Department for Nanostructured Materials, Jožef Stefan Institute , Jamova 39, SI-1000 Ljubljana, Slovenia.
ACS Appl Mater Interfaces. 2013 Sep 25;5(18):9088-94. doi: 10.1021/am402389t. Epub 2013 Sep 5.
A photocatalytic, TiO2-based microreactor is designed and fabricated on a metal-titanium foil. The microchannel is mechanically engraved in the substrate foil, and a double-layered TiO2 anatase film is immobilized on its inner walls with a two-step synthesis, which included anodization and a hydrothermal treatment. X-ray diffraction (XRD) and scanning electron microscopy (SEM) confirm the presence of an approximately 10-μm-thick layer of titania nanotubes and anatase nanoparticles. The SEM and transmission electron microscopy (TEM) of the cross sections show a dense interface between the titanium substrate and the TiO2 nanotubes. An additional layer of TiO2-anatase nanoparticles on the top of the film provides a large, photocatalytic surface area. The metal-titanium substrate with a functionalized serpentine channel is sealed with UV-transparent Plexiglas, and four 0.8-mW UV LEDs combined with a power controller on a small printed-circuit board are fixed over the substrate. The photocatalytic activity and the kinetic properties for the degradation of caffeine are provided, and the longer-term stability of the TiO2 film is evaluated. The results show that after 6 months of use and 3600 working cycles the microreactor still exhibits 60% of its initial efficiency.
设计并制作了一种基于 TiO2 的光催化微反应器，其构建在金属钛箔上。微通道通过机械方式在基底箔上刻蚀而成，并通过两步合成将双层锐钛矿 TiO2 薄膜固定在其内壁上，两步合成包括阳极氧化和水热处理。X 射线衍射（XRD）和扫描电子显微镜（SEM）证实存在约 10μm 厚的 TiO2 纳米管和锐钛矿纳米颗粒层。SEM 和横截面的透射电子显微镜（TEM）显示，钛基底和 TiO2 纳米管之间存在致密的界面。薄膜顶部的 TiO2-锐钛矿纳米颗粒层提供了较大的光催化表面积。功能化蛇形通道的金属钛基底用透明 UV 聚碳酸酯密封，并在小印刷电路板上固定了四个 0.8mW 的 UV LED 以及一个功率控制器。提供了光催化活性和咖啡因降解的动力学特性，并评估了 TiO2 薄膜的长期稳定性。结果表明，经过 6 个月的使用和 3600 个工作循环后，微反应器仍保持初始效率的 60%。
