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Magnetic hydroxyapatite nanoparticles: An efficient adsorbent for the separation and removal of nitrate and nitrite ions from environmental samples
Author(s) -
Ghasemi Ensieh,
Sillanpää Mika
Publication year - 2015
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201400928
Subject(s) - adsorption , aqueous solution , nanoparticle , magnetic nanoparticles , fourier transform infrared spectroscopy , nitrate , nitrite , magnetic separation , materials science , scanning electron microscope , response surface methodology , chemical engineering , chemistry , nuclear chemistry , nanotechnology , chromatography , metallurgy , composite material , organic chemistry , engineering
A novel type of magnetic nanosorbent, hydroxyapatite‐coated Fe 2 O 3 nanoparticles was synthesized and used for the adsorption and removal of nitrite and nitrate ions from environmental samples. The properties of synthesized magnetic nanoparticles were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and X‐ray powder diffraction. After the adsorption process, the separation of γ‐Fe 2 O 3 @hydroxyapatite nanoparticles from the aqueous solution was simply achieved by applying an external magnetic field. The effects of different variables on the adsorption efficiency were studied simultaneously using an experimental design. The variables of interest were amount of magnetic hydroxyapatite nanoparticles, sample volume, pH, stirring rate, adsorption time, and temperature. The experimental parameters were optimized using a Box–Behnken design and response surface methodology after a Plackett–Burman screening design. Under the optimum conditions, the adsorption efficiencies of magnetic hydroxyapatite nanoparticles adsorbents toward NO 3 − and NO 2 − ions (100 mg/L) were in the range of 93–101%. The results revealed that the magnetic hydroxyapatite nanoparticles adsorbent could be used as a simple, efficient, and cost‐effective material for the removal of nitrate and nitrite ions from environmental water and soil samples.