A simple approach to synthesize g-C3N4 with high visible light photoactivity for hydrogen production

Martín-Ramos, Pablo; Martín‐Gil, Jesús; Dante, Roberto C.; Vaquero, F.; Navarro, R.M.; Fierro, J.L.G.

doi:10.1016/j.ijhydene.2015.04.063

Cited by 57 publications

(21 citation statements)

References 45 publications

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“…Otherwise, it would be impossible that same ratios of N to C, same XPS, XRD and particle morphologies could be obtained from different reagents. This would be similar to what happens with g-C 3 N 4 , which can be obtained from different reagents, but the final product is always the same [29][30][31][32][33]. This fact would reinforce our hypothesis that the material is more probably a polymer with imidazole and naphtapyridinic units [18].…”

Section: X-ray Diffraction Measurementssupporting

confidence: 80%

Comparison of the activities of C2N and BCNO towards Congo red degradation

Dante¹,

Martín-Ramos

Chamorro‐Posada

et al. 2019

Materials Chemistry and Physics

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An n-type organic carbon nitride semiconductor, C 2 N, was synthesized by the pyrolysis of uric acid, and its properties were investigated by scanning electron and transmission electron microscopies, X-ray powder diffraction, and vibrational, UV-visible and X-ray photoelectron spectroscopies. This novel material, composed of crystalline flakes, featured a broad absorption centered at 700 nm, possibly due to charge transfer, and a 2.49 eV band gap. Its catalytic performance was assessed for the treatment of effluents with the diazo dye Congo red, comparing it with that of boron carbon nitrogen oxide, BCNO. Both wide band gap semiconductors exhibited decolorizing activity in the dark, although the mechanisms were different and were not photocatalytic: BCNO was more effective towards the adsorptioncoordination due to the presence of B-O, while C 2 N was effective towards the adsorption and the advancement of the oxidation reaction. Their kinetic constants (0.19 and 0.02 min-1 for BCNO and C 2 N, respectively) were comparable to those of intermetallic compounds studied for azo dyes degradation in dark conditions. In view of the high color removal efficiency (97% after 20 min) and good reusability of BCNO, this study suggests a potential application of this catalyst for wastewater treatment, alone or in combination with C 2 N.

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Section: X-ray Diffraction Measurementssupporting

confidence: 80%

Comparison of the activities of C2N and BCNO towards Congo red degradation

Dante¹,

Martín-Ramos

Chamorro‐Posada

et al. 2019

Materials Chemistry and Physics

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“…The polymer is composed of carbon and nitrogen, both of which are earth-abundant elements. Meanwhile, subsequent studies have shown that GCN-based photocatalysts are effective for various applications, such as contaminant decompositions [14,15], hydrogen evolution reactions (HER) [16][17][18], oxygen evolution reactions (OER) [19], CO 2 reduction [20], bioimaging and electricity generation. Yet, the low electrical conduction of the pristine GCN and the rapid photoelectron depletion cause the undesirable photon harvesting [21].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen-doped Carbon Nanospheres-Modified Graphitic Carbon Nitride with Outstanding Photocatalytic Activity

et al. 2020

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HIGHLIGHTS• Monodisperse nitrogen-doped carbon nanospheres were synthesized and loaded onto graphitic carbon nitride and the composites show outstanding photocatalytic activity.• Improved sulfachloropyridazine degradation is consistent with density functional theory calculation..ABSTRACT Metals and metal oxides are widely used as photo/ electro-catalysts for environmental remediation. However, there are many issues related to these metal-based catalysts for practical applications, such as high cost and detrimental environmental impact due to metal leaching. Carbon-based catalysts have the potential to overcome these limitations. In this study, monodisperse nitrogen-doped carbon nanospheres (NCs) were synthesized and loaded onto graphitic carbon nitride (g-C 3 N 4 , GCN) via a facile hydrothermal method for photocatalytic removal of sulfachloropyridazine (SCP). The prepared metal-free GCN-NC exhibited remarkably enhanced efficiency in SCP degradation. The nitrogen content in NC critically influences the physicochemical properties and performances of the resultant hybrids. The optimum nitrogen doping concentration was identified at 6.0 wt%. The SCP removal rates can be improved by a factor of 4.7 and 3.2, under UV and visible lights, by the GCN-NC composite due to the enhanced charge mobility and visible light harvesting. The mechanism of the improved photocatalytic performance and band structure alternation were further investigated by density functional theory (DFT) calculations. The DFT results confirm the high capability of the GCN-NC hybrids to activate the electron-hole pairs by reducing the band gap energy and efficiently separating electron/hole pairs. Superoxide and hydroxyl radicals are subsequently produced, leading to the efficient SCP removal.

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“…As the pyrolysis temperature increases, the color of the LTDP samples gradually changes from yellowish to yellow at 5 GPa and 600 °C and black at 5 GPa and 700 °C ( Figure 2 ). The reported band gap energies of g-C 3 N 4 range from 2.4 to 2.85 eV depending on different preparation conditions [ 31 , 32 , 33 , 34 , 35 ]. It is smaller than that of melamine [ 36 , 37 ].…”

Section: Resultsmentioning

confidence: 99%

Investigation on the Stability of Derivative Melam from Melamine Pyrolysis under High Pressure

Yuan

Luo

et al. 2018

Nanomaterials

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Although various kinds of carbon nitride precursors have been proposed, s-triazine-based structures are hardly reported because of their unfavorable energy, higher than that of heptazine-based ones. In this study, we investigate the thermal stability of s-triazine-based melam processed at a high pressure of 5 GPa and a temperature of 400–700 °C and complete the analyses of the composition and structure of the treated samples through X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and elemental analyses (EA). Results show that melam can stably exist up to 600 °C at 5 GPa. XRD and FTIR analyses reveal that residual melamine can be pyrolyzed into melam as temperature increases from 400 °C to 600 °C at a high pressure, suggesting that melam may be purified through high-pressure pyrolysis. Further melam polymerization at a higher pressure is a promising strategy for the preparation of s-triazine-based carbon nitride precursors used for bulk carbon nitride synthesis.

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A simple approach to synthesize g-C3N4 with high visible light photoactivity for hydrogen production

Cited by 57 publications

References 45 publications

Comparison of the activities of C2N and BCNO towards Congo red degradation

Comparison of the activities of C2N and BCNO towards Congo red degradation

Nitrogen-doped Carbon Nanospheres-Modified Graphitic Carbon Nitride with Outstanding Photocatalytic Activity

Investigation on the Stability of Derivative Melam from Melamine Pyrolysis under High Pressure

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