Dominguez S, Huebra M, Han C, Campo P, Nadagouda M N, Rivero M J, Ortiz I, Dionysiou D D
Department of Chemical and Biomolecular Engineering, University of Cantabria, 39005, Santander, Spain.
Dpto Química Analítica, Universidad País Vasco, 48080, Bilbao, Spain.
Environ Sci Pollut Res Int. 2017 May;24(14):12589-12598. doi: 10.1007/s11356-016-7564-6. Epub 2016 Sep 27.
A novel magnetically recoverable, visible light active TiO-WO composite (FeO@SiO@TiO-WO) was prepared to enable the photocatalyst recovery after the degradation of bisphenol A (BPA) under simulated solar light. For comparison, the photocatalytic activity of other materials such as non-magnetic TiO-WO, FeO@SiO@TiO, TiO, and the commercial TiO P25 was also evaluated under the studied experimental conditions. The structure and morphology of the synthesized materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), and electron dispersion spectroscopy (EDS). Moreover, Brunauer-Emmett-Teller (BET) surface area and magnetic properties of the samples were determined. The FeO@SiO@TiO-WO and TiO-WO led to a BPA degradation of 17.50 and 27.92 %, respectively, after 2 h of the simulated solar light irradiation. Even though their activity was lower than that of P25, which degraded completely BPA after 1 h, our catalysts were magnetically separable for their further reuse in the treatment. Furthermore, the influence of the water matrix in the photocatalytic activity of the samples was studied in municipal wastewater. Finally, the identification of reaction intermediates was performed and a possible BPA degradation pathway was proposed to provide a better understanding of the degradation process. Graphical abstract ᅟ.
制备了一种新型的可磁回收的可见光活性TiO-WO复合材料（FeO@SiO@TiO-WO），以便在模拟太阳光下降解双酚A（BPA）后实现光催化剂的回收。为作比较，还在研究的实验条件下评估了其他材料如非磁性TiO-WO、FeO@SiO@TiO、TiO以及商用TiO P25的光催化活性。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、高分辨率透射电子显微镜（HR-TEM）和电子能谱（EDS）对合成材料的结构和形貌进行了表征。此外，还测定了样品的比表面积（BET）和磁性。在模拟太阳光照射2小时后，FeO@SiO@TiO-WO和TiO-WO对BPA的降解率分别为17.50%和27.92%。尽管它们的活性低于P25（P25在1小时后能完全降解BPA），但我们的催化剂具有磁性可分离性，可在处理中进一步重复使用。此外，还研究了城市废水中水基质对样品光催化活性的影响。最后，对反应中间体进行了鉴定，并提出了可能的BPA降解途径，以更好地理解降解过程。图形摘要ᅟ。
