Akram Halajnia , Hossein Kazemian , Hossein Eshghi ,Abstract
This research investigated the colloidal stability and reactivity of green iron oxide nanoparticles for removing NO3 – ions from polluted water. These nanoparticles were synthesized by Eucalyptus globulus leaf extract (EL-Fe NPs). Transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and dynamic light scattering (DLS) were utilized to characterize EL-Fe NPs. The effect of contact time, different pH, KCl salt, and anions (PO4 3_, SO4 2_, HCO3 – , Cl_), on NO3 – adsorption using EL-Fe NPs were evaluated. Based on the results, Fe3O4 and a-Fe2O3 nanoparticles were encapsulated by polyphenols and have irregular nanoparticulate structures. After 30 min, the maximum adsorption capacity of 1.5 g L_1 EL-Fe NPs dispersed in 50 mg L_1 NO3 – solution with a pH of 3.7 was acquired at about 12.91 mg/g. Adsorption of NO3 – on EL-Fe NPs was strongly pH dependent, and at pH > 6.6 no significant adsorption occurred. KCl salt by agglomeration of EL-Fe NPs, the mean particle size varied between 25.6 nm and 63 nm, and NO3 – adsorption decreased dramatically. It was observed that EL-Fe NPs significant affinity to adsorb PO4 3_ ions. As a result, no significant adsorption of NO3 – ions onto EL-Fe NPs was detected in the presence of phosphate ions. The experimental data were reasonably fit to a pseudo-second-order kinetic model (R2 = 0.992), which can be concluded that the primary mechanism of NO3 – adsorption is electrostatic. This work indicated that the removal of NO3 – using EL-Fe NPs was influenced by the type and concentration of accompanying cations and anions.
Keywords
Adsorption Agglomeration Engineered nanoparticles Green chemistry Mechanism Water pollution@article{paperid:1093358,
author = {Khoshkalam, Ehsan and Fotovat, Amir and Halajnia, Akram and حسین کاظمیان and Eshghi, Hossein},
title = {Nitrate adsorption using green iron oxide nanoparticles synthesized by Eucalyptus leaf extracts: Kinetics and effects of pH, KCl salt, and anions competition},
journal = {Journal of Molecular Liquids},
year = {2023},
volume = {375},
month = {April},
issn = {0167-7322},
pages = {121366--121377},
numpages = {11},
keywords = {Adsorption
Agglomeration
Engineered nanoparticles
Green chemistry
Mechanism
Water pollution},
}
%0 Journal Article
%T Nitrate adsorption using green iron oxide nanoparticles synthesized by Eucalyptus leaf extracts: Kinetics and effects of pH, KCl salt, and anions competition
%A Khoshkalam, Ehsan
%A Fotovat, Amir
%A Halajnia, Akram
%A حسین کاظمیان
%A Eshghi, Hossein
%J Journal of Molecular Liquids
%@ 0167-7322
%D 2023