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Adsorptive removal of arsenic from aqueous solutions using magnetite nanoparticles and silica‐coated magnetite nanoparticles
Author(s) -
JamaliBehnam Farideh,
Najafpoor Ali Asghar,
Davoudi Mojtaba,
RohaniBastami Tahereh,
Alidadi Hossein,
Esmaily Habibollah,
Dolatabadi Maryam
Publication year - 2017
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12751
Subject(s) - magnetite , sorption , nanoparticle , aqueous solution , arsenic , magnetic nanoparticles , fourier transform infrared spectroscopy , materials science , point of zero charge , langmuir adsorption model , adsorption , chemical engineering , magnetic separation , nuclear chemistry , nanotechnology , chemistry , metallurgy , organic chemistry , engineering
Magnetite nanosorbents are known with high sorption capacity and ease of solid phase separation from surrounding liquid by the imposed external magnetic field. In this study, magnetite nanoparticles (MNPs) and silica‐coated magnetite nanoparticles (Si‐MNPs) were prepared and used for the removal of arsenic (III) from aqueous solutions. The nanosorbents were characterized by transmission electron microscope, X‐ray diffraction, Fourier transform infrared spectroscopy, and vibrating sample magnetometer. The spherical Fe 3 O 4 nanoparticles in diameter of about 100 nm and SiO 2 shells of 12 nm were formed. The saturation magnetization was found to be 78 and 58 e mug –1 for MNPs and Si‐MNPs, respectively. Under optimal conditions, both nanosorbents were very efficient for arsenite uptake (removal efficiency ≥99%). The highest removal percentage was obtained near PZC of nanosorbents where the net surface charge was zero. The MNPs exhibited higher sorption capacities in comparison with Si‐MNPs although they tended to be agglomerated in higher applied doses. The kinetic of experiments indicated the best fit to the pseudo‐second order model. Furthermore, the experimental data were best described by the Langmuir model. This study demonstrated the effectiveness of bare and silica coated magnetic nanoparticles to remove trace concentrations of arsenic (III) in water environment. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 951–960, 2018