摘要：

以NH₃·H₂O和Fe（NO₃）₃·9H₂O为原料，采用共沉淀法得到前驱体，分别在150、250、350、450、550℃锻烧前驱体制备了Fe₂O₃，借助拉曼光谱、热重分析仪、X射线衍射、透射电子显微镜和紫外-可见光谱对其进行了表征。通过降解偏二甲肼废水，比较了不同锻烧温度下所得催化剂光催化的活性。结果表明，Fe₂O₃的结晶性和粒径大小同时决定光催化性能，锻烧温度小于450℃时，结晶性起决定作用，锻烧温度大于450℃时，粒径大小起决定作用，450℃锻烧的Fe₂O₃光催化降解偏二甲肼废水的效果最好。

关键词: 共沉淀法, Fe₂O₃, 偏二甲肼废水, 光催化

Abstract:

The precursor has been prepared by coprecipitation process, using NH₃·H₂O and Fe(NO₃)₃·9H₂O as raw materials, and Fe₂O₃ prepared by calcining the precursor at 150, 250, 350, 450, 550℃, respectively.The samples are characterized by Raman spectroscopy, TGA, XRD, TEM and UV-Vis spectrophotometer.The photocatalytic activities of the Fe₂O₃ catalysts obtained at different calcination temperatures are compared through the degradation of unsymmetrical dimethylhydrazine wastewater.The results show that the photocatalytic capacity of Fe₂O₃ is determined by its crystallinity and particle size, synchronously.When calcination temperature is lower than 450℃, crystallinity plays a decisive role, while calcination temperature is higher than 450℃, particle size plays a decisive role.The Fe₂O₃ calcined at 450℃ has the highest photocatalytic degradation effect on unsymmetrical dimethylhydrazine wastewater.

Key words: coprecipitation process, Fe₂O₃, unsymmetrical dimethylhydrazine wastewater, photocatalysis

中图分类号: 

• X703.1