Synthesis and Characterization of N and Fe-Doped TiO2 Nanoparticles for 2,4-Dimethylaniline Mineralization

Autor(es)

Faustino, Emerson ; da Silva, Thalita Ferreira ; Cunha, Rebeca Fabbro ; Guelfi, Diego Roberto Vieira ; Cavalheri, Priscila Sabioni ; de Oliveira, Silvio Cesar ; Caires, Anderson Rodrigues Lima ; Casagrande, Gleison Antonio ; Cavalcante, Rodrigo Pereira ; Junior Amilcar, Machulek

• Tipo de documento: Artigo Científico
• Fonte: NANOMATERIALS; v. 12, n. 15, p. 16-pg., 2022-08-01.

Resumo

The present study aimed to evaluate the feasibility of developing low-cost N- and Fe-doped TiO2 photocatalysts for investigating the mineralization of 2,4-dimethylaniline (2,4-DMA). With a single anatase phase, the photocatalysts showed high thermal stability with mass losses of less than 2%. The predominant oxidative state is Ti4+, but there is presence of Ti3+ associated with oxygen vacancies. In materials with N, doping was interstitial in the NH3/NH4+ form and for doping with Fe, there was a presence of Fe-Ti bonds (indicating substitutional occupations). With an improved band gap energy from 3.16 eV to 2.82 eV the photoactivity of the photocatalysts was validated with an 18 W UVA lamp (340-415 nm) with a flux of 8.23 x 10(-6) Einstein s(-1). With a size of only 14.45 nm and a surface area of 84.73 m(2) g(-1), the photocatalyst doped with 0.0125% Fe mineralized 92% of the 2,4-DMA in just 180 min. While the 3% N photocatalyst with 12.27 nm had similar performance at only 360 min. Factors such as high surface area, mesoporous structure and improved E-bg, and absence of Fe peak in XPS analysis indicate that doping with 0.0125% Fe caused a modification in TiO2 structure. (AU)

• Processo FAPESP: 19/26210-8 - Investigação da contribuição dos processos oxidativos avançados no tratamento multibarreira de efluentes biotratados
• Beneficiário: Rodrigo Pereira Cavalcante
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado