Facile Synthesis of BiOBr/Bi₂Sn₂O₇ Heterojunction Photocatalysts with Improved Photocatalytic Activities

Abstract

BiOBr/Bi2Sn2O7 heterojunction photocatalysts were successfully synthesized by treating hydrothermal as‐prepared Bi2Sn2O7 nanoparticles with hydrobromic acid (HBr). Partial Bi2Sn2O7 nanoparticles reacted with HBr to form the sheet‐like BiOBr, and Bi2Sn2O7 nanoparticles distributed evenly on BiOBr sheets. BiOBr/Bi2Sn2O7 photocatalysts treated with different concentrations of HBr solution were successfully obtained, and their structures, morphologies, optical, and visible light photocatalytic properties were characterized by XRD, DRS, PL, SEM, and TEM. The experimental results showed that the BiOBr/Bi2Sn2O7 photocatalysts showed improved photocatalytic activity under visible light irradiation than pure Bi2Sn2O7. The sample treated with 0.08 mol/L HBr solution shows the best visible light photodegradation performance of rhodamine B. In addition, the active species and photocatalytic mechanism were discussed in detail.

0D CoP cocatalyst/ 2D g‐C3N4 nanosheets: An efficient photocatalyst for promoting photocatalytic hydrogen evolution

“…Its effectivity promotes the separation and transmission of photogenerated charges, reduces the recombination rate of photogenerated carriers in semiconductors, and enhances photocatalytic efficiency. These heterogeneous such as precious metal precipitation (Au, Pt, Pd, Ag), nonmental deposition (S, Br, B), semiconductor heterojunction modification (such as: TiO 2 , WO 3 , BiOBr, CdS), which can greatly widen the application of the g‐C 3 N 4 ‐based nanomaterials. Although several cocatalysts have been introduced into the photocatalytic system, the efficiency of photocatalytic hydrogen production needs to be further improved.…”

Construction of Bi2Fe4O9/red phosphorus heterojunction for rapid and efficient photo‐reduction of Cr(VI)

“…[8][9][10][11] Numerous studies have found that the construction of heterojunctions can promote the rapid transfer and decrease the recombination probability of photogenerated electron-hole pairs in the photocatalytic process, and thus can improve the photocatalytic efficiency. [12][13][14] However, constructed heterojunctions do not always work properly due to the severe mismatch of interface structures among different components at the atomic level. If the constructed heterojunction structure can achieve efficient charge separation, then semiconductors should have not only a matching arrangement of energy bands but also key factors, such as a good contact interface.…”

“…Charge separation and transport in semiconductor photocatalysts are important factors in determining the solar energy conversion efficiency of photocatalysis and are even considered a bottleneck in the field of photocatalysis 8–11 . Numerous studies have found that the construction of heterojunctions can promote the rapid transfer and decrease the recombination probability of photogenerated electron–hole pairs in the photocatalytic process, and thus can improve the photocatalytic efficiency 12–14 . However, constructed heterojunctions do not always work properly due to the severe mismatch of interface structures among different components at the atomic level.…”

Controlled synthesis of Bi2O3/BiOBr/Zn2GeO4 heterojunction photocatalysts with enhanced photocatalytic activity

“…Interestingly, BiOBr, with unique layered structure and a band gap of approximately 2.9 eV, is an efficient visible‐light‐driven photocatalyst. Up to now, a variety of BiOBr based micro/nanostructures have been successfully synthesized and used for photodegradation of contaminations . Among them, the combination of p ‐type BiOBr semiconductor with n ‐type Zn 2 GeO 4 semiconductor to construct a heterojunction would supply a good platform to optimize the photocatalytic activity …”

“…Up to now, a variety of BiOBr based micro/nanostructures have been successfully synthesized and used for photodegradation of contaminations. [18][19][20][21][22][23][24][25][26] Among them, the combination of p-type BiOBr semiconductor with n-type Zn 2 GeO 4 semiconductor to construct a heterojunction would supply a good platform to optimize the photocatalytic activity. 27 Nevertheless, suitable surface modification via semiconductor quantum dots is an efficient strategy to facilitate the photocatalytic activity.…”