| Texto completo | |
| Autor(es): |
de Moraes, Nicolas Perciani
[1]
;
Goes, Clarice Moreira
[1]
;
Rocha, Robson da Silva
[1]
;
Vicente Gouvea, Maira Elizabeth
[1]
;
de Siervo, Abner
[2]
;
Caetano Pinto da Silva, Maria Lucia
[1]
;
Rodrigues, Liana Alvares
[1]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Escola Engn Lorena EEL, Dept Chem Engn, Estr Municipal Campinho S-N, Lorena, SP - Brazil
[2] Univ Estadual Campinas, Inst Phys Gleb Wataghin, Appl Phys Dept, Campinas, SP - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Chemical Engineering Communications; SEP 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
This work aimed to evidence the potential use of tannin-based carbon xerogel as a co-catalyst in photocatalytic processes based on solar light. Specifically, the tin (IV) oxide/carbon xerogel photocatalyst (SnO2/XC) was developed with the objective of improving the photoactivity of tin (IV) oxide (SnO2) under simulated solar light. The photocatalytic efficiency was determined by the degradation of the 4-chlorophenol molecule. The synthesis proposed in this work is based on a simple one-pot precipitation reaction, using black wattle tannin and tin chloride as precursors. The materials synthesized were characterized by X-ray diffractometry, diffuse reflectance spectroscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, energy dispersive spectroscopy, scanning electron microscopy, adsorption isotherms, and chronoamperometry. Results showed the presence of tetragonal SnO2 in the samples synthesized. Carbon xerogel addition led to an increased specific surface area (55% higher) and lower bandgap energy (from 3.64 eV to 3.58 eV). The photocatalytic evaluation shows that the SnO2/XC composite has superior photocatalytic efficiency (44% removal vs 20% for the SnO2), obtaining a reaction rate constant (k(app) = 0.00172 min(-1)) which is nearly double the one obtained by the pure SnO2 (k(app) = 0.00096 min(-1)). The chronoamperometric results indicated that the proposed modification enhanced the photocurrent generation and charge separation in the SnO2/XC, facilitating the formation of active radicals during the process and further degrading the reaction intermediates formed during the photodegradation process. (AU) | |
| Processo FAPESP: | 07/54829-5 - Estrutura eletrônica e geométrica de nano materiais: um estudo por radiação sincroton |
| Beneficiário: | Richard Landers |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 18/16360-0 - Desenvolvimento de compósitos ternários ZnO/Bi2O3/Xerogel de carbono como fotocatalisadores para a degradação de poluentes orgânicos persistentes |
| Beneficiário: | Nicolas Perciani de Moraes |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 07/08244-5 - Estudo das propriedades magnéticas de filmes ultrafinos e nanopartículas de Pd e PdAu via XMCD |
| Beneficiário: | Abner de Siervo |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 19/03641-3 - Fotodegradação de 4-clorofenol usando compósito ZnO/SnO2/xerogel de carbono como catalisador |
| Beneficiário: | Clarice Moreira Goes |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |