Enhancement of visible-light photocatalytic efficiency of BiOCl/Bi 2O3 by surface modification with WO3

Ashok Kumar Chakraborty; Sher Bahadur Rawal; Song Yi Han; Seung Yong Chai; Wan In Lee

doi:10.1016/j.apcata.2011.08.040

Enhancement of visible-light photocatalytic efficiency of BiOCl/Bi ₂O₃ by surface modification with WO₃

Ashok Kumar Chakraborty, Sher Bahadur Rawal, Song Yi Han, Seung Yong Chai, Wan In Lee

Inha University

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

Abstract

The visible-light photocatalytic efficiency of BiOCl/Bi₂O ₃ composites was notably enhanced by covering their surfaces with monolayer of WO₃. The photocatalytic activity of WO ₃/BiOCl/Bi₂O₃ in decomposing gaseous 2-propanol (IP) and aqueous 1,4-terephthalic acid (TPA) under visible-light irradiation (λ ≥ 420 nm) was maximized by introducing a 0.6 mol% of WO₃ to BiOCl/Bi₂O₃, whereas further increases of WO ₃ sharply decreased its activity. This suggests that monolayer coverage of BiOCl/Bi₂O₃ with molecular WO₃ optimizes photocatalytic activity, and therefore, that the role of WO ₃ is to improve the adsorption affinity of BiOCl/Bi₂O ₃ toward OH^-, H₂O, and organic species. In the evolution of CO₂ from IP, 0.6%WO₃/BiOCl/Bi ₂O₃ exhibited 2.7 times the photocatalytic efficiency of bare BiOCl/Bi₂O₃. Remarkably, its efficiency was estimated to be 1.7 times that of typical N-doped TiO₂. Moreover, it was found that the surface coverage of WO₃ greatly extended the chemical stability of BiOCl/Bi₂O₃ during photocatalytic reaction.

Original language	English
Pages (from-to)	217-223
Number of pages	7
Journal	Applied Catalysis A: General
Volume	407
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcata.2011.08.040
State	Published - 4 Nov 2011

Bibliographical note

Funding Information:
This work has been supported by the Korean Center for Artificial Photosynthesis (KCAP) funded by the Ministry of Education, Science, and Technology ( NRF-2009-C1AAA001-2009-0093879 ), the Ministry of Environment, Republic of Korea (project no. 022-061-026 ), and the National Research Foundation of Korea (project no. 2009-0076463 ).

Keywords

2-propanol
BiOCl/Bi O
CO evolution
Heterojunction
Photocatalyst
Terephthalic acid
Visible-light
WO

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10.1016/j.apcata.2011.08.040

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@article{c272eb21d294466eb4ebeaa50ad33b53,

title = "Enhancement of visible-light photocatalytic efficiency of BiOCl/Bi 2O3 by surface modification with WO3",

abstract = "The visible-light photocatalytic efficiency of BiOCl/Bi2O 3 composites was notably enhanced by covering their surfaces with monolayer of WO3. The photocatalytic activity of WO 3/BiOCl/Bi2O3 in decomposing gaseous 2-propanol (IP) and aqueous 1,4-terephthalic acid (TPA) under visible-light irradiation (λ ≥ 420 nm) was maximized by introducing a 0.6 mol% of WO3 to BiOCl/Bi2O3, whereas further increases of WO 3 sharply decreased its activity. This suggests that monolayer coverage of BiOCl/Bi2O3 with molecular WO3 optimizes photocatalytic activity, and therefore, that the role of WO 3 is to improve the adsorption affinity of BiOCl/Bi2O 3 toward OH-, H2O, and organic species. In the evolution of CO2 from IP, 0.6%WO3/BiOCl/Bi 2O3 exhibited 2.7 times the photocatalytic efficiency of bare BiOCl/Bi2O3. Remarkably, its efficiency was estimated to be 1.7 times that of typical N-doped TiO2. Moreover, it was found that the surface coverage of WO3 greatly extended the chemical stability of BiOCl/Bi2O3 during photocatalytic reaction.",

