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Bi(1-x)La(x)CuSeO as New Tunable Full Solar Light Active Photocatalysts.

Wang H, Li S, Liu Y, Ding J, Lin YH, Xu H, Xu B, Nan CW - Sci Rep (2016)

Bottom Line: However, efficiently harvesting solar energy for photocatalysis remains a pressing challenge, and the charge kinetics and mechanism of the photocatalytic process is far from being well understood.Our measurements and density-functional-theory calculations reveal that the effective mass and mobility of the carriers in BiCuSeO can be tuned by the La-doping, which are responsible for the tunable photocatalytic activity.Our findings may offer new perspectives for understanding the mechanism of photocatalysis through modulating the charge mobility and the effective mass of carriers and provide a guidance for designing efficient photocatalyts.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China.

ABSTRACT
Photocatalysis is attracting enormous interest driven by the great promise of addressing current energy and environmental crises by converting solar light directly into chemical energy. However, efficiently harvesting solar energy for photocatalysis remains a pressing challenge, and the charge kinetics and mechanism of the photocatalytic process is far from being well understood. Here we report a new full solar spectrum driven photocatalyst in the system of a layered oxyselenide BiCuSeO with good photocatalytic activity for degradation of organic pollutants and chemical stability under light irradiation, and the photocatalytic performance of BiCuSeO can be further improved by band gap engineering with introduction of La. Our measurements and density-functional-theory calculations reveal that the effective mass and mobility of the carriers in BiCuSeO can be tuned by the La-doping, which are responsible for the tunable photocatalytic activity. Our findings may offer new perspectives for understanding the mechanism of photocatalysis through modulating the charge mobility and the effective mass of carriers and provide a guidance for designing efficient photocatalyts.

No MeSH data available.


Photocatalytic degradation of Congo Red solution in the presence of Bi1−xLaxCuSeO (x = 0, 0.04, 0.08) powders under irradiation of (a) UV (λ = 365 ± 5 nm), (b) visible (420 nm < λ < 780 nm) and (c) near-infrared light (800 nm < λ < 1100 nm). Cycling runs using Bi0.92La0.08CuSeO powders under (d) visible and (e) near-infrared light irradiation.
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f2: Photocatalytic degradation of Congo Red solution in the presence of Bi1−xLaxCuSeO (x = 0, 0.04, 0.08) powders under irradiation of (a) UV (λ = 365 ± 5 nm), (b) visible (420 nm < λ < 780 nm) and (c) near-infrared light (800 nm < λ < 1100 nm). Cycling runs using Bi0.92La0.08CuSeO powders under (d) visible and (e) near-infrared light irradiation.

Mentions: The photocatalytic activity of a series of Bi1−xLaxCuSeO powders was evaluated by monitoring the decomposition of the model pollutants Congo Red (CR) aqueous solution under UV, visible and NIR light, respectively. A 5W LED with emission wavelength of 365 ± 5 nm was used as the UV light source, and a 300 W xenon lamp with 420 nm and 800 nm filters was used as visible and NIR light source, respectively. As shown in Fig. 2a–c, all the samples exhibit good broad-spectrum responsive photocatalytic activity. Pristine BiCuSeO displays inherent photocatalytic activity in UV, visible and NIR light region, and about 45%, 49% and 44% of CR solution was photodegraded in 180 min, respectively. The photocatalytic activity is comparable with the previous works in Cu2(OH)PO414 and Bi2WO615. Fascinatingly, although the band gap of BiCuSeO broaden slightly after doping with La, Bi1−xLaxCuSeO (x = 0.04 and 0.08) powders show more preferable photocatalytic activity in the whole solar light region, and the degradation rate enhances with increasing La content. With the assistant of Bi0.92La0.08CuSeO, nearly 70%, 75% and 90% of CR solution was degraded under UV, visible and NIR light, respectively, within the same reaction time.


Bi(1-x)La(x)CuSeO as New Tunable Full Solar Light Active Photocatalysts.

Wang H, Li S, Liu Y, Ding J, Lin YH, Xu H, Xu B, Nan CW - Sci Rep (2016)

Photocatalytic degradation of Congo Red solution in the presence of Bi1−xLaxCuSeO (x = 0, 0.04, 0.08) powders under irradiation of (a) UV (λ = 365 ± 5 nm), (b) visible (420 nm < λ < 780 nm) and (c) near-infrared light (800 nm < λ < 1100 nm). Cycling runs using Bi0.92La0.08CuSeO powders under (d) visible and (e) near-infrared light irradiation.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4837348&req=5

f2: Photocatalytic degradation of Congo Red solution in the presence of Bi1−xLaxCuSeO (x = 0, 0.04, 0.08) powders under irradiation of (a) UV (λ = 365 ± 5 nm), (b) visible (420 nm < λ < 780 nm) and (c) near-infrared light (800 nm < λ < 1100 nm). Cycling runs using Bi0.92La0.08CuSeO powders under (d) visible and (e) near-infrared light irradiation.
Mentions: The photocatalytic activity of a series of Bi1−xLaxCuSeO powders was evaluated by monitoring the decomposition of the model pollutants Congo Red (CR) aqueous solution under UV, visible and NIR light, respectively. A 5W LED with emission wavelength of 365 ± 5 nm was used as the UV light source, and a 300 W xenon lamp with 420 nm and 800 nm filters was used as visible and NIR light source, respectively. As shown in Fig. 2a–c, all the samples exhibit good broad-spectrum responsive photocatalytic activity. Pristine BiCuSeO displays inherent photocatalytic activity in UV, visible and NIR light region, and about 45%, 49% and 44% of CR solution was photodegraded in 180 min, respectively. The photocatalytic activity is comparable with the previous works in Cu2(OH)PO414 and Bi2WO615. Fascinatingly, although the band gap of BiCuSeO broaden slightly after doping with La, Bi1−xLaxCuSeO (x = 0.04 and 0.08) powders show more preferable photocatalytic activity in the whole solar light region, and the degradation rate enhances with increasing La content. With the assistant of Bi0.92La0.08CuSeO, nearly 70%, 75% and 90% of CR solution was degraded under UV, visible and NIR light, respectively, within the same reaction time.

Bottom Line: However, efficiently harvesting solar energy for photocatalysis remains a pressing challenge, and the charge kinetics and mechanism of the photocatalytic process is far from being well understood.Our measurements and density-functional-theory calculations reveal that the effective mass and mobility of the carriers in BiCuSeO can be tuned by the La-doping, which are responsible for the tunable photocatalytic activity.Our findings may offer new perspectives for understanding the mechanism of photocatalysis through modulating the charge mobility and the effective mass of carriers and provide a guidance for designing efficient photocatalyts.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China.

ABSTRACT
Photocatalysis is attracting enormous interest driven by the great promise of addressing current energy and environmental crises by converting solar light directly into chemical energy. However, efficiently harvesting solar energy for photocatalysis remains a pressing challenge, and the charge kinetics and mechanism of the photocatalytic process is far from being well understood. Here we report a new full solar spectrum driven photocatalyst in the system of a layered oxyselenide BiCuSeO with good photocatalytic activity for degradation of organic pollutants and chemical stability under light irradiation, and the photocatalytic performance of BiCuSeO can be further improved by band gap engineering with introduction of La. Our measurements and density-functional-theory calculations reveal that the effective mass and mobility of the carriers in BiCuSeO can be tuned by the La-doping, which are responsible for the tunable photocatalytic activity. Our findings may offer new perspectives for understanding the mechanism of photocatalysis through modulating the charge mobility and the effective mass of carriers and provide a guidance for designing efficient photocatalyts.

No MeSH data available.