Chen Hongyan, Wang Mengke, Huang Weichun
Engineering Training Center, Nantong University, Nantong 226019, China.
School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China.
Nanomaterials (Basel). 2022 Oct 26;12(21):3756. doi: 10.3390/nano12213756.
Photothermally assisted superhydrophobic materials play an important role in a variety of applications, such as oil purification, waste oil collection, and solar desalination, due to their facile fabrication, low-cost, flexibility, and tunable thermal conversion. However, the current widely used superhydrophobic sponges with photothermal properties are usually impaired by a high loading content of photothermal agents (e.g., gold or silver nanoparticles, carbon nanotubes), low photothermal efficiency, and require harmful processes for modification. Here, a one-pot, simple composite consisting of two-dimensional (2D) selenium (Se) nanosheets (NSs) and commercially used melamine sponge (MS) is rationally designed and successfully fabricated by a facile dip-coating method via physical adsorption between 2D Se NSs and MS. The loading content of 2D Se NSs on the skeleton of the MS can be well controlled by dipping cycle. The results demonstrate that after the modification of 2D Se NSs on the MS, the wettability transition from hydrophilicity to hydrophobicity can be easily achieved, even at a very low loading of 2D Se NSs, and the highly stable photothermal conversion of the as-fabricated composites can be realized with a maximum temperature of 111 ± 3.2 °C due to the excellent photothermal effect of 2D Se NSs. It is anticipated that this composite will afford new design strategies for multifunctional porous structures for versatile applications, such as high-performance solar desalination and photothermal sterilization.
光热辅助超疏水材料由于其制备简便、成本低、柔韧性好以及热转换可调等特点，在诸如油净化、废油收集和太阳能海水淡化等各种应用中发挥着重要作用。然而，目前广泛使用的具有光热性能的超疏水海绵通常受到光热剂（如金或银纳米颗粒、碳纳米管）高负载量、低光热效率的影响，并且需要有害的改性工艺。在此，通过二维（2D）硒（Se）纳米片（NSs）与商用三聚氰胺海绵（MS）之间的物理吸附，采用简便的浸涂法合理设计并成功制备了一种由二维硒纳米片和商用三聚氰胺海绵组成的一锅法简单复合材料。通过浸涂循环可以很好地控制二维硒纳米片在三聚氰胺海绵骨架上的负载量。结果表明，在三聚氰胺海绵上修饰二维硒纳米片后，即使在二维硒纳米片负载量非常低的情况下，也能轻松实现从亲水性到疏水性的润湿性转变，并且由于二维硒纳米片优异的光热效应，所制备的复合材料能够实现高度稳定的光热转换，最高温度可达111±3.2℃。预计这种复合材料将为多功能多孔结构提供新的设计策略，用于诸如高性能太阳能海水淡化和光热杀菌等多种应用。
