Mn掺杂的介孔氧化硅材料的合成与表征

SYNTHESIS AND CHARACTERISTICS OF MANGANESE_ DOPED MESOPOROUS SILICA

在室温碱性条件下合成了Ｍｎ掺杂的介孔氧化硅ＭＣＭ－４１材料，并利用ＸＲＤ，ＦＴＩＲ，Ｎ２吸附，ＨＲＥＭ等测试手段对其进行了表征．研究发现：随着Ｍｎ掺杂量的增加，ＸＲＤ图谱中材料的特征衍射峰（１００）强度逐渐减弱，比表面ＳＢＥＴ值随之减小，表明Ｍｎ掺杂可以使介孔结构稳定性下降；红外光谱中９６８ｃｍ－１附近吸收峰的出现，表明Ｍｎ离子已进入Ｓｉ—Ｏ骨架并引起Ｓｉ—Ｏ—Ｍｎ键的振动；ＨＲＥＭ的结果证实了介孔结构的存在，Ｍｎ的掺杂可造成有序介孔结构发生扭曲并趋向混乱．

Manganese_doped mesoporous silica materials, MCM-41, were synthesized under basic condition at room temperature. The characteristics of MCM-41 samples were investigated using XRD, FTIR, N 2 adsorption, and HREM techniques. It is shown that the (100)peak intensity of XRD patterns weakens and specific surface area of material decreases with addition of Mn ions. FTIR resutls indicate that Mn ions have intered the Si—O framework and lead to vibration of Si—O—Mn bond. It can be seen from HREM images that mesoporous silica framework structure is disordered with the doping of Mn ions.