Bacterial cellulose–SiO 2 @TiO 2 organic–inorganic hybrid membranes with self-cleaning properties
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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.].
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Dip-coating, Functional bacterial cellulose membrane, Photocatalytic activity, Self-cleaning properties, SiO 2 @TiO 2 (anatase) nanocomposites, Spin-coating
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Inglês
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Journal of Sol-Gel Science and Technology, v. 89, n. 1, p. 2-11, 2019.
