锻烧温度对Fe_2O_3光催化降解偏二甲肼废水的影响

Influences of calcination temperature on Fe_2O_3 photocatalytic degradation of unsymmetrical dimethylhydrazine wastewater

以NH_3·H_2O and Fe(NO_3)_3·9H_2O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Fe_2O_3,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,Fe_2O_3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Fe_2O_3光催化降解偏二甲肼废水的效果最好。

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.