Heterojunctioned BiOCl/Bi2O3, a new visible light photocatalyst

Chai, Seung Yong; Kim, Yong Joo; Jung, Myong Hak; Chakraborty, Ashok Kumar; Jung, D.; Lee, Wan In

doi:10.1016/j.jcat.2008.12.020

Cited by 471 publications

(224 citation statements)

References 33 publications

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“…As a photocatalyst, Bi 2 O 3 is a p-type semiconductor with conduction and valence band edges of +0.33 and +3.13 V (vs. NHE), respectively [8]. Under visible light irradiation, the photogenered electron and hole is able to oxidize water.…”

Section: Introductionmentioning

confidence: 99%

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Photoelectrocatalytic degradation of organic contaminants at Bi2O3/TiO2 nanotube array electrode

Zhao

Liu

2011

Applied Surface Science

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a b s t r a c tIn the current work, TiO 2 nanotube array was prepared via electrochemical anode method. Then the Bi 2 O 3 nanoparticles were deposited onto the TiO 2 nanotube array via dip-coating method from an amorphous complex precursor. The crystal structures were characterized via X-ray diffraction analysis. Their surface textures were observed via electron-scanning microscope. The prepared composite array electrode exhibited high photoelectrocatalytic activities towards degrading organic contaminants under visible light irradiation. High photoelectrocatalytic activities were also exhibited under UV light irradiation. The catalytic mechanism was discussed based on the analysis of electrochemical and degradation kinetics results. It is suggested a P (Bi 2 O 3 )-N (TiO 2 ) junction was formed to increase the catalytic activates. The stability of the electrode materials was confirmed finally.

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Section: Introductionmentioning

confidence: 99%

“…Under visible light irradiation, the photogenered electron and hole is able to oxidize water. And, highly reactive species, such as O 2 •− and • OH radicals may be generated, which may act as initiators of oxidation reactions [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Photoelectrocatalytic degradation of organic contaminants at Bi2O3/TiO2 nanotube array electrode

Zhao

Liu

2011

Applied Surface Science

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“…The photo-generated electrons will be transferred to semiconductor with more positive conduction band for photocatalysis (11). During this process, the recombination of the photo-generated electrons and holes is also reduced (12). Different BiOCl hybrid semiconductor heterostructures have been explored, such as BiOCl-g-C 3 N 4 (13), BiOCl/Ag 3 PO 4 (14), BiOI/BiOCl (15), graphene/BiOCl (16) and Ag/AgX/ BiOX (X = Cl, Br) (17).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photo-induced Charge Separation and Simulated Solar Photocatalytic Activity of α-Fe2O3/BiOCl Prepared In-situ

Liu

Zhong

et al. 2015

Journal of Advanced Oxidation Technologies

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Abstract:In this paper, α-Fe 2 O 3 /BiOCl composites were in-situ prepared by a hydrothermal routine and characterized by BET surface area, X-ray diffraction (XRD), UV/Vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM) and surface photovoltage spectroscopy (SPS), respectively. The separation efficiency of photo-induced charges was investigated using benzoquinone (BQ) as scavenger. The relationship between α-Fe 2 O 3 loading and the photocatalytic performance was investigated. When the molar ratio of Fe/Bi is 1/3, the composite material exhibits higher photocatalytic performance than the pure α-Fe 2 O 3 and BiOCl towards decolorization of Methyl Orange (MO) aqueous solution under the simulated sun light irradiation. The enhanced mechanism was also discussed.

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“…The enhancement of photocatalytic activity of AgBr/BiOBr is mainly ascribed to the heterojunction effect between AgBr and BiOBr. [28] and WO 3 /BiOCl [29]. The synthesis of BiOX-based composites is very important for the development of highly efficient visible light photocatalysts.…”

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confidence: 99%

“…Homogenous deposition is a simple way for the preparation of BiOX that has a plate structure, with high surface area, which facilities the adsorption of dyes and photocatalytic processes. Nowadays, in order to further improve the photoactivity of BiOX, BiOXbased composites have been constructed and adopted, such as BiOI/TiO 2 [23], AgI/BiOI [24], BiOI/Bi 2 O 3 [25], NaBiO 3 /BiOCl [26], Fe 3 O 4 /BiOCl [27], BiOCl/Bi 2 O 3 [28] and WO 3 /BiOCl [29]. The synthesis of BiOX-based composites is very important for the development of highly efficient visible light photocatalysts.…”

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confidence: 99%

Visible-light photocatalytic activity and mechanism of novel AgBr/BiOBr prepared by deposition-precipitation

et al. 2012

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A new composite photocatalyst AgBr/BiOBr was prepared by loading AgBr on a BiOBr substrate via deposition-precipitation and characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy and UV-vis diffuse reflectance spectroscopy. The as-prepared AgBr/BiOBr comprised face-centered cubic AgBr and tetragonal BiOBr particles. The average crystalline sizes of AgBr in the AgBr/BiOBr composites were less than 28.5 nm. The absorption edges of AgBr/ BiOBr in visible-light region had a red shift with increasing AgBr content. Photocatalytic degradation of methyl orange results show that the AgBr/BiOBr composites could degrade methyl orange efficiently under visible-light irradiation (>420 nm). The optimal molar percentage of AgBr was 50 mol% with corresponding maximum k app of 0.00619 min 1 . Active ·O 2  played a major role for methyl orange degradation while h + and ·OH had little effect on the photocatalytic process. The enhancement of photocatalytic activity of AgBr/BiOBr is mainly ascribed to the heterojunction effect between AgBr and BiOBr. [28] and WO 3 /BiOCl [29]. The synthesis of BiOX-based composites is very important for the development of highly efficient visible light photocatalysts.AgBr is an important semiconductor widely used as a photosensitive material in photography and as a photocatalyst for the degradation of pollutants or destruction of bacteria [24,[30][31][32][33][34][35][36][37][38][39][40][41][42][43][44]. Compared with BiOBr [18], AgBr [45] has a narrower band gap and higher visible-light absorption. Moreover, the two materials have matching energy band structures, according to the data reported in the literature [18,44], and which can effectively separate photogenerated electrons and holes to achieve enhanced photoactivity

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Heterojunctioned BiOCl/Bi2O3, a new visible light photocatalyst

Cited by 471 publications

References 33 publications

Photoelectrocatalytic degradation of organic contaminants at Bi2O3/TiO2 nanotube array electrode

Photoelectrocatalytic degradation of organic contaminants at Bi2O3/TiO2 nanotube array electrode

Enhanced Photo-induced Charge Separation and Simulated Solar Photocatalytic Activity of α-Fe2O3/BiOCl Prepared In-situ

Visible-light photocatalytic activity and mechanism of novel AgBr/BiOBr prepared by deposition-precipitation

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