Effect of copolymerization agents on the efficiency of carbon nitride photocatalysts for the selective synthesis of p-anisaldehyde

• Type: Article in International Scientific Journal
• Date: 2025

Authors

Fernandes, RA (Author) Other; Barros, MA (Author) Other; Sampaio, MJ (Author) Other; Faria, JL (Author) Other; Claudia G Silva (Author) FEUP

Journal

Title: Journal of Photochemistry and Photobiology A: Chemistry

Vol. 462

ISSN: 1010-6030

Publisher: Elsevier

Indexing

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Associated Projects

SuN2Fuel - Produção foto-assistida de combustíveis verdes baseados em amoníaco

Other information

Authenticus ID: P-017-NAS

DOI: 10.1016/j.jphotochem.2024.116184

Abstract (EN): Graphite-like carbon nitride-based catalysts were prepared through the thermal copolymerization of dicyandiamide and organic compounds, namely barbituric acid, 2-aminobenzonitrile, and 2-aminothiophene-3-carbonitrile as copolymerization agents. The obtained materials were subjected to a thermal post-treatment at 500 degrees C. According to SEM micrographs, the addition of a copolymerization agent promotes the appearance of defects on the surface of bulk GCN due to the presence of nitrogen vacancies (revealed by XPS analyses). The thermal posttreatment resulted in an increased specific surface area due to the exfoliation of the pristine material. Materials were tested for the synthesis of p-anisaldehyde by photocatalytic oxidation of anysil alcohol under UV-LED irradiation. The materials prepared using barbituric acid as copolymerization agent presented enhanced activity compared to neat GCN, attributed to the high availability of nitrogen vacancies in the carbon nitride matrix. After 90 min of irradiation, the material produced with bartituric acid reached 93 % of anysil alcohol conversion and 89 % of yield towards p-anisaldehyde. After subjecting this material to a thermal post-treatment at 500 degrees C, 98 % of conversion and 96 % of yield were obtained just after 30 min of reaction. The reusability tests performed with both catalysts proved their operational stability after three consecutive runs.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11