Journal
RESEARCH ON CHEMICAL INTERMEDIATES
Volume 48, Issue 7, Pages 2837-2855Publisher
SPRINGER
DOI: 10.1007/s11164-022-04748-z
Keywords
g-C3N4; Photocatalysis; dual cocatalysts; Hydrogen evolution; peroxymonosulfate activation
Categories
Funding
- State Key Research Development Program of China [2016YFA0204200]
- National Natural Science Foundation of China [21822603, 21811540394, 5171101651, 21677048, 21773062, 21577036]
- Shanghai Pujiang Program [17PJD011]
- Fundamental Research Funds for the Central Universities [22A201514021]
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The low utilization of visible light and quick recombination of photo-generated electron-hole pairs hinder the photocatalytic performance of g-C3N4. The use of dual cocatalysts (Pt and MnO2) on modified g-C3N4 promotes carrier separation, significantly enhancing the photocatalytic hydrogen evolution performance and degradation of organic pollutants. This study provides a new strategy for the application of g-C3N4 with dual cocatalyst in H-2 production and environmental remediation.
The low utilization of visible light and quick recombination of photo-generated electron-hole pairs of g-C3N4 hinder the enhancement of its photocatalytic performance. Modification of g-C3N4 with dual cocatalysts can promote the spatial separation of carriers, thus showing good redox ability. Here, the efficient photocatalyst g-C3N4/MnO2/Pt with dual cocatalysts is prepared in two steps including calcination- and photo-deposition process. Pt and MnO2 nanoparticles are used as electron and hole collectors, respectively. The g-C3N4/MnO2/Pt composite is characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS). Compared with pure g-C3N4, the photocatalytic hydrogen (H-2) evolution performance of g-C3N4/MnO2/Pt is significantly enhanced. And the H-2 production yield of g-C3N4/MnO2/Pt is more than 8 times as high as that of g-C3N4/Pt. Meanwhile, the prepared photocatalyst can help promoting peroxymonosulfate activation to degrade organic pollutants. Its degradation performances for phenol, sulfadiazine, bisphenol A, Rhodamine B, and methyl orange are significantly improved, owing to the generation of reactive oxygen species. This work provides a new strategy for the application of photo-generated electrons of g-C3N4 with dual cocatalyst in H-2 evolution and environmental remediation.
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