采用溶胶-凝胶法制备了Ce、Fe共掺杂的纳米TiO_2光催化剂.以节能灯为光源,考察了催化剂组成、催化剂加入量、反应温度等对其光催化降解亚甲基蓝性能的影响.结果表明:与不掺杂及Ce、Fe单掺杂相比,Ce-Fe共掺杂能明显提高纳米TiO_2在节能灯照射下的光催化活性.其中,Ce_(0.062)5Fe_(0.004)/TiO_2的催化效果最佳,当反应温度50 ℃,反应液pH值5.33,催化剂加入量0.313 g/L 时,4 h的降解率可达96.00%.XRD分析结果显示,催化活性较好的催化剂均为锐钛矿和金红石的混晶,晶粒尺寸在20～30 nm之间.
Ce-Fe co-doped TiO_2 nanopaticles were prepared via Sol-gel process and their decolorization performance of methylene blue under energy saving lamp were investigated. The effects of catalyst composition,catalyst concentration and reaction temperature on their photocatalytic performance were studied. The results indicated that Ce-Fe co-doped TiO_2 showed markedly higher photocatalytic activity than that of TiO_2 and Ce or Fe single doped TiO_2. TiO_2 co-doped with 0.0625% Ce and 0.004% Fe showed the highest photocatalytic efficiency. And using this catalyst when the catalyst concentration was 0.313 g/L,the reaction temperature was 50 ℃ and pH was 5.33 the degradation rate in 4 h could reached 96.00%. XRD characterizing indicated that emulsion of anatase and rutile had better photocatalytic activity and their diameters were between 20 to 30 nm.
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