(Zhao et al. 2014). Among BiOX compounds, BiOI has narrowest band gap besides
highest utilization of solar source. BiOI is a semiconductor with intrinsic rapid
recombination of charge carriers singly, so BiOI cannot show acceptable
photocatalytic performance. Therefore, a lot of strategies were proposed for combination/synthetization of BiOI with other semiconductors to improve the related
photocatalytic activity.
Bi 2 MO 6
Bi 2 MO 6 are known as the famous triplet oxygen À bismuth compounds with
Aurivillius
1 structure depicted by (Bi 2 O 2 )
2+ (A n À 1 B n O 3n + 1 )
2À (A ¼ Ba, Bi, Pb,
so on., B ¼ Ti, Nb, W, Mo, so on.) which has intercalated structures with sheets of
perovskite-bearing octahedral (A nÀ1 B n O 3n + 1 )
2À sandwiched array between
(Bi 2 O 2 )
2+ layers. Until now, a variety of bismuth Aurivillius oxides containing
bismuth tungstate, bismuth molybdate, and bismuth subcarbonate have been fabricated, which has excellent potential for photocatalysis usages such as water treatment and photocatalytic water splitting (Zhao et al. 2014; Meng and Zhang 2016).
Bismuth tungstate (Bi 2 WO 6 ) is known as one of the easiest structures of the
Aurivillius group (n ¼ 1) having a layered standing with WO 6 sheets. The perovskite
block in Bi 2 WO 6 composited of 2D array of WO 6 octahedral linked corner, with
thick octahedral layer. Bi 2 WO 6 has great potential for oxygen evolution reaction
within hydrolysis and oxidation of toxic polluters under white light. Zhang et al.
(2007) reported that various morphologies of Bi 2 WO 6 nano and microstructures,
including flower-, tire-, and spiral-like shapes, showed excellent solar light photoactivated catalytic efficiency for remediation of rhodamine B that could be related to
the presented morphology, size, and structure. Furthermore, the pH value of the
solution contained of pollutant also defines the photocatalytic performance of
photocatalyst. Zhu et al. (2016) proved the pH effect of initial solution on the
photocatalysis performance of nanosheets Bi 2 WO 6 for degradation of rhodamine
B which could be related to mode and adsorptionÀdesorption of rhodamine B on the
semiconductor surface. Bi 2 WO 6 also exhibited high performance for air treatment
and water splitting applications (Larson and Zhao 2016). Yu et al. suggested that
well-crystalized bismuth tungstate with high surface area which could perform
photocatalytic degradation of formaldehyde gas in air (Yu et al. 2005).
Bi 2 MoO 6 is also another layered member of Aurivillius compounds which has
recently drawn enormous scientific attentions due to the photocatalytic properties
within hydrolysis and photooxidation of contaminants. The layered structure
Bi 2 MoO 6 is synthesized via refluxing method which exhibited high photocatalytic
efficiency for oxygen liberation from an aqueous solution of AgNO 3 induced by
solar light (Shimodaira et al. 2006). The obtained results suggested that
1 Aurivillius phases are a form of perovskite built by alternating layers of [Bi 2 O 2 ]
2+ and pseudoperovskite blocks.
10 Bismuth-Based Compounds as Visible Light Photocatalyst for Remediation and. . .
329
highest utilization of solar source. BiOI is a semiconductor with intrinsic rapid
recombination of charge carriers singly, so BiOI cannot show acceptable
photocatalytic performance. Therefore, a lot of strategies were proposed for combination/synthetization of BiOI with other semiconductors to improve the related
photocatalytic activity.
Bi 2 MO 6
Bi 2 MO 6 are known as the famous triplet oxygen À bismuth compounds with
Aurivillius
1 structure depicted by (Bi 2 O 2 )
2+ (A n À 1 B n O 3n + 1 )
2À (A ¼ Ba, Bi, Pb,
so on., B ¼ Ti, Nb, W, Mo, so on.) which has intercalated structures with sheets of
perovskite-bearing octahedral (A nÀ1 B n O 3n + 1 )
2À sandwiched array between
(Bi 2 O 2 )
2+ layers. Until now, a variety of bismuth Aurivillius oxides containing
bismuth tungstate, bismuth molybdate, and bismuth subcarbonate have been fabricated, which has excellent potential for photocatalysis usages such as water treatment and photocatalytic water splitting (Zhao et al. 2014; Meng and Zhang 2016).
Bismuth tungstate (Bi 2 WO 6 ) is known as one of the easiest structures of the
Aurivillius group (n ¼ 1) having a layered standing with WO 6 sheets. The perovskite
block in Bi 2 WO 6 composited of 2D array of WO 6 octahedral linked corner, with
thick octahedral layer. Bi 2 WO 6 has great potential for oxygen evolution reaction
within hydrolysis and oxidation of toxic polluters under white light. Zhang et al.
(2007) reported that various morphologies of Bi 2 WO 6 nano and microstructures,
including flower-, tire-, and spiral-like shapes, showed excellent solar light photoactivated catalytic efficiency for remediation of rhodamine B that could be related to
the presented morphology, size, and structure. Furthermore, the pH value of the
solution contained of pollutant also defines the photocatalytic performance of
photocatalyst. Zhu et al. (2016) proved the pH effect of initial solution on the
photocatalysis performance of nanosheets Bi 2 WO 6 for degradation of rhodamine
B which could be related to mode and adsorptionÀdesorption of rhodamine B on the
semiconductor surface. Bi 2 WO 6 also exhibited high performance for air treatment
and water splitting applications (Larson and Zhao 2016). Yu et al. suggested that
well-crystalized bismuth tungstate with high surface area which could perform
photocatalytic degradation of formaldehyde gas in air (Yu et al. 2005).
Bi 2 MoO 6 is also another layered member of Aurivillius compounds which has
recently drawn enormous scientific attentions due to the photocatalytic properties
within hydrolysis and photooxidation of contaminants. The layered structure
Bi 2 MoO 6 is synthesized via refluxing method which exhibited high photocatalytic
efficiency for oxygen liberation from an aqueous solution of AgNO 3 induced by
solar light (Shimodaira et al. 2006). The obtained results suggested that
1 Aurivillius phases are a form of perovskite built by alternating layers of [Bi 2 O 2 ]
2+ and pseudoperovskite blocks.
10 Bismuth-Based Compounds as Visible Light Photocatalyst for Remediation and. . .
329