School of Chemical Engineering, Zhengzhou University, China.
Water Sci Technol. 2012;65(6):1054-9. doi: 10.2166/wst.2012.925.
Hierarchical MnO₂ nanostructures were prepared through the reaction between KMnO₄ and oleic acid at room temperature in the surfactant-free microemulsion system. The obtained samples were characterized by powder X-ray diffraction, N₂ adsorption, scanning electron microscopy, and transmission electron microscopy. The results indicated that the flowerlike nanospheres were three-dimensional (3D) porous microstructures consisting of nanoplates. The surface area of the sample was 171.5 m(2)/g and the distribution of pore diameter lay within the range of 5-15 nm. The prepared hierarchically structured MnO₂ showed excellent adsorption capacity and rapid adsorption rate for methylene blue ions in water. The maximum adsorption capacity of methylene blue was as high as 273.9 mg/g and 97.5% of the dye was removed within initial 5 min of contact time. Compared with other adsorbents, the synthesized hierarchical MnO₂ nanostructures displayed a faster adsorption rate and higher adsorption capacity, which implied potential application for removing dye pollutants from waste water.
通过在无表面活性剂的微乳液体系中，室温下 KMnO₄ 与油酸之间的反应，制备了分层 MnO₂ 纳米结构。通过粉末 X 射线衍射、N₂吸附、扫描电子显微镜和透射电子显微镜对所得样品进行了表征。结果表明，花状纳米球是由纳米板组成的三维（3D）多孔微结构。该样品的比表面积为 171.5 m(2)/g，孔径分布范围为 5-15nm。所制备的分层结构 MnO₂ 对水中亚甲基蓝离子表现出优异的吸附容量和快速吸附速率。亚甲基蓝的最大吸附容量高达 273.9mg/g，在接触时间最初的 5 分钟内，染料的去除率达到了 97.5%。与其他吸附剂相比，合成的分层 MnO₂ 纳米结构具有更快的吸附速率和更高的吸附容量，这意味着其在去除废水中的染料污染物方面具有潜在的应用。