keywords = "2-propanol, BiOCl/Bi O, CO evolution, Heterojunction, Photocatalyst, Terephthalic acid, Visible-light, WO",

author = "Chakraborty, {Ashok Kumar} and Rawal, {Sher Bahadur} and Han, {Song Yi} and Chai, {Seung Yong} and Lee, {Wan In}",

note = "Funding Information: This work has been supported by the Korean Center for Artificial Photosynthesis (KCAP) funded by the Ministry of Education, Science, and Technology ( NRF-2009-C1AAA001-2009-0093879 ), the Ministry of Environment, Republic of Korea (project no. 022-061-026 ), and the National Research Foundation of Korea (project no. 2009-0076463 ).",

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doi = "10.1016/j.apcata.2011.08.040",

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AU - Chakraborty, Ashok Kumar

AU - Rawal, Sher Bahadur

AU - Han, Song Yi

AU - Chai, Seung Yong

AU - Lee, Wan In

N1 - Funding Information: This work has been supported by the Korean Center for Artificial Photosynthesis (KCAP) funded by the Ministry of Education, Science, and Technology ( NRF-2009-C1AAA001-2009-0093879 ), the Ministry of Environment, Republic of Korea (project no. 022-061-026 ), and the National Research Foundation of Korea (project no. 2009-0076463 ).

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N2 - The visible-light photocatalytic efficiency of BiOCl/Bi2O 3 composites was notably enhanced by covering their surfaces with monolayer of WO3. The photocatalytic activity of WO 3/BiOCl/Bi2O3 in decomposing gaseous 2-propanol (IP) and aqueous 1,4-terephthalic acid (TPA) under visible-light irradiation (λ ≥ 420 nm) was maximized by introducing a 0.6 mol% of WO3 to BiOCl/Bi2O3, whereas further increases of WO 3 sharply decreased its activity. This suggests that monolayer coverage of BiOCl/Bi2O3 with molecular WO3 optimizes photocatalytic activity, and therefore, that the role of WO 3 is to improve the adsorption affinity of BiOCl/Bi2O 3 toward OH-, H2O, and organic species. In the evolution of CO2 from IP, 0.6%WO3/BiOCl/Bi 2O3 exhibited 2.7 times the photocatalytic efficiency of bare BiOCl/Bi2O3. Remarkably, its efficiency was estimated to be 1.7 times that of typical N-doped TiO2. Moreover, it was found that the surface coverage of WO3 greatly extended the chemical stability of BiOCl/Bi2O3 during photocatalytic reaction.

AB - The visible-light photocatalytic efficiency of BiOCl/Bi2O 3 composites was notably enhanced by covering their surfaces with monolayer of WO3. The photocatalytic activity of WO 3/BiOCl/Bi2O3 in decomposing gaseous 2-propanol (IP) and aqueous 1,4-terephthalic acid (TPA) under visible-light irradiation (λ ≥ 420 nm) was maximized by introducing a 0.6 mol% of WO3 to BiOCl/Bi2O3, whereas further increases of WO 3 sharply decreased its activity. This suggests that monolayer coverage of BiOCl/Bi2O3 with molecular WO3 optimizes photocatalytic activity, and therefore, that the role of WO 3 is to improve the adsorption affinity of BiOCl/Bi2O 3 toward OH-, H2O, and organic species. In the evolution of CO2 from IP, 0.6%WO3/BiOCl/Bi 2O3 exhibited 2.7 times the photocatalytic efficiency of bare BiOCl/Bi2O3. Remarkably, its efficiency was estimated to be 1.7 times that of typical N-doped TiO2. Moreover, it was found that the surface coverage of WO3 greatly extended the chemical stability of BiOCl/Bi2O3 during photocatalytic reaction.

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KW - Photocatalyst

KW - Terephthalic acid

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