White and Red Brazilian Sao Simao's Kaolinite-TiO2 Nanocomposites as Catalysts for Toluene Photodegradation from Aqueous Solutions

Autor(es):Mostrar menos -

Mora, Lucas D. ^[1] ; Bonfim, Larissa F. ^[1] ; Barbosa, Lorrana V. ^[1] ; da Silva, Tiago H. ^[1] ; Nassar, Eduardo J. ^[1] ; Ciuffi, Katia J. ^[1] ; Gonzalez, Beatriz ^[2] ; Vicente, Miguel A. ^[2] ; Trujillano, Raquel ^[2] ; Rives, Vicente ^[2] ; Perez-Bernal, Maria Elena ^[2] ; Korili, Sophia ^[3] ; Gil, Antonio ^[3] ; de Faria, Emerson H. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Franca Unifran, Grp Pesquisas Mat Lamelares Hibridos GPMatLam, Ave Dr Armando Salles Oliveira 201, Parque Univ, BR-14404600 Franca, SP - Brazil

^[2] Univ Salamanca, GIR QUESCAT, Dept Quim Inorgan, E-37008 Salamanca - Spain

^[3] Univ Publ Navarra, INAMAT, Dept Ciencias, E-31006 Pamplona - Spain

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS; v. 12, n. 23 DEC 2019.
• Citações Web of Science: 0

Resumo

The presence of volatile organic compounds in groundwater is a major concern when it is used as a drinking water source because many of these compounds can adversely affect human health. This work reports on the preparation and characterization of white and red Brazilian Sao Simao's kaolinite-TiO2 nanocomposites and their use as catalysts in the photochemical degradation of toluene, a significant volatile organic compound. The nanocomposites were prepared by a sol-gel procedure, using titanium bis(triethanolaminate)diisopropoxide as a precursor. Thermal treatments of the nanocomposites led to different polymorphic titania phases, while the clay changed from kaolinite to metakaolinite. This structural evolution strongly affected the photocatalytic degradation behavior-all the solids efficiently degraded toluene and the solid calcined at 400 degrees C, formed by kaolinite and anatase, showed the best behavior (90% degradation). On extending the photochemical treatment up to 48 h, high mineralization levels were reached. The advantage of photodegradation using the nanocomposites was confirmed by comparing the results from isolated components (titanium dioxide and kaolinite) to observe that the nanocomposites displayed fundamental importance to the photodegradation pathways of toluene. (AU)

• Processo FAPESP: 12/11673-3 - Obtenção de filmes finos por spin e dip-coating usando a metodologia sol-gel
• Beneficiário: Eduardo José Nassar
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/19523-3 - Materiais biohíbridos funcionais baseados em argilas lamelares e/ou fibrosas com aplicações multifacetadas
• Beneficiário: Emerson Henrique de Faria
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 98/11022-3 - Oxidacao catalitica biomimetica.
• Beneficiário: Katia Jorge Ciuffi Pires
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/15482-1 - Novas estratégias para o reaproveitamento de subprodutos de curtumes para a obtenção de materiais porosos funcionais de alto valor agregado
• Beneficiário: Emerson Henrique de Faria
• Modalidade de apoio: Auxílio à Pesquisa - Regular