In order to investigate the interface bonding in the Fe3O4/SiO2/
TiO2 composite, FTIR spectrum of sample C2 was measured and
shown in Fig. 4. A stretching vibration at the wave number of
950 cm1 of Ti–O–Si was detected, proving that TiO2 catalysts
strongly attached to the surface of silica by covalent bonds. The peak at the wave number about 1100 cm1 corresponds to the
asymmetric vibration of Si–O–Si [5]. While the bands at about
800 and 460 cm1 can be assigned to the symmetric stretching
and the deformation modes of Si–O–Si, respectively [27]. The
absorption bands at around 3440 and 1640 cm1 are attributed
to the stretching modes of water and hydroxyl [28], facilitating
oxygen adsorption for photocatalytic activity of TiO2. The vibration
located at 500–800 cm1 originates from Ti–O–Ti [5]. In the spectrum,
we could not find any trace of PAA, indicating it had completely
decomposed during calcination process.
In order to investigate the interface bonding in the Fe3O4/SiO2/
TiO2 composite, FTIR spectrum of sample C2 was measured and
shown in Fig. 4. A stretching vibration at the wave number of
950 cm1 of Ti–O–Si was detected, proving that TiO2 catalysts
strongly attached to the surface of silica by covalent bonds. The peak at the wave number about 1100 cm1 corresponds to the
asymmetric vibration of Si–O–Si [5]. While the bands at about
800 and 460 cm1 can be assigned to the symmetric stretching
and the deformation modes of Si–O–Si, respectively [27]. The
absorption bands at around 3440 and 1640 cm1 are attributed
to the stretching modes of water and hydroxyl [28], facilitating
oxygen adsorption for photocatalytic activity of TiO2. The vibration
located at 500–800 cm1 originates from Ti–O–Ti [5]. In the spectrum,
we could not find any trace of PAA, indicating it had completely
decomposed during calcination process.
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