Amoxicillin photodegradation under visible light catalyzed by metal-free carbon nitride: An investigation of the influence of the structural defects

Autor(es)

Silva, Ingrid F. ^[1] ; Teixeira, Ivo F. ^[2] ; Rios, Regiane D. F. ^[1] ; do Nascimento, Gustavo M. ^[3] ; Binatti, Ildefonso ^[4] ; Victoriae, Henrique F. V. ^[5] ; Krambrock, Klaus ^[5] ; Cury, Luiz A. ^[5] ; Teixeira, Ana Paula C. ^[1] ; Stumpf, Humberto O. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Minas Gerais, Dept Quim, ICEx, BR-31270901 Belo Horizonte, MG - Brazil

^[2] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Fed ABC, Ctr Ciencias Nat & Humanas CCNH, BR-09210580 Santo Andre, SP - Brazil

^[4] Ctr Fed Educ Tecnol Minas Gerais, Dept Quim, BR-30421169 Belo Horizonte, MG - Brazil

^[5] Univ Fed Minas Gerais, Dept Fis, ICEx, BR-31270901 Belo Horizonte, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF HAZARDOUS MATERIALS; v. 401, JAN 5 2021.
• Citações Web of Science: 5

Resumo

Herein, the structural defects of metal-free polymeric carbon nitrides were controlled by making use of different precursors in their syntheses, i.e. melamine (CN-M) and thiourea (CN-T), as well as a 1:1 mixture of them (CN-1M:1 T). By controlling the structural defects, the electronic, morphological and chemical properties were modified. Additionally, the activities of synthesized PCNs were evaluated for amoxicillin photodegradation under visible light irradiation (16 mW cm(-2)). The results of photocatalytic tests showed that CN-T material has better efficiency (100 % removal within 48 h), which is directly related to the greater number of defects present in its structure with consequent improvement of electron-hole pairs separation efficiency. The CN-T material showed excellent stability with only 13 % decrease in its photocatalytic activity after the third cycle. A mechanism for amoxicillin degradation by CN-T was proposed based on the ESI-MS and the in situ EPR allied with spin trapping method investigations. (AU)

• Processo FAPESP: 17/50118-9 - Plasmonic nanoparticles supported on semiconductors and its applications in photocatalysis
• Beneficiário: Ivo Freitas Teixeira
• Modalidade de apoio: Auxílio à Pesquisa - Regular