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).