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Article

Photocatalytic H2 Evolution, CO2 Reduction, and NOx Oxidation by Highly Exfoliated g-C3N4

1
Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research “Demokritos”, 15341 Athens, Greece
2
Institute of Environmental Technology, VŠB-Technical University of Ostrava, 17. listopadu 15, 708 00 Ostrava-Poruba, Czech Republic
*
Authors to whom correspondence should be addressed.
Catalysts 2020, 10(10), 1147; https://doi.org/10.3390/catal10101147
Received: 17 August 2020 / Revised: 30 September 2020 / Accepted: 1 October 2020 / Published: 3 October 2020
(This article belongs to the Special Issue Photocatalytic Reduction of CO2)
g-C3N4, with specific surface area up to 513 m2/g, was prepared via three successive thermal treatments at 550 °C in air with gradual precursor mass decrease. The obtained bulk and exfoliated (1ex, 2ex and 3ex) g-C3N4 were characterized and tested as photocatalysts for H2 production, CO2 reduction and NOx oxidation. The exfoliated samples demonstrated graphene-like morphology with detached (2ex) and sponge-like framework (3ex) of layers. The surface area increased drastically from 20 m2/g (bulk) to 513 m2/g (3ex). The band gap (Eg) increased gradually from 2.70 to 3.04 eV. Superoxide radicals (·O2) were mainly formed under UV and visible light. In comparison to the bulk, the exfoliated g-C3N4 demonstrated significant increase in H2 evolution (~6 times), CO2 reduction (~3 times) and NOx oxidation (~4 times) under UV light. Despite the Eg widening, the photocatalytic performance of the exfoliated g-C3N4 under visible light was improved too. The results were related to the large surface area and low e-h+ recombination. The highly exfoliated g-C3N4 demonstrated selectivity towards H2 evolution reactions. View Full-Text
Keywords: g-C3N4 exfoliation; photocatalysis; H2 evolution; CO2 reduction; NOx oxidation g-C3N4 exfoliation; photocatalysis; H2 evolution; CO2 reduction; NOx oxidation
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MDPI and ACS Style

Todorova, N.; Papailias, I.; Giannakopoulou, T.; Ioannidis, N.; Boukos, N.; Dallas, P.; Edelmannová, M.; Reli, M.; Kočí, K.; Trapalis, C. Photocatalytic H2 Evolution, CO2 Reduction, and NOx Oxidation by Highly Exfoliated g-C3N4. Catalysts 2020, 10, 1147. https://doi.org/10.3390/catal10101147

AMA Style

Todorova N, Papailias I, Giannakopoulou T, Ioannidis N, Boukos N, Dallas P, Edelmannová M, Reli M, Kočí K, Trapalis C. Photocatalytic H2 Evolution, CO2 Reduction, and NOx Oxidation by Highly Exfoliated g-C3N4. Catalysts. 2020; 10(10):1147. https://doi.org/10.3390/catal10101147

Chicago/Turabian Style

Todorova, Nadia; Papailias, Ilias; Giannakopoulou, Tatiana; Ioannidis, Nikolaos; Boukos, Nikos; Dallas, Panagiotis; Edelmannová, Miroslava; Reli, Martin; Kočí, Kamila; Trapalis, Christos. 2020. "Photocatalytic H2 Evolution, CO2 Reduction, and NOx Oxidation by Highly Exfoliated g-C3N4" Catalysts 10, no. 10: 1147. https://doi.org/10.3390/catal10101147

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