Environment Functional Materials Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences , Shenyang 110016, P. R. China.
Zhangjiagang Green Tech Environmental Protection Equipment Co., LTD. , Zhangjiagang 215625, P. R. China.
ACS Appl Mater Interfaces. 2015 Dec 2;7(47):26291-300. doi: 10.1021/acsami.5b08862. Epub 2015 Nov 19.
One-dimensional nanomaterials may organize into macrostructures to have hierarchically porous structures, which could not only be easily adopted into various water treatment apparatus to solve the separation issue of nanomaterials from water but also take full advantage of their nanosize effect for enhanced water treatment performance. In this work, a novel template-based process was developed to create Mn3O4/CeO2 hybrid nanotubes, in which a redox reaction happened between the OMS-2 nanowire template and Ce(NO3)3 to create hybrid nanotubes without the template removal process. Both the Ce/Mn ratio and the precipitation agent were found to be critical in the formation of Mn3O4/CeO2 hybrid nanotubes. Because of their relatively large specific surface area, porous structure, high pore volume, and proper surface properties, these Mn3O4/CeO2 hybrid nanotubes demonstrated good As(III) removal performances in water. These Mn3O4/CeO2 hybrid nanotubes could form paper-like, free-standing membranes spontaneously by a self-assembly process without high temperature treatment, which kept the preferable properties of Mn3O4/CeO2 hybrid nanotubes while avoiding the potential nanomaterial dispersion problem. Thus, they could be readily utilized in commonly used flow-through reactors for water treatment purposes. This approach could be further applied to other material systems to create various hybrid nanotubes for a broad range of technical applications.
一维纳米材料可以组装成具有分级多孔结构的宏观结构，不仅可以很容易地被应用于各种水处理设备中，以解决纳米材料与水分离的问题，还可以充分利用其纳米尺寸效应，提高水处理性能。在这项工作中，开发了一种新的基于模板的工艺来制备 Mn3O4/CeO2 混合纳米管，其中 OMS-2 纳米线模板与 Ce(NO3)3 之间发生氧化还原反应，在没有模板去除过程的情况下形成混合纳米管。Ce/Mn 比和沉淀剂都被发现对 Mn3O4/CeO2 混合纳米管的形成至关重要。由于其具有较大的比表面积、多孔结构、高孔体积和适当的表面性质，这些 Mn3O4/CeO2 混合纳米管在水中对 As(III)具有良好的去除性能。这些 Mn3O4/CeO2 混合纳米管可以通过自组装过程自发形成纸状的、独立的膜，而无需高温处理，这保持了 Mn3O4/CeO2 混合纳米管的优异性能，同时避免了潜在的纳米材料分散问题。因此，它们可以很容易地应用于常用的水处理流动反应器中。这种方法可以进一步应用于其他材料体系，以创建各种用于广泛技术应用的混合纳米管。
