Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
J Colloid Interface Sci. 2011 Jul 1;359(1):68-74. doi: 10.1016/j.jcis.2011.03.089. Epub 2011 Apr 1.
Magnetic manganese oxide nanostructures are fabricated at room temperature by mixing a KMnO(4) solution and oleic acid capped Fe(3)O(4) particles. Oleic acid molecules capped Fe(3)O(4) particles are oxidized by potassium permanganate (KMnO(4)) in an aqueous solution to produce porous magnetic manganese oxide nanostructures. The synthesis technique can be extended to other MnO(x) structures with composition of different nanocrystals, such as quantum dots, noble metal crystals which may have important applications as catalysts, adsorbents, electrodes and advanced materials in many scientific disciplines. Transmission electron microscopy, energy-dispersive X-ray spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray powder diffraction, Fourier transform infrared spectroscopy, and nitrogen adsorption-desorption measurements are employed to characterize the structures. As an adsorbent in water treatment, the nanostructures possess a large adsorption capability and high organic pollutant removal rates due to the large surface area and pore volume. The nanostructures are recyclable as their adsorption capability can be recovered by combustion. Furthermore, the strong magnetism exhibited by the structures provides an easy and efficient separation means in wastewater treatment under an external magnetic field.
室温下通过混合 KMnO4 溶液和油酸封端的 Fe3O4 颗粒来制备磁性 MnO 纳米结构。油酸封端的 Fe3O4 颗粒在水溶液中被高锰酸钾（KMnO4）氧化，生成多孔磁性 MnO 纳米结构。该合成技术可以扩展到其他具有不同纳米晶体组成的 MnOx 结构，例如量子点、贵金属晶体，它们可能在许多科学领域作为催化剂、吸附剂、电极和先进材料具有重要应用。采用透射电子显微镜、能谱、扫描电子显微镜、X 射线光电子能谱、X 射线粉末衍射、傅里叶变换红外光谱和氮气吸附-脱附测量来对结构进行表征。作为水处理中的吸附剂，由于具有较大的比表面积和孔体积，该纳米结构具有较大的吸附能力和较高的有机污染物去除率。通过燃烧可以回收纳米结构的吸附能力，因此其具有可回收性。此外，结构中表现出的强磁性在外磁场下为废水处理提供了一种简便、高效的分离手段。
