One-pot synthesis of Bi₂₄O₃₁Br₁₀/Bi₄V₂O₁₁heterostructures and their photocatalytic properties

Abstract

heterojunction photocatalysts were successfully prepared by a facile, one-pot solvothermal method. In the obtained heterojunctions, Bi 4 V 2 O 11 nanoparticles were uniformly immobilized on or inlaid onto the surfaces of the Bi 24 O 31 Br 10 nanosheets. They exhibited superior visible light photocatalytic activity towards the degradation of rhodamine B (RhB). Among them, the 25% Bi 4 V 2 O 11 sample possessed the highest photocatalytic activity, the degradation rate of which was 4 and 6 times as fast as that of bare Bi 24 O 31 Br 10 and Bi 4 V 2 O 11 , respectively. The enhanced photocatalytic activity could be attributed to the effective separation and transfer of photogenerated carriers. The trapping experiments confirmed that the photogenerated holes and cO 2 À radicals were the main active species responsible for the photodegradation of RhB.

Photoelectrochemical water oxidation over fibrous and sponge-like BiVO4/β-Bi4V2O11 photoanodes fabricated by spray pyrolysis

“…9b) for BiVO 4 and Bi 4 V 2 O 11 were 0.21 ± 0.01 and 0.41 ± 0.01 V vs. RHE. These calculated values are in agreement with those reported in the literature [16,17]. Assuming the gap between flat band potential and bottom edge of the conduction band is negligible for n-type semiconductors [24], these values reflect the conduction band level of BiVO 4 and Bi 4 V 2 O 11 at pH 6.6.…”

“…Bi 4 V 2 O 11 is an n-type semiconductor with a bandgap energy of 2.25 eV, and the energy level of the valence (E VB ) and conduction (E CB ) bands of 2.78 and 0.53 eV vs. RHE, respectively [16]. It makes this perovskite suitable to be coupled with BiVO 4 , as its conduction band level (0.02 − 0.2 V vs. RHE) [17] is more negative than the E CB of Bi 4 V 2 O 11 .…”

Realizing nanosized interfacial contact via constructing BiVO4/Bi4V2O11 element-copied heterojunction nanofibres for superior photocatalytic properties

“…6a. Obviously, two symmetric peaks are displayed in the spectra, indicating the Bi ions are Bi 3+ [28,29]. The Bi4f peaks in BVO-1 shift about 0.1 eV towards lower binding energies relative to BVO-0.…”

Reading at exposed surfaces: theoretical insights into photocatalytic activity of ZnWO4

“…•radicals and singlet oxygen 1 O 2 ) to improve the photocatalytic activity of semiconductor-based photocatalysts [91][92][93][94][95][96][97][98][99][100][101] , but also a rational procedure for investigating the relationships between the surface structures and the photocatalytic properties to develop highly active photocatalysts. Then, crystal-facet engineering plays a central role in the kinetic and thermodynamic modulation of redox reactions at the catalyst's surface [102][103][104][105][106] .…”