2.2. Characterization
The morphology of the SH-mSi@Fe3O4 was observed through
a scanning electron microscopy (Hitachi S-3000N) equipped with
an energy dispersive X-ray spectroscope (EDS) and a transmission
electron microscopy (Hitachi H-800) performed at an accelerating
voltage of 100 kV. A Fourier transform infrared (FT-IR) spectrometry
performed on 80OOs with KBr disks of powdered samples was
used to identify the functional groups of SH-mSiO2@Fe3O4. Powder
X-ray diffraction pattern of the material was recorded with
a PANalytical X’Pert Pro X-ray diffractometer using Cu-K radiation
over 2 range from 1◦ to 10◦. The N2 adsorption–desorption
isotherm was determined using a Micromeritics ASAP-2000 at 77 K
after the adsorbent was dehydrated and degassed at 120 ◦C for
3 h. The surface area and the pore distribution were calculated by
Brunauer–Emmett–Teller (BET) and Barret–Joyner–Halenda (BJH)
equations. The magnetic property was measured using a magnetometer
(NIM-200C, National Institute of Metrology, China) at room
temperature.