Paraquat degradation by photocatalysis: experimental desing and optimization.
J Environ Sci Health B
; 56(6): 523-531, 2021.
Article
em En
| MEDLINE
| ID: mdl-33979272
ABSTRACT
This study describes the experimental design and optimization of application TiO2 catalysts doped with 0.5, 1, 1.5, 2.0% of Fe. The catalysts were prepared using the impregnation method applied in Paraquat herbicide degradation. The catalysts were characterized by the following techniques specific surface area and volume, mean pore diameter (BET method), scanning electron microscopy and photoacoustic spectroscopy. The characterization presented results indicating that both calcination temperature and the increase nominal metallic load affected by the structure of catalysts, changing the textural properties, as well as the band gap. The catalyst that presented the best herbicide removal percentage was TiO2 calcined at 773 K with removal of 90.2%. However, according to the experimental design and optimization, both variables (calcination temperature and Fe percentage) are significant in the process. In addition, a positive effect was found in the interaction between the two variables. The values show that a third order kinetic model better described the Paraquat photocatalytic degradation.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Paraquat
/
Titânio
/
Raios Ultravioleta
/
Herbicidas
/
Ferro
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
J Environ Sci Health B
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Brasil