Novel and inexpensive Nb2O5/tannin-formaldehyde xerogel composites as substitutes for titanium dioxide in photocatalytic processes

Autor(es)

de Moraes, Nicolas Perciani ^[1] ; Bacetto, Leticia Araujo ^[1] ; Paiva, Livia Kent ^[1] ; dos Santos, Gabriela Spirandelli ^[1] ; Caetano Pinto da Silva, Maria Lucia ^[1] ; Rodrigues, Liana Alvares ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Chem Engn, Engn Sch Lorena, EEL, Campinho Municipal Rd S-N, BR-12602810 Lorena, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Sol-Gel Science and Technology; v. 89, n. 2, p. 571-585, FEB 2019.
• Citações Web of Science: 1

Resumo

This project studied the preparation of new Nb2O5/tannin-formaldehyde xerogel composites (XTF-wNb) for photocatalytical applications. The choice of tannin biomass and niobium recycled scraps as precursors is aimed at reducing costs and environmental impacts. The composites were characterized by diffuse reflectance spectroscopy (DR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), infrared spectroscopy (IR), and X-ray diffraction (XRD). The photocatalytic properties of the composites were evaluated by methylene blue decomposition. The influence of the catalyst dosage and the initial concentration of dye in the adsorption and photocatalysis processes were studied. The X-ray profiles of the XTF-wNb show the presence of niobic acid in the structure of the materials, proving the presence of the inorganic oxide in the matrix of these composites. The tannin/Nb ratio had a significant influence on the morphology of the formed composites, causing changes in the shape and size of the particles composing each material. All materials have pH(PZC)<5. The XTF-24Nb was the most effective photocatalyst, its photocatalytic efficiency superior to the one of titanium dioxide, evidencing the beneficial effect of the xerogel coupling on the photocatalytic properties of the material. (AU)

• Processo FAPESP: 15/08995-7 - Preparação, modificação e avaliação catalítica de fotocatalisadores à base de Nb2O5
• Beneficiário: Liana Alvares Rodrigues
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/04244-0 - Preparação, modificação e avaliação catalítica de fotocatalisadores híbridos TiO2/xerogel de carbono
• Beneficiário: Nicolas Perciani de Moraes
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 16/20920-5 - Fotocatálise heterogênea aplicada na degradação de poluentes orgânicos utilizando catalisador híbrido de óxido de zinco-xerogel de carbono
• Beneficiário: Nicolas Perciani de Moraes
• Modalidade de apoio: Bolsas no Brasil - Mestrado