Photocatalytic inhibition of bacteria by TiO2 nanotubes-doped polyethylene composites

• Biocidal catalytic activity studied on PE/TiO2-Ntbs and LLDPE/TiO2-Ntbs composites.
• TiO2-nanotubes doped-PE had a catalytic reduction of 36.7% with no UV after 2 h.
• TiO2-nanotubes-doped LLDPE showed a reduction of 63.5% with no UV after 2 h.
• TiO2-nanotubes doped-PE showed 43.1% of catalytic reduction under UV after 2 h.
• TiO2-nanotubes-doped LLDPE showed 99.9% bacterial reduction under UV after 2 hrs.

Polyethylene (PE) and polyethylene-octadecene (LLDPE) composites containing titanium dioxide nanotubes were synthesized and applied to the inhibition of selected bacteria. It was found that polymerization rate of the polymerizations increased with the incorporation of the octadecene compared with bare ethylene, while with modified nanotubes (O–TiO2–Ntbs) the catalytic activity showed a slight decrease compared with the pure polymer. Regarding physical properties, the melting temperature and cristallinity of PE was higher than LLDPE. LLDPE presented lower rigidity than PE and thus lower Young's modulus. On the other hand, with the incorporation of nanotubes, Young's modulus did not change significantly with respect to PE. After 2 h of contact, the PE/O–TiO2–Ntbs composite showed a reduction of Escherichia coli of 36.7% under no UVA irradiations. In contrast, LLDPE/O–TiO2–Ntbs showed 63.5%. The photocatalytic reduction (under UVA light) was much higher and after 60 min the LLDPE/O-TiO2-Ntbs composites showed a bacterial reduction of 99.9%, whereas the PE/O-TiO2-Ntbs showed 42.6% of catalytic reduction.

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