Bacterial cellulose–SiO 2 @TiO 2 organic–inorganic hybrid membranes with self-cleaning properties

• Autor(a) principal: Monteiro, A. S. [UNESP]
• Data de Publicação: 2019
• Outros Autores: Domeneguetti, R. R. [UNESP], Wong Chi Man, M., Barud, H. S., Teixeira-Neto, E., Ribeiro, S. J.L. [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1007/s10971-018-4744-5; http://hdl.handle.net/11449/186873
• topic: Dip-coating; Functional bacterial cellulose membrane; Photocatalytic activity; Self-cleaning properties; SiO 2 @TiO 2 (anatase) nanocomposites; Spin-coating

Abstract: This work reports the preparation of bacterial cellulose (BC) membranes with self-cleaning properties. SiO 2 @TiO 2 (anatase) spherical nanocomposites (around 50 nm in diameter) were prepared by sol–gel process and were successfully immobilized into the BC membrane, in wet and dry states, by post-grafting method, following two different methodologies: dip-coating and spin-coating. Characterization techniques included Raman scattering, energy-dispersive X-ray spectroscopies (EDS), thermogravimetric analyses (TGA), and scanning electron microscopy (SEM). The photocatalytic activity was higher in the BC membrane in the wet state, presenting a good self-cleaning performance (fast methyl violet 2B dye decomposition in 30 min). The functional BC membranes with self-cleaning properties also presented high resistance to washing, high chemical stability, and the original features (color and texture) were maintained. [Figure not available: see fulltext.].