Recently, a series of interesting magnetic photocatalysts have
been successfully developed. For example, Yin et al. reported the
synthesis of (c-Fe2O3@SiO2)@TiO2 hybrid nanoparticles and its
photodegradation of methylene blue [21]. Shchukin et al. prepared
Zn0.35Ni0.65Fe2O4/SiO2/TiO2 nanoparticles, which showed a high
photoreactivity towards the oxidation of oxalic acid [20]. Carbon
coating was carried out by heating Fe3O4/SiO2/TiO2 under nitrogen
atmosphere in presence of PVA (Polyvinyl alcohol) as source of carbon
with simultaneous adsorption and oxidation [22]. Agglomerated
TiO2 particles were deposited on silica coated c-Fe2O3 by
mixing them and followed by calcination [23]. Lee et al. prepared
hard magnetic photocatalyst of barium ferrite/silica/titania and
found that the recycled composite presented photocatalytic activity
comparable to that of fresh composite [24]. However, how to attach
titania crystals onto the surface of silica surface firmly
through an easy process is still a challenge. There are many advantages
of connecting TiO2 catalyst to the support surface through
strong interaction, such as covalent bonds. For example, the magnetic
catalyst can be efficiently recovered by external magnetic
fields for many cycles without significant loss of either materials
or photocatalytic activity; and the loading of TiO2 in the composite
can be precisely controlled by experimental process
Recently, a series of interesting magnetic photocatalysts have
been successfully developed. For example, Yin et al. reported the
synthesis of (c-Fe2O3@SiO2)@TiO2 hybrid nanoparticles and its
photodegradation of methylene blue [21]. Shchukin et al. prepared
Zn0.35Ni0.65Fe2O4/SiO2/TiO2 nanoparticles, which showed a high
photoreactivity towards the oxidation of oxalic acid [20]. Carbon
coating was carried out by heating Fe3O4/SiO2/TiO2 under nitrogen
atmosphere in presence of PVA (Polyvinyl alcohol) as source of carbon
with simultaneous adsorption and oxidation [22]. Agglomerated
TiO2 particles were deposited on silica coated c-Fe2O3 by
mixing them and followed by calcination [23]. Lee et al. prepared
hard magnetic photocatalyst of barium ferrite/silica/titania and
found that the recycled composite presented photocatalytic activity
comparable to that of fresh composite [24]. However, how to attach
titania crystals onto the surface of silica surface firmly
through an easy process is still a challenge. There are many advantages
of connecting TiO2 catalyst to the support surface through
strong interaction, such as covalent bonds. For example, the magnetic
catalyst can be efficiently recovered by external magnetic
fields for many cycles without significant loss of either materials
or photocatalytic activity; and the loading of TiO2 in the composite
can be precisely controlled by experimental process
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