Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Influence of High Temperature Synthesis on the Structure of Graphitic Carbon Nitride and Its Hydrogen Generation Ability

Abstract : Graphitic carbon nitride (g-C3N4) was obtained by thermal polymerization of dicyandiamide, thiourea or melamine at high temperatures (550 and 600 °C), using different heating rates (2 or 10 °C min−1) and synthesis times (0 or 4 h). The effects of the synthesis conditions and type of the precursor on the efficiency of g-C3N4 were studied. The most efficient was the synthesis from dicyandiamide, 53%, while the efficiency in the process of synthesis from melamine and thiourea were much smaller, 26% and 11%, respectively. On the basis of the results provided by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–vis), thermogravimetric analysis (TGA), elemental analysis (EA), the best precursor and the optimum conditions of synthesis of g-C3N4 were identified to get the product of the most stable structure, the highest degree of ordering and condensation of structure and finally the highest photocatalytic activity. It was found that as the proton concentration decreased and the degree of condensation increased, the hydrogen yields during the photocatalytic decomposition of water–methanol solution were significantly enhanced. The generation of hydrogen was 1200 µmol g−1 and the selectivity towards hydrogen of more than 98%.
Type de document :
Article dans une revue
Domaine :
Liste complète des métadonnées

https://hal.univ-lille.fr/hal-03024496
Contributeur : Lilloa Université de Lille <>
Soumis le : mercredi 25 novembre 2020 - 19:10:02
Dernière modification le : mardi 15 décembre 2020 - 10:44:02

Fichier

materials-13-02756.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Licence


Distributed under a Creative Commons Paternité 4.0 International License

Identifiants

Collections

Citation

Emilia Alwin, Kamila Kočí, Robert Wojcieszak, Michał Zieliński, Miroslava Edelmannová, et al.. Influence of High Temperature Synthesis on the Structure of Graphitic Carbon Nitride and Its Hydrogen Generation Ability. Materials, MDPI, 2020, Materials, 13 (12), pp.2756. ⟨10.3390/ma13122756⟩. ⟨hal-03024496⟩

Partager

Métriques

Consultations de la notice

21

Téléchargements de fichiers

40