Post-Synthetic Derivatization of Graphitic Carbon Nitride with Methanesulfonyl Chloride: Synthesis, Characterization and Photocatalysis

Praus, Petr; Smýkalová, Aneta; Foniok, Kryštof; Velíšek, Petr; Cvejn, Daniel; Žádný, Jaroslav; Storch, Jan

doi:10.3390/nano10020193

Cited by 16 publications

(14 citation statements)

References 72 publications

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“…[ 8 ]). Compared to TiO 2 , the crystal size of the g-C 3 N 4 material is much lower (about 6 nm, detailed information given in [ 8 ]). The crystal size after exfoliation does not change.…”

Section: Resultsmentioning

confidence: 99%

“…The second couple of 2p binding energies corresponds to sulfur in a lower oxidation state (mesyl groups). A detailed description of XPS and FTIR spectra of g-C 3 N 4 has been reported previously [ 8 ].…”

Section: Resultsmentioning

confidence: 99%

“…Bulk, exfoliated and sulphur-containing C 3 N 4 structures had previously been characterized by various techniques (XRD, UV-VIS DRS, FTIR, BET, SEM, TEM, XPS [ 8 ], etc.).…”

Section: Methodsmentioning

confidence: 99%

“…In a previous work, Praus et al [ 8 ] developed a novel procedure based on the post-synthetic derivatization of g-C 3 N 4 with methanesulfonyl (mesyl (CH 3 SO 2 − ) chloride) and thus synthetized S-doped g-C 3 N 4 and exfoliated g-C 3 N 4. The obtained nanomaterials were characterized in detail but their photocatalytic activity was tested only in the liquid phase and by means of the decomposition of Acid Orange 7 under ultraviolet A (UVA) irradiation.…”

Section: Introductionmentioning

confidence: 99%

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Graphitic Carbon Nitride for Photocatalytic Air Treatment

et al. 2020

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Graphitic carbon nitride (g-C3N4) is a conjugated polymer, which recently drew a lot of attention as a metal-free and UV and visible light responsive photocatalyst in the field of solar energy conversion and environmental remediation. This is due to its appealing electronic band structure, high physicochemical stability and earth-abundant nature. In the present work, bulk g-C3N4 was synthesized by thermal decomposition of melamine. This material was further exfoliated by thermal treatment. S-doped samples were prepared from thiourea or further treatment of exfoliated g-C3N4 by mesylchloride. Synthesized materials were applied for photocatalytic removal of air pollutants (acetaldehyde and NOx) according to the ISO 22197 and ISO 22197-1 methodology. The efficiency of acetaldehyde removal under UV irradiation was negligible for all g-C3N4 samples. This can be explained by the fact that g-C3N4 under irradiation does not directly form hydroxyl radicals, which are the primary oxidation species in acetaldehyde oxidation. It was proved by electron paramagnetic resonance (EPR) spectroscopy that the dominant species formed on the irradiated surface of g-C3N4 was the superoxide radical. Its production was responsible for a very high NOx removal efficiency not only under UV irradiation (which was comparable with that of TiO2), but also under visible irradiation.

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“…[ 8 ]). Compared to TiO 2 , the crystal size of the g-C 3 N 4 material is much lower (about 6 nm, detailed information given in [ 8 ]). The crystal size after exfoliation does not change.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Bulk, exfoliated and sulphur-containing C 3 N 4 structures had previously been characterized by various techniques (XRD, UV-VIS DRS, FTIR, BET, SEM, TEM, XPS [ 8 ], etc.).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Graphitic Carbon Nitride for Photocatalytic Air Treatment

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“…The titration curves in Figure S6 demonstrate the big increase of pH in case of the treated bulk GCN nanomaterials likely due to the oxidation of weak acidic groups (-OH and >NH 2 + ) which were not able to neutralize added hydroxide. Hydroxide ions can be also exchanged with other anions in the GCN structure [ 74 ] and consumed by the neutralization of protonated nitrogen and amino groups of GCN [ 72 ].…”

Section: Resultsmentioning

confidence: 99%

Modification of Graphitic Carbon Nitride with Hydrogen Peroxide

et al. 2020

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Graphitic carbon nitride (GCN) was synthetized by heating melamine and then it was thermally exfoliated for 1–3 h in air. Both bulk and exfoliated GCN nanomaterials were treated in the 10–30% aqueous solutions of H2O2 for us to study their modification. The light absorption properties were observed by the reddish color and the red-shifts of their UV-Vis spectra. The content of oxygen increased and hydrogen peroxide was supposed to partially oxidize C-OH groups to C=O ones and to form C-O-C groups instead of edge C-NH-C ones. The GCN structure changes were not observed. However, a surface modification of the GCN materials was recognized by their changed photocatalytic activities tested by means of Acid Orange 7 (AO7) and Rhodamines B (RhB), zeta-potentials, and neutralization titration curves.

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