采用溶胶-凝胶法制备了 Fe3＋、Gd3＋共掺杂纳米TiO2,并以空心玻璃微珠(HGM)为载体制备了负载型催化剂(Fe3＋/Gd3＋/TiO2-HGM).用 X 射线衍射仪(XRD)、扫描电镜(SEM)和紫外漫反射(DRS)对其进行了表征.考察了溶胶煅烧温度、煅烧时间对空心微珠负载效果的影响,并对负载次数、催化剂用量对亚硝酸盐的光催化活性的影响进行了测定.结果表明,与自制 Fe3＋/Gd3＋/TiO2相比,负载型催化剂可显著提高催化剂的光催化活性；当以500℃下煅烧2 h,负载两次,催化剂投入量为2．0 g/L 时,亚硝酸盐可得到最大降解,其降解率约为93．81％.
The photocatalysts that Fe3+/Gd3+ co-doped nanometre TiO2 supported on hollow glass microspheres (HGM)were synthesized by sol-gel method,and characterized by XRD,TEM techniques and DRS.The effects of the different calcination temperature,calcination time,deposition times,photocatalysts amount and reuse times on the photocatalytic activity were studied.Their photocatalytic activities were tested by degradation of nitrite.The results indicated that hollow glass microspheres coated with TiO2 can significantly enhance the pho-tocatalytic activity of nano-particle.To calcinate 500 ℃ for 2 h,load 2 times and the catalyst inputs for 2.0 g/L, has shown the highest catalytic activity,and the degradation percent of nitrite was about 93.81%.
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