photocatalytic activity attributed to crystallinity and high rate of charge transfer in
layered structure Bi 2 MoO 6 . Zhang et al. (Huang et al. 2018) suggested that
nanosheets and microrods of Bi 2 MoO 6 were selectively synthesized via change of
pH of precursor solution in hydrothermal method and demonstrated efficient visible
light photocatalytic degradation of methylene blue. Bi 2 MoO 6 has been synthesized
via solid state and solvothermal or hydrothermal methods similar to Bi 2 WO 6 (Yin
et al. 2010a; Zhang et al. 2010). Comparison studies for synthesis method of
Bi 2 MoO 6 showed that smaller size, large surface area, and efficient photocatalytic
performance obtained from samples which fabricated via hydrothermal and
solvothermal methods not solid-state reaction. Furthermore, microwave method
was also applied to synthesize of Bi 2 MoO 6 in short time with good photocatalytic
performance (Xie et al. 2008). Different work, thin film of Bi 2 MoO 6 (200 nm
thickness) fabricated via thermal evaporation deposition process (see Fig. 10.6)
which showed high visible light-responsive photocatalyst property for rhodamine
B degradation (Cuéllar et al. 2011).
Bismuth titanate, also one important member of Aurivillius oxide family, introduced by a variety of compositions and showed high visible light-sensitive or
UV-sensitive photocatalytic for pollutants. Sillenite Bi 12 TiO 20 nanowires (Hou
et al. 2009) and perovskite Bi 4 Ti 3 O 12 (Li et al. 2016) demonstrated high
photocatalytic efficiency for methyl orange under light (<400 nm). Cubic phase À
Bismuth titanates (Bi 12 TiO 20 ) with a variety of morphological structures such as
flower-looking like, belt-looking like, and tetrahedral-looking-like shapes prepared
by easy approach showed in Fig. 10.7, which exhibited high photocatalytic degradation performance for methylene orange and p-nitrophenol (Guo et al. 2013).
BiVO 4
Bismuth vanadate (BiVO 4 ) is known as the most versatile member of
BiÀcompounds which has three crystallite phases: tetragonal zircon, monoclinic,
and tetragonal scheelite structures. BiVO 4 with monoclinic crystalline phase became
white light photoactivated because of low required energy band gap about 2.4 eV
compared to other phases. Hence, BiVO 4 with high adsorption in visible light region
and narrow band gap was considered as new materials for photocatalytic applications and other related researches. Due to special physicochemical features of BiVO 4
such as Ferro elasticity and theoretical band gap about 2.047 eV obtained from
density functional theory method, it has been considered as photocatalytic activity,
recently (Wang et al. 2019a). Multi shell hollow spheres of BiVO 4 synthesized via
carbonate template under thermal conditions are depicted in Fig. 10.8. Hollow
shapers bear great photo-induced performance within elimination of methylene
blue under solar light. Figure 10.9 also confirmed the claimed morphology for
BiVO 4 with scanning electron microscopy and transmittance electron microscopy
images (Zong et al. 2017).
Recently, variety ranges of BiVO 4 structures have been synthesized and applied
in photocatalytic performances such as elimination of polluters and H 2 or O 2
330
M. Zargazi and M. Chahkandi
layered structure Bi 2 MoO 6 . Zhang et al. (Huang et al. 2018) suggested that
nanosheets and microrods of Bi 2 MoO 6 were selectively synthesized via change of
pH of precursor solution in hydrothermal method and demonstrated efficient visible
light photocatalytic degradation of methylene blue. Bi 2 MoO 6 has been synthesized
via solid state and solvothermal or hydrothermal methods similar to Bi 2 WO 6 (Yin
et al. 2010a; Zhang et al. 2010). Comparison studies for synthesis method of
Bi 2 MoO 6 showed that smaller size, large surface area, and efficient photocatalytic
performance obtained from samples which fabricated via hydrothermal and
solvothermal methods not solid-state reaction. Furthermore, microwave method
was also applied to synthesize of Bi 2 MoO 6 in short time with good photocatalytic
performance (Xie et al. 2008). Different work, thin film of Bi 2 MoO 6 (200 nm
thickness) fabricated via thermal evaporation deposition process (see Fig. 10.6)
which showed high visible light-responsive photocatalyst property for rhodamine
B degradation (Cuéllar et al. 2011).
Bismuth titanate, also one important member of Aurivillius oxide family, introduced by a variety of compositions and showed high visible light-sensitive or
UV-sensitive photocatalytic for pollutants. Sillenite Bi 12 TiO 20 nanowires (Hou
et al. 2009) and perovskite Bi 4 Ti 3 O 12 (Li et al. 2016) demonstrated high
photocatalytic efficiency for methyl orange under light (<400 nm). Cubic phase À
Bismuth titanates (Bi 12 TiO 20 ) with a variety of morphological structures such as
flower-looking like, belt-looking like, and tetrahedral-looking-like shapes prepared
by easy approach showed in Fig. 10.7, which exhibited high photocatalytic degradation performance for methylene orange and p-nitrophenol (Guo et al. 2013).
BiVO 4
Bismuth vanadate (BiVO 4 ) is known as the most versatile member of
BiÀcompounds which has three crystallite phases: tetragonal zircon, monoclinic,
and tetragonal scheelite structures. BiVO 4 with monoclinic crystalline phase became
white light photoactivated because of low required energy band gap about 2.4 eV
compared to other phases. Hence, BiVO 4 with high adsorption in visible light region
and narrow band gap was considered as new materials for photocatalytic applications and other related researches. Due to special physicochemical features of BiVO 4
such as Ferro elasticity and theoretical band gap about 2.047 eV obtained from
density functional theory method, it has been considered as photocatalytic activity,
recently (Wang et al. 2019a). Multi shell hollow spheres of BiVO 4 synthesized via
carbonate template under thermal conditions are depicted in Fig. 10.8. Hollow
shapers bear great photo-induced performance within elimination of methylene
blue under solar light. Figure 10.9 also confirmed the claimed morphology for
BiVO 4 with scanning electron microscopy and transmittance electron microscopy
images (Zong et al. 2017).
Recently, variety ranges of BiVO 4 structures have been synthesized and applied
in photocatalytic performances such as elimination of polluters and H 2 or O 2
330
M. Zargazi and M. Chahkandi