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Fatemeh Elmi

Fatemeh Elmi

Academic rank: Associate Professor
ORCID:
Education: PhD.
ScopusId:
Faculty: Faculty of Marine and Oceanic Sciences
Address:
Phone: 01135305124

Research

Title
Removal and recovery of strontium (Sr(II)) from seawater by Fe3O4/MnO2/ fulvic acid nanocomposite
Type
JournalPaper
Keywords
seawater, strontuium, extraction, fluvic acid, mangenese oxide, iron oxide
Year
2019
Journal MARINE CHEMISTRY
DOI
Researchers Mojtaba Shokrollah Zadeh Taleshi ، nayyereh ghaeni ، Fatemeh Elmi

Abstract

In this study, Fe3O4/MnO2/FA nanocomposite was synthesized as a low cost adsorbent with high adsorption capacity, desorption efficiency and reusability for Sr(II) extraction from seawater. FT-IR, FESEM-EDS, XRD, VSM and BET experiments were used to characterize the composite. Sr(II) adsorption onto Fe3O4/MnO2/FA followed a pseudo-first-order kinetic model and was well fitted with the Langmuir isotherm model. Fe3O4/MnO2/FA has demonstrated an excellent adsorption capacity of 227.3 mg/g for Sr(II) ions at 25 °C and pH 8. The composite showed high selective uptake of Sr(II) in the presence of cations Na, Mg and Ca. However, Ca ions reduced the Sr (II) uptake from 49.1 to 41.0 mg/g at 600 mg/L Ca. Sr(II) desorption was performed using 0.1M HCl which showed an excellent desorption efficiency. In natural seawater containing 9.4 mg/L Sr(II), without changing the physicochemical conditions, Fe3O4/MnO2/FA composite showed 6.4 mg/g of Sr(II) adsorption, which leads to save time and energy consumption.