"Petru Poni" Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487, Iasi, Romania.
"Petru Poni" Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487, Iasi, Romania.
J Environ Manage. 2022 Aug 15;316:115317. doi: 10.1016/j.jenvman.2022.115317. Epub 2022 May 20.
Titanium dioxide (TiO)-based nanofibers doped with samarium (Sm) and erbium (Er) at doping levels tuned in the range of 0.05-1.0% were prepared by the electrospinning-calcination method. The produced materials were well characterized by X-ray diffraction, SEM, EDX, and UV-vis diffuse reflectance spectroscopy. These one-dimensional nanostructures showed a crystalline structure with values of fiber diameters values between 60 and 100 nm. The best catalyst sample of this study was formulated as TiO:Sm (0.1%) and sintered at 600 °C. And, it was employed to intensify the photocatalytic process under visible-light irradiation. Likewise, the chemometric approach was applied to optimize the process. The results revealed that the rate constant for the photo-degradation of a cationic organic pollutant was significantly improved (k = 3.496 × 10 min). In terms of the reaction half-life, the intensification and optimization of the process led to a decrease in the half-life of the reaction from 68 to 2 min. And, these are outstanding findings for the photo-degradation process under visible-light irradiation. In addition, the total organic carbon (TOC) removal efficiencies were found to be 69.95% and 72.30% for the mineralization of MB and CIP, respectively, after a 360 min reaction time, which are significant results. Moreover, this material demonstrated remarkable photocatalytic activity for the degradation of ciprofloxacin (CIP) with a 99.6% removal efficiency and a rate constant of 4.292 × 10 min. Finally, the stability and reusability of this catalyst were demonstrated during five repetitive cycles of the CIP photodegradation.
掺钐（Sm）和铒（Er）的二氧化钛（TiO）基纳米纤维，掺杂浓度在 0.05-1.0%范围内可调，采用静电纺丝-煅烧法制备。通过 X 射线衍射、SEM、EDX 和紫外可见漫反射光谱对所制备的材料进行了很好的表征。这些一维纳米结构具有结晶结构，纤维直径值在 60-100nm 之间。本研究中最佳的催化剂样品为 TiO:Sm（0.1%），在 600°C 下烧结。并将其用于在可见光照射下强化光催化过程。同样，应用化学计量学方法来优化该过程。结果表明，阳离子有机污染物的光降解速率常数显著提高（k=3.496×10 min）。从反应半衰期来看，该过程的强化和优化导致反应半衰期从 68 分钟缩短到 2 分钟。这些在可见光照射下的光降解过程中是出色的发现。此外，在 360 分钟的反应时间后，MB 和 CIP 的总有机碳（TOC）去除效率分别达到 69.95%和 72.30%，这是显著的结果。此外，该材料在降解环丙沙星（CIP）的光催化活性方面表现出优异的性能，去除效率达到 99.6%，速率常数为 4.292×10 min。最后，在 CIP 光降解的五个重复循环中证明了该催化剂的稳定性和可重复使用性。
