Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran.
Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran.
J Colloid Interface Sci. 2018 Aug 15;524:325-336. doi: 10.1016/j.jcis.2018.03.069. Epub 2018 Apr 6.
Herein, novel magnetic TiO/FeO/CoWO nanocomposites were fabricated using a simple refluxing method followed by a calcination step at 450 °C. Photocatalytic activity of these nanocomposites were studied by decomposing rhodamine B, methyl orange, and fuchsine dye contaminants under visible-light illumination. Among the fabricated photocatalysts, the TiO/FeO/CoWO (30%) photocatalyst exhibited superior activity. The degradation rate constant for rhodamine B by this ternary nanocomposite was 8.5 and 5.6 folds greater than those of the pure TiO and TiO/FeO photocatalysts, respectively. Trapping experiments showed that superoxide anion radicals played critical role during the photocatalytic process. Visible-light harvesting due to the presence of CoWO and effective suppression of the charge carriers from recombination due to formation of p-n heterojunction are the major parameters affecting the photocatalytic activity. Furthermore, the TiO/FeO/CoWO (30%) photocatalyst displayed highly stable recycling performances. The present study provides a new strategy to design and fabricate magnetically recoverable photocatalysts based on TiO with considerable activity under visible-light.
本文采用简单的回流法制备了新型磁性 TiO/FeO/CoWO 纳米复合材料，然后在 450°C 下进行煅烧。通过在可见光照射下分解罗丹明 B、甲基橙和碱性品红染料污染物来研究这些纳米复合材料的光催化活性。在制备的光催化剂中，TiO/FeO/CoWO（30%）光催化剂表现出优异的活性。该三元纳米复合材料对罗丹明 B 的降解速率常数分别是纯 TiO 和 TiO/FeO 光催化剂的 8.5 倍和 5.6 倍。捕获实验表明，超氧阴离子自由基在光催化过程中起关键作用。由于 CoWO 的存在而实现的可见光捕获以及由于形成 p-n 异质结而有效抑制载流子复合是影响光催化活性的主要因素。此外，TiO/FeO/CoWO（30%）光催化剂表现出高度稳定的可回收性能。本研究为设计和制备具有可见光下相当活性的基于 TiO 的可磁回收光催化剂提供了一种新策略。
