A novel heterojunction photocatalyst, Bi2SiO5/g-C3N4: synthesis, characterization, photocatalytic activity, and mechanism

Yang, Chin-Tsung; Lee, Wenlian William; Lin, Ho-Pan; Dai, Yong‐Ming; Chi, Han-Ting; Chen, Chiing‐Chang

doi:10.1039/c6ra02299e

Cited by 91 publications

(14 citation statements)

References 97 publications

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“…H 2 O can ionize OH, as shown (19). The photogenerated electrons can react with dissolved oxygen molecules (O 2 ) to yield superoxide radical anions (·O 2 − ), as shown in (20), and ·O 2 − can react with H 2 O to produce ·OH (21) [55,56]. As previously mentioned, the VB of BiVO 4 can oxidize OH − to ·OH (22), and h + , ·O 2 − , and ·OH are strong oxidizing agents for the decomposition of organic dyes (23) [57].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Bi2S3/BiVO4 Heterojunction with a One-Step Hydrothermal Method Based on pH Control and the Evaluation of Visible-Light Photocatalytic Performance

Zhao

Wang²,

Zong

et al. 2017

Materials

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The band gaps of bismuth vanadate (BiVO4) and bismuth sulfide (Bi2S3) are about 2.40 eV and 1.30 eV, respectively. Although both BiVO4 and Bi2S3 are capable of strong visible light absorption, electron–hole recombination occurs easily. To solve this problem, we designed a one-step hydrothermal method for synthesizing a Bismuth sulfide (Bi2S3)/Bismuth vanadate (BiVO4) heterojunction using polyvinylpyrrolidone K-30 (PVP) as a structure-directing agent, and 2-Amino-3-mercaptopropanoic acid (l-cysteine) as a sulfur source. The pH of the reaction solution was regulated to yield different products: when the pH was 7.5, only monoclinic BiVO4 was produced (sample 7.5); when the pH was 8.0 or 8.5, both Bi2S3 and BiVO4 were produced (samples 8.0 and 8.5); and when the pH was 9.0, only Bi2S3 was produced (sample 9.0). In sample 8.0, Bi2S3 and BiVO4 were closely integrated with each other, with Bi2S3 particles formed on the surface of concentric BiVO4 layers, but the two compounds grew separately in a pH solution of 8.5. Visible-light photocatalytic degradation experiments demonstrated that the degradation efficiency of the Bi2S3/BiVO4 heterojunction was highest when prepared under a pH of 8.0. The initial rhodamine B in the solution (5 mg/L) was completely degraded within three hours. Recycling experiments verified the high stability of Bi2S3/BiVO4. The synthesis method proposed in this paper is expected to enable large-scale and practical use of Bi2S3/BiVO4.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Bi2S3/BiVO4 Heterojunction with a One-Step Hydrothermal Method Based on pH Control and the Evaluation of Visible-Light Photocatalytic Performance

Zhao

Wang²,

Zong

et al. 2017

Materials

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“…It has been applied to the field of photocatalysis and has lots of advantages, such as non-toxicity, chemical stability and excellent photocatalytic activity [21][22][23]. However, Bi2SiO5 can only be applied in the ultraviolet region because of its wide bandgap (~3.5 eV) [24,25]. Therefore, it is necessary to take effective methods to expand the photo-response range of Bi2SiO5.…”

Section: Introductionmentioning

confidence: 99%

A high-performance Bi2O3/Bi2SiO5 p-n heterojunction photocatalyst induced by phase transition of Bi2O3

Lü

Hao

Chen

et al. 2018

Applied Catalysis B: Environmental

284

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In this work, Bi2O3/Bi2SiO5 p-n heterojunction photocatalyst was successfully fabricated via a facile one-step synthesis using Bi(NO3)3 and nano-SiO2 as precursors.With the increasing amount of SiO2, α-Bi2O3 gradually transferred into β-Bi2O3, and Bi2O3/Bi2SiO5 p-n heterojunction was obtained at the same time. The as-prepared samples were systematically characterized by XRD, scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS). The Bi2O3/Bi2SiO5 heterojunction photocatalysts exhibited higher photocatalytic activity than α-Bi2O3 on the degradation of organic pollutants under simulated sunlight irradiation. The enhanced photocatalytic activity could be ascribed to the larger specific surface area, the larger contact angle, the formation of β-Bi2O3 and construction of p-n heterojunction. More importantly, the phase transition mechanism of Bi2O3 in Bi2O3/Bi2SiO5 heterojunction photocatalyst was proposed, which is significant for the theoretical study and application of photocatalytic materials.

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“…Therefore, it is difficult to effective utilize solar energy. Recently, two approaches have been used to develop highly efficient photocatalysts: modification of traditional photocatalysts (e.g., TiO 2 and ZnO) [4,5] and development of novel photocatalysts or photocatalytic systems [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Electronic Structure and Optical Properties of BiOI as a Photocatalyst Driven by Visible Light

Dai

Zhao

2016

Catalysts

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Bismuth oxyiodide (BiOI) is an important photoelectric functional material that has a wide range of applications. In particular, it can be used as a photocatalyst that shows photocatalytic activity under visible-light irradiation. The synthesis procedure and related photocatalytic performance of BiOI have been reported. However, some of its fundamental properties still need to be further investigated. In this article, density functional theory calculations were performed to investigate the crystal structure, electronic properties, and optical properties of BiOI. Furthermore, the relationship between the intrinsic properties and the photocatalytic performance of BiOI was investigated. Based on the calculated results of the band structure, density of states, and projected wave function, the molecular-orbital bonding structure of BiOI is proposed. As a semiconductor photocatalyst, BiOI shows slight optical anisotropy in the visible-light region, indicating that it can efficiently absorb visible light if the morphology of BiOI is controlled. After comparing several computational methods, it was found that the generalized-gradient approximation corrected for on-site Coulomb interactions (GGA + U) is a suitable computational method for large sized BiOI models (e.g., impurity doping, the surface, and the interface) because it can significantly reduce the computational time while maintaining calculation accuracy. Thus, this article not only provides an in-depth understanding of the fundamental properties of BiOI as a potential efficient photocatalyst driven by visible light, but it also suggests a suitable computational method to investigate these properties.

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A novel heterojunction photocatalyst, Bi₂SiO₅/g-C₃N₄: synthesis, characterization, photocatalytic activity, and mechanism

Abstract: A new type of heterojunction photocatalyst, Bi2SiO5/g-C3N4, was prepared using a controlled hydrothermal method.

Cited by 91 publications

References 97 publications

Synthesis of Bi2S3/BiVO4 Heterojunction with a One-Step Hydrothermal Method Based on pH Control and the Evaluation of Visible-Light Photocatalytic Performance

Synthesis of Bi2S3/BiVO4 Heterojunction with a One-Step Hydrothermal Method Based on pH Control and the Evaluation of Visible-Light Photocatalytic Performance

A high-performance Bi2O3/Bi2SiO5 p-n heterojunction photocatalyst induced by phase transition of Bi2O3

Electronic Structure and Optical Properties of BiOI as a Photocatalyst Driven by Visible Light

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