电子束辐射技术制备纳米氧化铁  

Preparation of Nanocrystalline α- Fe_2O_3 by Radiation Technique

作　　者：李珍[1] 吴明红[1] 顾建忠[1] 焦正[1] 吕森林[1] 王德庆[1] 

机构地区：[1]上海大学环境与化学工程学院射线所,上海201800

出　　处：《高校化学工程学报》2006年第3期481-484,共4页Journal of Chemical Engineering of Chinese Universities

基　　金：上海市教育委员会(04AB42);上海市启明星基金(05QMX1423);上海市重点学科(T0105)。

摘　　要：以2MeV 10mA GJ-2-Ⅱ电子加速器作为放射源,采用新型电子束辐射技术来制备纳米氧化铁材料.该制备是在常温常压下进行且不需要任何催化剂.通过实验发现,溶液pH为6.54,辐照剂量达到300 kGy为最佳的实验条件.通过X射线衍射（XRD）,透射电子显微镜（TEM）和红外光谱（FTIR）分析了α-Fe2O3的结构、形貌及其粒径.X射线衍射谱表明辐射法制备的α-Fe2O3纳米颗粒具有六面体结构,结合Scherer公式近似计算出颗粒的晶粒径为30～60 nm.从TEM照片可以看出,辐射法制备的纳米氧化铁颗粒形状为球形,分散均匀,平均粒径为30～60 nm.FTIR谱图显示辐射法制备的粉末出现了两个谱带V1和V2,两个谱带相应的波数为536.57和460.09 cm^-1.这正是属于α-Fe2O3的特征吸收.实验结果说明电子束辐射技术是一种制备纳米氧化铁的有效的方法.A new electron beam radiation method was developed to prepare nanocrystalline iron oxide （Ⅲ）. The 2 MeV 10 mA GJ-2-11 electronic accelerator was used as the radiation source. The nanocrystalline iron oxide （Ⅲ） was prepared at room temperature and ambient pressure, without using any kinds of catalysts. The experiments show that the optimal conditions of preparation are the pH value of the solution 6.54 and the radiation dose used 300 kGy. The structure, morphology and size of the nano-particles prepared were characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM） and Fourier transform infrared spectrometry （FTIR）. The XRD pattern shows that the α-Fe2O3 particles prepared by radiation method have hexagonal structures, and according to Scherrer＇s equation, the average diameter of the prepared particles is around 30-60 nm. The TEM photos show that the iron oxide （Ⅲ） particles prepared by radiation method have spherical shape morphology and good dispersity. The mean particle size determined from the TEM photograph is also in the rang of 30-60 nm. The FTIR spectrum confirms that the powders prepared by radiation method are α-Fe2O3. The results mentioned above indicate that the electron beam radiation technique is an effective method for preparing nanocrystalline iron oxide （Ⅲ）.

关 键 词：辐射技术 纳米材料 氧化铁 电子束 

分 类 号：TQ138.11[化学工程—无机化工] TB383[一般工业技术—材料科学与工程]