A controlled anion exchange strategy to synthesize core-shell β-bismuth oxide/bismuth sulfide hollow heterostructures with enhanced visible-light photocatalytic activity

Yan, Yunhui; Zhou, Zhaoxian; Zhao, Xiaohua; Zhou, Junhu

doi:10.1016/j.jcis.2014.08.027

Cited by 44 publications

(8 citation statements)

References 42 publications

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“…To further understand the effect of the h/m-WO 3 phase junction photocatalyst on photocatalytic activity, the optical properties, energy gap, and the band structure of WO 3 samples were studied, respectively. Optical absorption properties of a semiconductor are often closely associated with its energy level and band gap and are recognized as a key factor in determining photocatalytic activity. − …”

Section: Results and Discussionmentioning

confidence: 99%

K₂SO₄-Assisted Hexagonal/Monoclinic WO₃ Phase Junction for Efficient Photocatalytic Degradation of RhB

Zhang

Wang

et al. 2018

ACS Appl. Energy Mater.

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Fabrication of a phase junction in the photocatalyst is one of the efficient strategies for enhancement of the photocatalytic activity. However, research on the relation between phase composition and photocatalytic property of WO3 is limited because of the barely controllable phase transition process from monoclinic to hexagonal phase. A facile sol–gel synthesis of a composition tunable hexagonal/monoclinic-WO3 (h/m-WO3) phase junction with K2SO4 as stabilizing agent is developed. X-ray powder diffraction, scanning electron microscopy, UV–Raman, high-resolution transmission electron microscopy, and UV–vis diffusion reflectance spectroscopy are employed to investigate the structures, morphologies, crystalline phases, phase composition, and optical properties of the as-prepared samples. Contents of the hexagonal phase in the WO3 samples can be precisely adjusted in a wide range from 0 to 71.1 wt % by regulating the K2SO4 amount, the calcination temperature, and the calcination time. Degradation of rhodamine B of samples indicates that the reaction rate depends significantly on the contents of the hexagonal/monoclinic phase in the WO3 samples. A 7.4 times enhancement in the reaction rate is observed for the h/m-WO3 sample with 71.1 wt % h-WO3 than the pure m-WO3. The increased photocatalytic activity is attributed to the formation of a phase junction between h-WO3 and m-WO3, which exhibits high efficiency of the separation and transfer of photoexcited electron–hole, as evident from electrochemical impedance spectra results. This work provides a new insight into the fabrication of a phase composition designable h/m-WO3 phase junction with high photocatalytic performance, which benefits the application of WO3 in environmental protection issues.

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Section: Results and Discussionmentioning

confidence: 99%

K₂SO₄-Assisted Hexagonal/Monoclinic WO₃ Phase Junction for Efficient Photocatalytic Degradation of RhB

Zhang

Wang

et al. 2018

ACS Appl. Energy Mater.

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“…The entire ZnO shows a type IV isotherm with a type H3 hysteresis loop that is found in the mesoporous materials with slit holes produced by aggregation of layered structure, which proves the co‐existence of itself holes and accumulation holes in ZnO particles. this kind of mesoporous materials is very useful in photocatalysis as it can promote the transportation of reactant molecules and products . Each inset distinctly exhibits that mesoprous and macropores co‐exist in the each kind of ZnO and the pore size distribution of S2 and S3 is more concentrated than that of S1 and S4.…”

Section: Resultsmentioning

confidence: 99%

Template‐free synthesis of hierarchical zinc oxide with improved photocatalytic properties

Wang

Han

Song

et al. 2016

Crystal Research and Technology

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Novel hierarchical nano materials possess tremendous latent force in many applications. In this paper, hierarchical flower-like, spherical and bowl-like zinc oxide was successfully synthesized by altering solvent ratio (absolute ethanol and diethylene glycol) via a simple and templatefree solvothermal synthetic route. The solvent ratio also plays a vital role in deciding the structure, crystalline, band gap energy and specific surface area of the as-synthesized samples. The preparation mechanism of ZnO in mixed alcohols was discussed. The obtained samples were characterized by energy dispersive spectroscopy(EDS), X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), N2 adsorption-desorption, UV-vis diffuse reflectance spectroscopy (DRS). Photocatalytic activity of the as-prepared ZnO nanocrystals was evaluated by the degradation of MB under UV irradiation. Among, the most effective photocatalyst was synthesized when the diethylene glycol was 10 ml.

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“…Different bismuth-containing semiconductors have similar layered structures, which makes the preparation of heterojunctions between two bismuth-containing photocatalysts easy. Many composite photocatalysts of this kind have been reported in recent years; e.g., Bi2O3-BiVO4 [50][51][52], Bi2O3-Bi2WO6 [53], Bi2O3/Bi2SiO5 [54], BiOBr/Bi24O31Br10 [55], BiOI/BiOBr and BiOCl/BiOI [56,57], BiOCl/BiVO4 [58], BiOI/Bi2O2CO3 [59,60], Bi2O3-Bi2S3 [61,62], BiVO4/Bi2O2CO3 [63], and Bi2O2CO3/ Bi2MoO6 [64], BiOI/Bi2WO6 [65], β-Bi2O3-BiOI [66], Bi-OI/Bi2MoO6 [67] and BiVO4/Bi2WO6 [68].…”

Section: Heterojunctions Between Two Bismuth-containing Semiconductorsmentioning

confidence: 99%

Recent advances in bismuth-containing photocatalysts with heterojunctions

Chen

Liu

et al. 2016

Chinese Journal of Catalysis

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A controlled anion exchange strategy to synthesize core-shell β-bismuth oxide/bismuth sulfide hollow heterostructures with enhanced visible-light photocatalytic activity

Cited by 44 publications

References 42 publications

K₂SO₄-Assisted Hexagonal/Monoclinic WO₃ Phase Junction for Efficient Photocatalytic Degradation of RhB

K₂SO₄-Assisted Hexagonal/Monoclinic WO₃ Phase Junction for Efficient Photocatalytic Degradation of RhB

Template‐free synthesis of hierarchical zinc oxide with improved photocatalytic properties

Recent advances in bismuth-containing photocatalysts with heterojunctions

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A controlled anion exchange strategy to synthesize core-shell β-bismuth oxide/bismuth sulfide hollow heterostructures with enhanced visible-light photocatalytic activity

Cited by 44 publications

References 42 publications

K2SO4-Assisted Hexagonal/Monoclinic WO3 Phase Junction for Efficient Photocatalytic Degradation of RhB

K2SO4-Assisted Hexagonal/Monoclinic WO3 Phase Junction for Efficient Photocatalytic Degradation of RhB

Template‐free synthesis of hierarchical zinc oxide with improved photocatalytic properties

Recent advances in bismuth-containing photocatalysts with heterojunctions

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K₂SO₄-Assisted Hexagonal/Monoclinic WO₃ Phase Junction for Efficient Photocatalytic Degradation of RhB

K₂SO₄-Assisted Hexagonal/Monoclinic WO₃ Phase Junction for Efficient Photocatalytic Degradation of RhB