Although self-polarized piezoelectric semiconductor photocatalysts significantly enhance the separation of internally generated photocarriers, their photocatalytic performance is constrained by insufficient internal polarisation and a wide bandgap. Additionally, the low concentration of oxygen in contaminated water limits the effectiveness of such photocatalysts. To the best of our knowledge, this study was the first to determine that the piezoelectric properties of BiMoO (BMO), was due to the polarisation displacement of the MoO octahedron that occurred along the x-axis, as revealed through density functional theory (DFT) calculations. Subsequently, the self-polarisation characteristics of BMO were enhanced and the bandgap was reduced through Fe doping, as confirmed via atomic force microscopy, hysteresis loop measurements and DFT analysis, resulting in an increase in surface potential from 30.41 to 46.80 mV. Furthermore, an S-scheme WO/BiMoO:Fe heterojunction was developed to improve the surface separation of photoelectron-hole pairs. The piezoelectric photocatalytic performance of this sample was evaluated through the degradation of rhodamine B (RhB) and oxygen generation. Results indicated that the degradation rate of RhB reached 98.63 % within 25 min under the synergistic influence of light and ultrasound, which was 1.85 and 9.60 times higher than those of BiMoO and WO, respectively. Furthermore, the optimal oxygen production efficiency was 167.41 µmol·g·h. This study provides a novel approach for designing more efficient piezoelectric photocatalysts.
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http://dx.doi.org/10.1016/j.jcis.2024.12.086 | DOI Listing |
J Hazard Mater
December 2024
Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313000, China; School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China. Electronic address:
Photocatalytic technology provides a new approach for the harmless treatment of low concentration NO in the atmosphere. The development of high-performance semiconductor materials to improve the light absorption efficiency and the separation efficiency of photogenerated carriers is the focus of the research. Bismuth oxybismuth sulfate (BiOSO) shows significant potential for photocatalytic NO purification due to its unique electronic and layered structure.
View Article and Find Full Text PDFJ Colloid Interface Sci
December 2024
School of Environmental and Chemical Engineering, Jiangmen Key Laboratory of Synthetic Chemistry and Cleaner Production, Institute of Carbon Peaking and Carbon Neutralization, Wuyi University, Jiangmen 529020, China; Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang 515200, China. Electronic address:
Although Z-scheme heterojunction composites have been widely studied in photocatalysis, in-depth investigation of oxygen vacancies (Ov) in the Z-scheme photocatalysts is still rare. Herein, an oxygen vacancies modified NU-1000/BiOCl-Ov composite with Z-scheme heterojunction was rationally designed and fabricated. The combination of X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) experiment verified the presence of oxygen vacancies, meanwhile the Z-scheme charge transfer across the heterojunction interface was confirmed in detail by the in situ-XPS, Kelvin probe force microscope (KPFM) studies, ultraviolet photoelectron spectroscopy (UPS), EPR radical capture experiment, as well as density functional theory (DFT) calculation.
View Article and Find Full Text PDFEnviron Res
December 2024
School of Chemistry and Chemical Engineering, Guangxi Minzu University. Nanning 530006 China.
At present, the mechanism difference between tetragonal BiVO (t-BiVO) and monoclinic BiVO (m-BiVO) coupled peroxymonosulfate (PMS) to realize photocatalysis is still unclear. In this study, m-BiVO and t-BiVO were obtained by adjusting the bismuth-vanadium ratio in the precursor solution (Bi:V=3:1; 1:1; 1:2 and 1:3). The results of photocatalytic experiments showed that both t-BiVO and m-BiVO had certain activation effects on PMS, and the prepared monoclinic B1V2 has the strongest photocatalytic performance.
View Article and Find Full Text PDFJ Colloid Interface Sci
December 2024
School of Materials Science & Engineering, University of Jinan, No. 336, West Road of Nan Xinzhuang, Jinan 250022, China. Electronic address:
Metal oxide photocatalysts loaded with metal species are extremely important in photocatalysis. The physicochemical states of metal species, as well as the interaction between metal species and support, determine the transfer of charge carriers between the heterointerface, which has a significant impact on photocatalytic activity. Here, we prepared anatase TiO nanosheets (TIO) modified with different Ag species, including single atoms, clusters, and nanoparticles, using a ligand-mediated method.
View Article and Find Full Text PDFJ Colloid Interface Sci
December 2024
School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, PR China. Electronic address:
Construction of the photocatalysts with synergistic active sites holds great significance in enhancing the direct CO reduction coupled with HO oxidation under solar irradiation. This work demonstrates the fabrication of a dual-active-site catalyst (Ni-NiO/TiO) through in-situ formation and simultaneous modulation of Ni single atoms (Ni) and NiO clusters on porous TiO. Both Ni and NiO are characterized by X-ray absorption fine structure (XAFS) analyses and diffuse reflectance infrared Fourier transform spectroscopy using CO as a probe molecule (CO-DRIFTS).
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