The photocatalytic reduction of CO with HO into valuable chemicals is a sustainable carbon-neutral technology for renewable energy; however, the photocatalytic activity and product selectivity remain challenging. Herein, an S-scheme heterojunction photocatalyst with superior CO photoreduction performance─porous CN (CN) nanosheets anchored with zinc(II) tetra(4-cyanophenyl)porphyrin (ZnTP) nanoassemblies (denoted as ZnTP/CN)─was designed and prepared via a simple self-assembly process. The constructed ZnTP/CN heterojunction had rich accessible active sites, improved CO absorption capacity, and high charge carrier separation efficiency caused by the S-scheme heterojunction. As a result, the obtained ZnTP/CN catalyst exhibited considerable activity for photocatalytic CO reduction, yielding CO with a generation rate of 19.4 μmol g·h and a high selectivity of 95.8%, which is much higher than that of pristine CN nanosheets (4.53 μmol g·h, 57.4%). In addition, theoretical calculations and in situ Fourier transform infrared spectra demonstrated that the Zn sites in the porphyrin unit favor CO activation and *COOH formation as well as CO desorption, thereby affording a high CO selectivity. This work provides insight into the design and fabrication of efficient S-scheme heterostructure photocatalysts for solar energy storage.
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http://dx.doi.org/10.1021/acsami.3c10503 | 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 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).
View Article and Find Full Text PDFACS Appl Mater Interfaces
December 2024
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.
In single-atomic photocatalyst systems, the spatial distribution of single atoms on heterojunctions and its impact on photocatalytic processes, particularly on carrier dynamics and the CO reduction process involving multielectron reactions, remains underexplored. To address this gap, a WO/TiO nanotube heterojunction with a spatially selective distribution of Au single atoms was developed using an oxygen vacancy anchoring strategy for CO photoreduction. By anchoring Au atoms onto the WO or TiO components, a substantial number of active sites are generated and the electron transfer pathways from the heterojunction toward Au sites are formed, thereby enhancing carrier separation and concentration.
View Article and Find Full Text PDFAdv Sci (Weinh)
December 2024
Soochow Institute for Energy and Materials InnovationS (SIEMIS), Soochow University, Suzhou, 215006, China.
Hydrogen peroxide (HO) is an important chemical in synthetic chemistry with huge demands. Photocatalytic synthesis of HO via oxygen reduction and water oxidation reactions (ORR and WOR) is considered as a promising and desirable solution for on-site applications. However, the efficiency of such a process is low due to the poor solubility of molecular oxygen and the rapid reverse reaction of hydroxyl radicals (OH) with hydrogen atoms (H).
View Article and Find Full Text PDFEnviron Res
December 2024
School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing, 400054, China. Electronic address:
The high concentration of metal compounds found in red mud (RM) can serve as cost-effective raw materials for photo Fenton catalysts in the treatment of organic dye wastewater. In this study, RM was modified with bagasse using a hydrothermal method to prepare a photo-Fenton catalyst. The degradation efficiency of Rhodamine (RhB) solution under different conditions was evaluated.
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