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da Silva, Thais Caroline Almeida ; Marchiori, Leonardo ; Mattos, Bianca Oliveira ; Ullah, Sajjad ; Barud, Hernane da Silva ; Domeneguetti, Rafael Romano ; Rojas-Mantilla, Hernan Dario ; Zanoni, Maria Valnice Boldrin ; Rodrigues-Filho, Ubirajara Pereira ; Ferreira-Neto, Elias Paiva ; Ribeiro, Sidney Jose Lima

• Tipo de documento: Artigo Científico
• Fonte: ACS APPLIED MATERIALS & INTERFACES; v. 15, n. 19, p. 14-pg., 2023-05-08.

Resumo

This study explores the use of silica-coated bacterial nanocellulose (BC) scaffolds with bulk macroscopic yet nanometric internal pores/structures as functional supports for high surface area titania aerogel photocatalysts to design flexible, self-standing, porous, and recyclable BC@SiO2-TiO2 hybrid organic-inorganic aerogel membranes for effective in-flow photo-assisted removal of organic pollutants. The hybrid aerogels were prepared by sequential sol-gel deposition of the SiO2 layer over BC, followed by coating of the resulting BC@SiO2 membranes with a porous titania aerogel overlayer of high surface area using epoxide-driven gelation, hydrothermal crystallization, and subsequent supercritical drying. The silica interlayer between the nanocellulose biopolymer scaffold and the titania photocatalyst was found to greatly influence the structure and composition, particularly the TiO2 loading, of the prepared hybrid aerogel membranes, allowing the development of photochemically stable aerogel materials with increased surface area/pore volume and higher photocatalytic activity. The optimized BC@SiO2-TiO2 hybrid aerogel showed up to 12 times faster in-flow photocatalytic removal of methylene blue dye from aqueous solution in comparison with bare BC/TiO2 aerogels and outperformed most of the supported-titania materials reported earlier. Moreover, the developed hybrid aerogels were successfully employed to remove sertraline drug, a model emergent contaminant, from aqueous solution, thus further demonstrating their potential for water purification. (AU)

• Processo FAPESP: 15/22828-6 - Ultrapassando as fronteiras de fibras opticas: Da Fotonica até optogenetica e monoteramento de meio ambiente.
• Beneficiário: Younes Messaddeq
• Modalidade de apoio: Auxílio à Pesquisa - Programa SPEC
• Processo FAPESP: 18/01934-0 - Aerogéis de Dissulfetos de metais de transição e Celulose bacteriana: Nanomateriais bifuncionais com propriedades fotocatalíticas e adsortivas para aplicações ambientais
• Beneficiário: Elias Paiva Ferreira Neto
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/50945-4 - Inct 2014 - instituto nacional de tecnologia alternativas para deteccao, avaliacao toxicologica e remocao de micropoluentes e radioativos.
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/07276-1 - CEPOF - Centro de Pesquisa em Óptica e Fotônica
• Beneficiário: Vanderlei Salvador Bagnato
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs