Photocatalytic degradation of methylene blue using PMMA/TiO2 nanoparticles composites fibers obtained through centrifugal spinning

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In this research work, using the Forcespinning® technique, composites based on poly(methyl methacrylate) with TiO2 nanoparticles (PMMA/NPsTiO2) with different morphologies, spherical (NPs0D) and one-dimensional (NPs1D) were prepared. The compounds obtained were characterized through various analytical techniques, in order to evaluate their physicochemical, thermal, mechanical, surface, and structural properties. Likewise, the photocatalytic efficiency in the degradation of methylene blue (MB) of both composites was evaluated and compared. There were no representative changes in the viscosity of the systems due to the incorporation of the NPsTiO2 resulting in fibers with average diameters without significant variation concerning the reference fibers. The incorporation of NPsTiO2 produced an increase in the thermal stability of the materials, showing a more pronounced effect at a concentration of 3% NPs1D. The higher tensile strength (3.5 ± 1.9 MPa) and Young’s modulus (302.6 ± 152.6 MPa) did not present a significant change in the presence of NPs0D but they decreased with the incorporation of the NPs1D as a consequence of fiber morphology and NPs distribution. MB photocatalytic degradation yield of 28.8% was obtained with the PMMA-based composites with NPs0D (PMMA/NPs0D) and 18.3% with the PMMA-based composite with NPs1D (PMMA/NPs1D), at a concentration of 5% by weight of NPs in both cases, at 4 h of irradiation.

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International Journal of Environmental Science and Technology