3.3 FTIR Analysis
Figure (6) shows the synthesized magnetic metal-organic frameworks of
the FTIR spectrum. In all three spectra of magnetic metal-organic
frameworks
(NiFe2O4@SiO2@ HKUST-1)
containing different percentages of nickel ferrite. Many peaks observed
in the spectrum of nickel ferrite magnetic nanocomposites in silica
substrate (NiFe2O4@SiO2)
and the spectrum of metal-organic framework (HKUST-1) are reported and
overlap [40,53]. This indicates the formation of all three magnetic
metal-organic frameworks
(NiFe2O4@SiO2@ HKUST-1)
with different percentages of nickel ferrite. Presence of peaks in the
area of 1580-1709 cm-1 due to the presence of
carboxyl (COO-) groups in the connector (BTC) and the peak in the
1163-700 cm-1 region corresponds to the double bond (C
= C) of the aromatic group in the binder (BTC) belonging to the copper
metal-organic framework (HKUST-1). In addition, the presence of peaks in
the area of 685 cm-1 and 744 cm-1indicates silica networks and group tensile vibrations (Si-O-Si). The
presence of a peak in the area of 476 cm-1 related
to asymmetric tensile vibrations (Cu-O) and the peak in the region of
524 cm-1 is related to tensile vibrations (Fe-O),
which indicate the accuracy of the synthesis of all three compounds. It
is clear that the intensity of the peaks related to the vibrations of
Si-O, Cu-O, Si-O-Fe in the sample of the magnetic metal-organic
frameworks containing 50% by weight of nickel ferrite has increased. A
summary of the peaks in the infrared spectrum of the magnetic
metal-organic nanocomposite framework
(NiFe2O4@ SiO2@ HKUST-1)
is given in Table 3 [51-53].
Table 3: Corresponding peaks and bonds in the FTIR spectrum of a
nanocomposite sample of a magnetic metal-organic framework
(NiFe2O4@SiO2@ HKUST-1).