Eu^3＋掺杂纳米TiO2光催化降解亚甲基蓝的研究

Study on Degradation of MB by Eu^(3+)-doped TiO_2 Nanoparticle

采用溶胶-凝胶法制备了Eu3+掺杂的纳米TiO2粉体。以亚甲基蓝溶液为目标降解物研究了掺杂纳米TiO2粉体的光催化性能,并讨论了掺杂TiO2粉体的加入量、亚甲基蓝溶液的初始浓度、pH值以及稀土元素掺杂量和烧成温度等对样品光催化性能的影响。结果表明:在样品加入量为0.15 g/50 mL,亚甲基蓝溶液的初始浓度为10 mg/L,pH=7时样品的光催化性能最佳。稀土元素的最佳掺杂量(摩尔比)为n(Eu3+)∶n(TiO2)=0.5%,样品的热处理温度在500～550℃时,样品表现出较好的光催化活性。掺杂TiO2粉体对亚甲基蓝有良好的降解效果,反应4 h降解率达到88.16%,优于同等条件下制备的纯TiO2粉体。

Eu3＋-doped nanometer TiO2 powder was synthesized by sol-gel method.The photocatalystic activity was evaluated by photocatalystic degradation of methylene blue.The effects of amount of TiO2 powder,the initial concentration of methylene blue,the pH value,the doping amount of rare-earth and heating temperature on photocatalystic activity of the samples were discussed.The results indicated that photocatalystic activity was the best when the addition amount is 0.15 g/50 mL,the initial concentration is 10 mg/L and the pH value is 7;optimal doping amount（molar ratio） was n（Eu3＋）∶n（TiO2）=0.5%,when heated at 500～ 550 ℃,the photocatalystic properties could be enhanced.The degradation rate has reached to 88.16% after 4 hours＇ reaction.It showed better photocatalystic properties than the undoped TiO2.