球形Mn_2O_3晶体的制备及其光催化性能

Preparation and Photocatalytic Activity of Mn_2O_3 Microspheres

在乙二醇体系中,以MnCl2.4H2O和NaAc为主要原料溶剂热制备锰氧前驱物.该前驱物经600℃煅烧5h得到球形Mn2O3晶体.利用X射线粉末衍射(XRD)、透射电子显微镜(TEM)和扫描电子显微镜(SEM)等手段对产物进行了表征,对其形成机理进行了初步的分析,并对其光催化性能进行了初步探讨.实验结果表明,产物为球形Mn2O3晶体,其平均直径约为7μm,且由多层纳米片组成,而纳米片则是由细小的纳米颗粒构成.产物Mn2O3晶体的特殊形貌结构对光催化H2O2氧化分解亚甲基蓝有较好的催化性能.

Mn2O3 microspheres were synthesized by a two-step method in ethylene glycol（EG） system.First,the precursor was produced in the presence of ethylene glycol（EG） by using MnCl2·4H2O and sodium acetate（NaAc） as reactants.Second,the precursor was calcined to obtain the products of crystalline Mn2O3.The products were characterized by powder X-ray diffraction（XRD）,transmission electron microscope（TEM） and scanning electron microscope（SEM）.Moreover,the photocatalytic activity of the products was examined by measuring the photodegradation of methylene blue solution with ultraviolet radiation in the presence of H2O2.The results show that the as-synthesized Mn2O3 microspheres assembled by nanoslices,which is composed of large quantity of nanoparticles.And the average diameters of the Mn2O3 microspheres are 7km.The formation mechanism of the Mn2O3 microspheres is simply discussed.And the Mn2O3 microspheres have good photocatalytic activity due to its particular structure.