TY - JOUR
T1 - Effect of the magnetic core size of amino-functionalized Fe3O4-mesoporous SiO2 core-shell nanoparticles on the removal of heavy metal ions
AU - Jin, Suyue
AU - Park, Bum Chul
AU - Ham, Woo Seung
AU - Pan, Lijun
AU - Kim, Young Keun
N1 - Funding Information:
This research was supported by the National Research Foundation of Korea (No. 2014M3A7B4052193 , No. 2015R1A2A1A15053002 ). Appendix A
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/10/20
Y1 - 2017/10/20
N2 - Magnetite (Fe3O4)-mesoporous silica (mSiO2) core-shell nanoparticles are attractive heavy metal ion adsorbents. However, most studies have focused on the use of superparamagnetic Fe3O4 nanoparticles as core materials, resulting in low magnetic field responses due to their low susceptibility and saturation magnetization (Ms) values. Here, we report the synthesis, microstructure, and properties of ferrimagnetic Fe3O4-mSiO2 core-shell nanoparticles, focusing on the effects of the magnetic core size on their removal efficiency. We analyzed the magnetic properties and structural changes of the surface according to the magnetic core size and elucidated the correlation with the removal efficiency of heavy metal ions. Fe3O4 cores with diameters of 103, 123, or 207 nm were synthesized by a modified polyol method, while the silica layer with a porous structure was coated using a sol-gel reaction. Amino-functionalized ferromagnetic Fe3O4-mSiO2 nanoparticles with different core sizes exhibited a faster and more efficient removal behavior of heavy metal ions than other reported superparamagnetic nanoparticles. The highest removal capacity of 84.4 mg g−1 for Cu2+ ions was observed with the nanoparticles having the largest specific surface area of 483.78 m2 g−1.
AB - Magnetite (Fe3O4)-mesoporous silica (mSiO2) core-shell nanoparticles are attractive heavy metal ion adsorbents. However, most studies have focused on the use of superparamagnetic Fe3O4 nanoparticles as core materials, resulting in low magnetic field responses due to their low susceptibility and saturation magnetization (Ms) values. Here, we report the synthesis, microstructure, and properties of ferrimagnetic Fe3O4-mSiO2 core-shell nanoparticles, focusing on the effects of the magnetic core size on their removal efficiency. We analyzed the magnetic properties and structural changes of the surface according to the magnetic core size and elucidated the correlation with the removal efficiency of heavy metal ions. Fe3O4 cores with diameters of 103, 123, or 207 nm were synthesized by a modified polyol method, while the silica layer with a porous structure was coated using a sol-gel reaction. Amino-functionalized ferromagnetic Fe3O4-mSiO2 nanoparticles with different core sizes exhibited a faster and more efficient removal behavior of heavy metal ions than other reported superparamagnetic nanoparticles. The highest removal capacity of 84.4 mg g−1 for Cu2+ ions was observed with the nanoparticles having the largest specific surface area of 483.78 m2 g−1.
KW - Ferrimagnetic property
KW - Magnetic nanoparticle
KW - Mesoporous silica
KW - Metal ion adsorption
KW - Specific surface area
KW - Surface modification
UR - http://www.scopus.com/inward/record.url?scp=85027882764&partnerID=8YFLogxK
U2 - 10.1016/j.colsurfa.2017.07.086
DO - 10.1016/j.colsurfa.2017.07.086
M3 - Article
AN - SCOPUS:85027882764
SN - 0927-7757
VL - 531
SP - 133
EP - 140
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
ER -