Construction of oxygen vacancy assisted Z-scheme BiO2−x/BiOBr heterojunction for LED light pollutants degradation and bacteria inactivation

Bismuth Gadolinium Oxychloride with a Remarkable Visible‐Light‐Responsive O2 Evolution Activity Promoted by Iodine Doping

“…As shown in Figure 3d, for Cl 2p, the peaks with binding energies of 198.0±0.1 and 199.6±0.1 eV are also in good accordance with the published data [25] . The peaks located at 68.4 and 69.4 eV (Figure 3e) can be ascribed to Br 3d signals for 1Br−Bi 2 GdO 4 Cl [22b,25] . For 1I−Bi 2 GdO 4 Cl, the peaks located at 619.0 and 630.5 eV can be ascribed to I 3d (Figure 3f) [26] .…”

In2O3 Nanoparticle/Bi4O5Br2 Nanosheet S-Scheme Heterojunctions with Interfacial Oxygen Vacancies for Photocatalytic Degradation of Tetracycline

“…Due to their layered architectures, Bi-based materials such as Bi 2 XO 6 (X = W, Mo), BiVO 4 , Bi x O y X z (X = Cl, Br, I), and others exhibit large internal electric fields and asymmetric polarization effects, resulting in high charge separation efficiency. , Bismuth-enriched oxybromide (Bi 4 O 5 Br 2 ) is a viable photocatalysis candidate because it has outstanding chemical stability, appropriate energy band structure, and excellent photoresponsiveness. , In addition, Bi 4 O 5 Br 2 nanosheets with weak Bi–O bonds can easily introduce oxygen vacancies (OVs), which can form new defective energy levels in the forbidden band, thus reducing the difficulty of e – transition to the conduction band and improving the utilization of sunlight. , However, Bi 4 O 5 Br 2 still suffers from defects such as limited separation of photogenerated carriers and small specific surface areas, resulting in its photocatalytic activity not being sufficient for practical applications . Researchers have proposed modification methods including morphological modulation, heterostructure fabrication, crystal plane modulation, elemental doping, and noble metal deposition to enhance the photocatalytic activity of the catalysts. , Among them, coupling two semiconductors to construct heterojunctions is considered a feasible strategy to enhance catalyst activity. , Compared to conventional type-II heterojunction, the S-scheme heterojunction can eliminate useless e – and h + , allowing e – with strong reduction ability and h + with strong oxidation capacity to remain in the reaction and efficiently boost catalytic activity. ,,− In addition, when a heterojunction is formed, the lattice mismatch caused by the different crystal structures from different semiconductors at the heterojunction interface can induce the formation of interface OVs, which is beneficial to reduce the resistance of photogenerated charge transport between different components. − Therefore, the selection of suitable semiconductors coupled with Bi 4 O 5 Br 2 to construct S-scheme heterojunctions with abundant interface OVs is one of the effective strategies to prepare highly active photocatalysts.…”

Visible light‐driven Z‐scheme NiO/BiO2−x heterojunction for efficient degradation of organic pollutants in water

“…The peaks of BiO 2−x (JCPDS NO.47‐1057) located at 28.08°, 32.47°, 46.86°, 55.62°, 58.37°, 68.51°, 75.64°, and 77.98°, corresponding to (111), (200), (220), (311), (222), (400), (331), and (420) crystal planes, respectively. [ 26 ] The characteristic peaks at 37.2°, 43.3°, 62.9°, 75.4°, and 79.4° are attributed to the (111), (200), (220), (311), and (222) crystal planes of NiO (JCPDS NO.47‐1049), respectively. [ 27 ] The characteristic diffraction peaks of NiO and BiO 2−x can be observed in the XRD spectrum of NiO/BiO 2−x composites, which indicates that NiO and BiO 2−x coexist in the composites.…”