新型纳米锰氧化物的制备及其染料吸附性能

Controlled Preparation of Novel Manganese Oxide Nanocrystals and Dye Adsorption Property

选用Mn（CH3COO）2.4H2O为前体,以十八烯为溶剂,在表面活性剂油酸和油胺存在时,在高温条件下通过＂一锅法＂制得类四角星形状MnO纳米粒子,利用扫描电子显微镜（SEM）和X射线衍射（XRD）等手段对样品的尺寸、形貌及结构进行了表征.结果显示,通过调节表面活性剂的浓度可制得50~100 nm的纳米粒子,并且尺寸可控、粒径均一.该MnO纳米粒子经部分氧化后不仅保持类四角星的形状,且它对亚甲基蓝的吸附性能远优于商用的MnO2.

Novel quadrangle nanoparticles of MnO were one-pot synthesized by the thermal decomposition of Mn（CH3COO）2 4H2O in octadecene at high temperature,using oleic acid and oleyl amine as surfactants.The structure and size of as-prepared products were characterized by scanning electron microscope（SEM） and X-ray powder diffraction（XRD）.The results show that the size of nanoparticles in the range of 50-100 nm with narrow size distribution could be controlled by adjusting the concentrations of the surfactants.The as-prepared MnO nanoparticles were further partially oxidized as MnO2 and the quadrangle structure was inherited by the oxidized.On the other hand,the oxidation process endowed the manganese oxide nanoparticals a good ability to adsorb methylene blue,which is far superior to the adsorption efficiency of commercial MnO2.