中文摘要：

通过溶胶-凝胶法室温制备了掺杂铁二氧化钛纳米晶光催化剂。采用透射电子显微镜、X射线衍射仪、能谱元素分析仪、紫外-可见分光光度计等对所得产物进行表征。以甲基橙为目标降解物,对未掺杂的二氧化钛纳米晶及掺杂铁的二氧化钛纳米晶进行了光催化降解性能研究,并对其降解机理进行了分析。结果表明：适量的铁掺杂有利于提高二氧化钛纳米晶的光催化性能和对甲基橙的降解率。铁的最佳掺杂量为25%[Fe占（Ti＋Fe）的摩尔分数]。掺杂铁的二氧化钛纳米晶光催化性能优于纯二氧化钛纳米晶,在光照150min后,甲基橙的降解率达75%以上。

英文摘要：

Iron-doped titania （TiO2） nanocrystalline grains were prepared by sol-gel method at room temperature.The samples were characterized by using transmission electron microscope,X-ray diffractometer,energy dispersive spectrometry and ultaviolet-visible spectrophotometer.The photocatalytic property of titania nanocrystalline grains and iron-doped titanium dioxide nanocrystalline grains were investigated by degrading the methyl orange solution.The results show that the appropriate content of iron can effectively enhance the photocatalytic activity of TiO2 nanocrystalline grains.The optimized amount of Fe doped is approximately 25% （mole ratio of Fe to （Ti＋Fe））.The photocatalytic property of iron-doped titanium dioxide nanocrystalline grains is better than that of pure titanium dioxide nanocrystalline grains.The degradation rate is more than 75% after a light exposure for 150 min.