Institute of Nanotechnology (Nanotec), National Research Council (CNR), c/o Department of Chemistry, University of Bari "Aldo Moro", Via Orabona 4, 70126 Bari, Italy.
Department of Chemistry and Chemical Technologies, University of Calabria, Via P. Bucci, Cubo 15D, 87036 Arcavacata di Rende (Cs), Italy.
Photochem Photobiol Sci. 2019 Sep 1;18(9):2248-2258. doi: 10.1039/c9pp00050j. Epub 2019 May 2.
Fabrics obtained from cellulose spinning, extracted from Spanish broom, were coated with TiO film, through the low pressure plasma sputtering technique, in order to get antibacterial activity. The obtained fabrics were used for the photocatalytic degradation of Escherichia coli, by irradiation with UV-light emitting diodes (UV-LED), in a batch photocatalytic reactor. Before and after functionalization treatments, cellulosic substrates were chemically characterized by X-ray photoelectron spectroscopy (XPS) analyses. Water Contact Angle (WCA) measurements allowed obtaining information about the hydrophilicity of the materials, while their antibacterial efficiency was determined at several initial concentrations (from 10 up to 10 CFU mL) of bacteria in distilled water, bottled water and synthetic wastewater. It was found that photocatalytic reactions were capable of achieving up to 100% bacterial inactivation in 1 h of treatment, following a pseudo-first order kinetic model. No bacterial regrowth was observed after photocatalytic treatments in almost all experimental conditions. In contrast, during photolytic treatment (i.e. in the absence of the TiO coated fabrics) bacteria recovered their initial concentration after 3 h in the dark. Finally, the reusability of the plasma modified fibers to inactivate bacteria was studied.
从西班牙金雀枝中提取的纤维素纺丝纤维，通过低压等离子体溅射技术涂覆 TiO 薄膜，以获得抗菌活性。将得到的纤维用于在批量光催化反应器中用紫外发光二极管（UV-LED）照射进行大肠杆菌的光催化降解。在功能化处理前后，通过 X 射线光电子能谱（XPS）分析对纤维素基质进行了化学表征。水接触角（WCA）测量可提供有关材料亲水性的信息，而其抗菌效率则在蒸馏水中、瓶装水中和合成废水中的初始细菌浓度（从 10 到 10 CFU mL）进行了测定。结果发现，在 1 h 的处理时间内，光催化反应能够达到 100%的细菌失活，遵循拟一级动力学模型。在几乎所有的实验条件下，光催化处理后都没有观察到细菌再生。相比之下，在光解处理（即在没有涂覆 TiO 的纤维的情况下）中，细菌在黑暗中 3 小时后恢复到初始浓度。最后，研究了等离子体改性纤维灭活细菌的可重复使用性。
