Boaretti Carlo, Roso Martina, Modesti Michele, Lorenzetti Alessandra
Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
Nanomaterials (Basel). 2023 Jan 20;13(3):435. doi: 10.3390/nano13030435.
The present work investigates the effect of ultrasounds in the performance of combined advanced oxidation processes (AOPs) on the degradation of formaldehyde (HCHO)-polluted aqueous solutions for potential application in wastewater treatment. Different heterogeneous nanostructured catalysts based on TiO and FeSO for photocatalysis and the Fenton process were employed after electrospray deposition on electrospun nanofibrous membranes. Such systems were tested, without the use of any added hydrogen peroxide, by varying the combinations among the selected AOPs in a batch reactor configuration. The results show that, in the absence of a Fenton reaction, ultrasounds provided a significantly increased formaldehyde photocatalytic abatement, probably by increasing the concentration of active species through a different set of reactions while providing a favorable mass transfer regime by the cavitational effect. Due to the faster kinetics of the photo-Fenton process, thanks to its partial homogeneous nature, such a beneficial effect is more limited for the sono-photo-Fenton configuration. On the other hand, the employment of a sono-photocatalytic-Fenton process revealed a synergic effect that provided the best results, reducing the formaldehyde concentration to less than 99% after 240 min. Further analysis showed that, due to a mutual influence, only a tailored TiO/FeSO ratio on the membranes was able to display the best performance.
本研究探讨了超声波在组合高级氧化工艺（AOPs）处理甲醛（HCHO）污染水溶液中的作用，以期应用于废水处理。基于TiO和FeSO的不同非均相纳米结构催化剂用于光催化和芬顿工艺，通过电喷雾沉积在电纺纳米纤维膜上。在间歇式反应器配置中，通过改变所选AOPs之间的组合，在不添加任何过氧化氢的情况下对这些系统进行了测试。结果表明，在没有芬顿反应的情况下，超声波显著提高了甲醛的光催化去除率，这可能是通过不同的反应集增加了活性物种的浓度，同时通过空化效应提供了有利的传质机制。由于光芬顿过程的动力学较快，得益于其部分均相的性质，这种有益效果在声-光芬顿配置中更为有限。另一方面，采用声-光催化-芬顿工艺显示出协同效应，取得了最佳效果，240分钟后甲醛浓度降低至99%以下。进一步分析表明，由于相互影响，只有膜上特定的TiO/FeSO比例才能表现出最佳性能。
