Bacterial cellulose-SiO2@TiO2 organic-inorganic hybrid membranes with self-cleaning properties

Author(s)

Monteiro, A. S. ; Domeneguetti, R. R. ; Man, M. Wong Chi ; Barud, H. S. ; Teixeira-Neto, E. ; Ribeiro, S. J. L.

• Document type: Journal article
• Source: Journal of Sol-Gel Science and Technology; v. 89, n. 1, p. 10-pg., 2019-01-01.

Abstract

This work reports the preparation of bacterial cellulose (BC) membranes with self-cleaning properties. SiO2@TiO2 (anatase) spherical nanocomposites (around 50nm 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 30min). 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. [GRAPHICS] HighlightsDevelopment of novel functional bacterial cellulose membranes with self-cleaning properties.Decomposition of methyl violet 2B dye in solution through a photocatalytic process.High resistance to washing (self-cleaning performance).Original features of the membranes (color and texture) maintained.Significant reduction of cleaning actions, allowing a reduction in costs and greater durability of the bacterial cellulose membrane.Environmentally friendly cellulose membrane. (AU)

• FAPESP's process: 15/12908-2 - Development of colored silica nanoparticles of natural base, and its application in textile substrates
• Grantee: Andreia Sofia de Sousa Monteiro
• Support Opportunities: Scholarships in Brazil - Doctorate