C-scheme electron transfer mechanism: An efficient ternary heterojunction photocatalyst carbon quantum dots/Bi/BiOBr with full ohmic contact

Modified UiO-66-Br Microphotocatalyst with High Electron Mobility Enhances Tetracycline Degradation

“…31,32 In Figure 2e, a new diffraction peak appeared at 69.4 eV 33 for the UB material, which was due to the formation of Br−Bi, and it was consistent with the diffraction peak position of conventional BiOBr. 34,35 In Figure 2f, the 159.3 and 164.6 eV diffraction peaks of the UB material in the Bi 4f spectrum corresponded to the characteristic peaks of bismuth oxide, 36,37 which corresponded well with the FTIR results above. It also illustrated that Bi was not supported on the UiO-66-Br surface in the form of atoms, but the synthesis reaction occurred and was generated in the form of BiOBr at the position of U ligand functional groups, thus demonstrating the success of U modification.…”

“…In Figure d, the Zr 3d spectrum of UB material had an obvious blue shift compared with that of U. It was because the electrons migrated from the ligand to the metal node after the Br functional group of U was modified, and the metal node where the Zr atom was located obtained electrons, so the binding energy decreased. , In Figure e, a new diffraction peak appeared at 69.4 eV for the UB material, which was due to the formation of Br–Bi, and it was consistent with the diffraction peak position of conventional BiOBr. , In Figure f, the 159.3 and 164.6 eV diffraction peaks of the UB material in the Bi 4f spectrum corresponded to the characteristic peaks of bismuth oxide, , which corresponded well with the FTIR results above. It also illustrated that Bi was not supported on the UiO-66-Br surface in the form of atoms, but the synthesis reaction occurred and was generated in the form of BiOBr at the position of U ligand functional groups, thus demonstrating the success of U modification.…”

Carbonized Polymer Dots/Bi/β-Bi2O3 for Efficient Photosynthesis of H2O2 via Redox Dual Pathways

“…During the whole solvothermal process, partial Bi 3+ was reduced to Bi by EG. 25 As a result, the CPDs and Bi were deposited in situ on the surface of β-Bi 2 O 3 microspheres.…”

“…23 Similarly, a built-in electric field is constructed between the contact interfaces of semiconductors with different doping types (e.g., n−p junctions), 24 which can hinder the spatial charge separation and their migration into the solution. Therefore, it is necessary to introduce a suitable electron transport medium, such as Bi, 25 to form Schottky junctions or ohmic contacts with different semiconductors. 26 It promotes the harmonization of these built-in electric fields and realizes the effective separation of electrons and holes in the space charge layer, which greatly improves the photocatalytic activity of the composites.…”

Synergistic effects of rare earth doping and carbon quantum dots on BiOF/Bi2MoO6 heterojunctions for enhanced visible-near-infrared photocatalysis

“…(ii) The CQDs could be regarded as an electron reservoir to store electrons from Bi 2 MoO 6 , and reacted with O 2 to generate O 2 À . [62][63][64][65] (iii) The CQDs enabled converting NIR light into visible light, resulting in the increase of photocatalytic degradation under NIR light irradiation. Therefore, the combination of Z-scheme heterojunction, rare earth doping and quantum dots was realized in the CQDs/BFYT/B-2 composite to enhance full-spectrum photocatalysis.…”