Lee Jewon, Seong Sicheon, Jin Soyeong, Kim Jaeyong, Jeong Youngdo, Noh Jaegeun
Department of Convergence of Nanoscience, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea.
Department of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea.
Nanomaterials (Basel). 2022 Jul 10;12(14):2361. doi: 10.3390/nano12142361.
Photocatalysis driven by natural sunlight is an attractive approach to removing pollutants from wastewater. Although TiO-based photocatalysts using various support nano-materials with high catalytic activity and reusability have been developed for purifying wastewater, the centrifugal separation methods used for the nanocatalysts limit their use for treating large amounts of water. Here, we prepared a TiO nano-catalyst supported on a halloysite nanotube (HNT)-encapsulated alginate capsule (TiO@HNT/Alcap) to recapture the catalysts rapidly without centrifugation. The structure of TiO@HNT/Alcap was characterized by X-ray diffraction, SEM, and TGA. In our system, the combination of HNTs and alginate capsules (Alcaps) improved the efficiency of adsorption of organic pollutants to TiO, and their milli = meter scale structure allowed ultra-fast filtering using a strainer. The TiO@HNT/Alcaps showed ~1.7 times higher adsorption of rhodamine B compared to empty alginate capsules and also showed ~10 and ~6 times higher degradation rate compared to the HNT/Alcaps and TiO/Alcaps, respectively.
由自然阳光驱动的光催化是一种从废水中去除污染物的有吸引力的方法。尽管已经开发出使用具有高催化活性和可重复使用性的各种载体纳米材料的TiO基光催化剂来净化废水，但用于纳米催化剂的离心分离方法限制了它们在处理大量水方面的应用。在这里，我们制备了一种负载在埃洛石纳米管（HNT）包裹的海藻酸盐胶囊（TiO@HNT/Alcap）上的TiO纳米催化剂，以便在不进行离心的情况下快速回收催化剂。通过X射线衍射、扫描电子显微镜和热重分析对TiO@HNT/Alcap的结构进行了表征。在我们的系统中，HNTs和海藻酸盐胶囊（Alcaps）的结合提高了有机污染物对TiO的吸附效率，并且它们的毫米级结构允许使用滤网进行超快速过滤。与空海藻酸盐胶囊相比，TiO@HNT/Alcaps对罗丹明B的吸附量高出约1.7倍，与HNT/Alcaps和TiO/Alcaps相比，其降解率分别高出约10倍和6倍。
