Facile and Room Temperature Synthesis of Superparamagnetic Fe₃O₄/C Core/Shell Nanoparticles for Efficient Removal of Pb(II) From Aqueous Solution

Abstract

In this work, superparamagnetic Fe3O4/C core/shell nanoparticles (NPs) were synthesized using a room‐temperature and green route combining co‐precipitation method, followed by hydrothermal process. The prepared nanoparticle was utilized as an adsorbent for the removal of Pb+2 ions from a wastewater. The effect of various parameters; such as pH, dose of adsorbent, contact time and concentration of lead ions on the adsorption capacity were examined in details. The adsorption capacity (qm) of Fe3O4/C NPs was estimated from the Langmuir isotherm curve and was found to be 244 mgg−1. Interestingly, the produced Fe3O4/C NPs exhibited a rapid removal of toxic lead metal ions from wastewater effluents and the adsorption kinetics is well described by pseudo‐second‐order model. Furthermore, the data of Pb2+ adsorption is best fit for the Langmuir model. Moreover, the Fe3O4/C core/shell NPs were recycled and reused for at least five times without a significant loss of adsorption efficiency.

Nanocarbon hybrid for simultaneous removal of arsenic, iron and manganese ions from aqueous solutions

“…The adsorption of heavy metals would be reduced as the protonation increased due to the electrostatic repulsion (Wang et al, 2014). On the other hand, at high pH, the negative surface charge creates electrostatic interactions that are favorable for cation ion adsorption (Ren et al, 2011;Sayed et al, 2019). Arsenic in natural waters is mainly found with its inorganic forms of As(III) (H 3 AsO 3 ) and/or As(V) (arsenic oxyanions such as H 3 AsO 4 , H 2 AsO 4and HAsO 3 2-) depending on the pH medium.…”

Synthesis and study of superparamagnetic Fe3O4/C core‐shells nanoparticles for Cd2+ adsorption

“…However, they have the disadvantage of low specific surface area and especially difficult to reuse. [ 5 ]…”

“…[ 8‐10 ] Among them, nanostructures with Fe 3 O 4 core and carbon shell with high chemical stability, non‐toxicity and low cost of synthesis are considered as potential adsorbent materials in removing heavy metal ions from polluted water sources. [ 5,10,11 ]…”

“…However, they have the disadvantage of low specific surface area and especially difficult to reuse. [5] In recent years, magnetic nano-adsorbents based on Fe3O4 have attracted interest in wastewater treatment because it has a large specific surface area and can be easily recovered by an external magnetic field. [6][7][8] Besides, many studies have demonstrated that creating the shell layer to protect Fe3O4 materials with organic or inorganic compounds helps to improve the adsorption efficiency because the shell layer helps inhibit the aggregation of the nanoparticles after application.…”

“…[8][9][10] Among them, nanostructures with Fe3O4 core and carbon shell with high chemical stability, non-toxicity and low cost of synthesis are considered as potential adsorbent materials in removing heavy metal ions from polluted water sources. [5,10,11] In this work, we report the results of structural characterization and Cd 2+ adsorption capacity of Fe3O4/C-EG materials, which were synthesized by the hydrothermal method.…”