Photocatalytic and structure evaluation of g-C3N4/carbon microspheres and melam/dimelem intermediates under white LED and UVA-Vis irradiation

Rodríguez-Pérez, AP, Carneiro de Christan, RD, Imoski, R, da Cruz, LJ, Albach, B, Dalmolin, C, da Silveira Rampon, D, Santacruz, C, Sher, F ORCID: https://orcid.org/0000-0003-2890-5912, Ramsdorf, WA, Tentler Prola, LD and de Liz, MV, 2023. Photocatalytic and structure evaluation of g-C3N4/carbon microspheres and melam/dimelem intermediates under white LED and UVA-Vis irradiation. Journal of Solid State Chemistry, 328: 124294. ISSN 0022-4596

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Abstract

Despite the polymeric metal-free graphitic carbon nitride (g-C3N4) has been extensively studied for photodegradation, intermediate oligomers (melam/dimelem) can be generated during the polymerization process and it is a subject matter. The melem compounds feature active amino groups (-NH2) partially linked to one another, facilitating intermolecular reactions and alteration of the compound's structure. This study evaluated the synergic effect of carbon matrix on the physicochemical and electronic characteristics of g-C3N4 (CN) and melam/dimelem intermediates compounds by synthesis in situ of chitosan and CN precursors. The g-C3N4 were obtained using urea (U) and melamine (M), denoted as CN/U and CN/M, and the carbon microspheres, denoted as CN/CU and CN/CM. The characterizations suggest C–N sp2-hybridized bonds between the carbon ring from chitosan and the melam/dimelem unit, which may be highly activated either in the visible or UVA regions. An increase of 16% in photocatalytic efficiency for CN/CM material was observed by incorporating chitosan in the g-C3N4 using withe LED light. The carbon microspheres interact synergistically with the bulk g-C3N4 to form two-dimensional planes in which the charge carriers can move freely along the carbon ring structure. The carbon microspheres are an excellent option to separate the photocatalyst easily from the reaction mixture. Additionally, the photocatalytic degradation mechanism of RhB by carbon microspheres was also proposed.

Item Type:	Journal article
Publication Title:	Journal of Solid State Chemistry
Creators:	Rodríguez-Pérez, A.P., Carneiro de Christan, R.D., Imoski, R., da Cruz, L.J., Albach, B., Dalmolin, C., da Silveira Rampon, D., Santacruz, C., Sher, F., Ramsdorf, W.A., Tentler Prola, L.D. and de Liz, M.V.
Publisher:	Elsevier BV
Date:	December 2023
Volume:	328
ISSN:	0022-4596
Identifiers:	Number Type 10.1016/j.jssc.2023.124294 DOI 1826921 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Ward
Date Added:	01 Nov 2023 10:24
Last Modified:	28 Aug 2024 03:00
URI:	https://irep.ntu.ac.uk/id/eprint/50184

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