Laboratório de Materiais Híbridos, Departamento de Química, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo - Campus Diadema, Brazil.
Institut de Science des Matériaux de Mulhouse CNRS UMR 7361, Université de Haute-Alsace, Université de Strasbourg, 3b rue Alfred Werner, 68093 Mulhouse, Cedex, France.
Carbohydr Polym. 2020 Feb 15;230:115621. doi: 10.1016/j.carbpol.2019.115621. Epub 2019 Nov 13.
In this study, we report the production of a free-standing film of non-modified cellulose impregnated with 12 wt.% of MnO nanoparticles with less than 100 nm in size. The method here described can be applied to the immobilization of different types of nanoparticles. The film was prepared by dissolving microcrystalline cellulose in an ionic liquid followed by its regeneration by adding water to the former solution. Then, the wet film was impregnated with the nanoparticles by dipping it in a MnO dispersion. Electron microscopy images revealed manganese dioxide nanoparticles distributed not only at the film surface but also in its interior. The cellulose film impregnated with MnO nanoparticles was capable of efficiently discolouring an Indigo Carmine dye solution in 25 min upon ambient light. The film was easily removed from the dye solution and repeatedly reused for at least 10 times without losing its discolouring efficiency.
在这项研究中，我们报告了一种由未经修饰的纤维素制成的、可独立成膜的材料的制备，其中纤维素浸渍有 12wt%的、粒径小于 100nm 的 MnO 纳米颗粒。这里所描述的方法可以应用于不同类型纳米颗粒的固定化。该薄膜是通过将微晶纤维素溶解在离子液体中，然后再向该溶液中加水使其再生而制备的。然后，通过将湿膜浸入 MnO 分散体中来浸渍纳米颗粒。电子显微镜图像显示，二氧化锰纳米颗粒不仅分布在薄膜表面，而且分布在其内部。MnO 纳米颗粒浸渍的纤维素薄膜在环境光下能够在 25 分钟内高效地使靛蓝胭脂红染料溶液褪色。薄膜很容易从染料溶液中取出，并可至少重复使用 10 次而不丧失其褪色效率。
