| Texto completo | |
| Autor(es): |
Portela, Carolina Inacio
;
Brazil, Tayra Rodrigues
;
Mendonca, Thais Aline Prado
;
Santos, Elias Barros
;
Domingues, Raquel Aparecida
;
Vieira, Nirton Cristi Silva
;
Goncalves, Maraisa
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | DIAMOND AND RELATED MATERIALS; v. 139, p. 9-pg., 2023-09-19. |
| Resumo | |
In this study, we demonstrated the viability of the production of activated carbon (AC) from coffee husk waste and their activation using CaCl2. In addition, the prepared AC was used as support for TiO2, and the TiO2/AC composite was employed as a photocatalyst in the Victoria Blue B (VBB) photodegradation. Specifically, the coffee husk was carbonized at 800 degrees C for 1 h and then activated with CaCl2 at 850 degrees C, varying the heating time by 0.5, 1, 2, and 4 h. The activated carbons (ACs) treated within 1 and 2 h presented the highest surface area and were used to support TiO2 prepared by the sol-gel method. The surface area did not decrease after dispersion, keeping about 700 m(2).g(-1), which suggested the uniform distribution of TiO2 onto the surface of the ACs, confirmed by SEM and TEM analysis. In addition, TEM analyses revealed a small particle size distribution of TiO2 nanoparticles (3.4 nm for TiO2/AC_1_350 and 4.8 nm for TiO2/AC_2_350), indicating that they do not have enough dimensions to block the AC pores structure. X-ray diffraction, TGA, and XPS analyses revealed the combination of TiO2 nanoparticles with AC, generating a hybrid material. The photocatalytic activity of the TiO2/AC composite is very fast, removing about 99 % of the VBB dye after 120 min of photocatalytic degradation. The recyclability of the TiO2/AC catalyst was also evaluated in three consecutive reactions, showing that the nanocomposite could be used for multiple degradations without a decrease in photocatalytic activity. Thus, this study proved the feasibility of using coffee husk wastes for AC preparation and its use as a photocatalyst in conjunction with TiO2. (AU) | |
| Processo FAPESP: | 21/02354-0 - Preparação e caracterização de carvão ativado para aplicação como suporte de fotocatalisadores |
| Beneficiário: | Carolina Inácio Portela |
| Modalidade de apoio: | Bolsas no Brasil - Programa Capacitação - Treinamento Técnico |
| Processo FAPESP: | 19/13471-8 - Sistemas multifuncionais 3D para aplicações em tecnologias ambientalmente sustentáveis |
| Beneficiário: | Maraisa Gonçalves |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |