Bacterial cellulose–SiO2@TiO2 organic–inorganic hybrid membranes with self-cleaning properties
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This work reports the preparation of bacterial cellulose (BC) membranes with self-cleaning properties. SiO2@TiO2 (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.
Development 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.
KeywordsFunctional bacterial cellulose membrane SiO2@TiO2 (anatase) nanocomposites Photocatalytic activity Self-cleaning properties Dip-coating Spin-coating
This work has been financially supported by Fundação de Amparo à pesquisa do estado de São Paulo (FAPESP), through project 2015/12908-2. ASM is thankful to FAPESP for a grant. The authors thank André Tobello Foundation for effering the strain Gluconacetobacter xylinum (ATCC23760) LNNano-CNPEM (Campinas, Brazil) for the use of the JEOL-JEM 2100 F STEM microscope and Dr. Sajjad Ullah for help in XRFA measurements.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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