摘要
采用溶胶-凝胶法制备了纯TiO2和Eu3+/Sm3+共掺杂TiO2复合粉体,采用XRD,DRS和SEM等技术进行表征,以亚甲基蓝(methylene blue,MB)的光催化降解为目标反应,评价了其光催化活性,探讨了Eu3+/Sm3+共掺杂对TiO2粉体光催化的影响机制。结果表明,Eu3+/Sm3+共掺杂可以显著提高TiO2粉体光催化活性,Eu3+/Sm3+共掺杂在TiO2粉体中产生协同作用,可以抑制TiO2由锐钛矿相向金红石相转变,使TiO2的粒径减小。Eu3+/Sm3+共掺杂增大了TiO2粉体的晶格畸变,使TiO2粉体吸收带边蓝移。当Eu3+/Sm3+的掺杂量分别为0.05%和0.1%,TiO2光催化活性最高,光催化降解率达到84.8%。
Pure TiO2 and Eu3＋ and Sm3＋ co-doped TiO2 composite nano-particle were prepared by sol-gel method and characterized by the techniques such as XRD,DRS and SEM.The photocatalytic degradation of methylene blue（MB） in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity.The mechanisms of effects of Eu3＋ and Sm3＋ co-doped on the photocatalytic activity of the TiO2 composite nano-particles were also discussed.The results show that Eu3＋ and Sm3＋ co-doped can significantly enhance the photocatalytic activity of TiO2 nano-particles.The co-doped of Eu3＋ and Sm3＋ shows a synergistic effect for photocatalytic activity of TiO2 nano-particles,can inhibt the phase transformation from anatase to rutile and decrease the diameter of TiO2 nano-particles.The matrix distortion of TiO2 nano-particles increases when the Eu3＋ and Sm3＋ have co-doped and the blue-shift of the absorption profile are clearly observed.When the co-doped amounts for Eu3＋ and Sm3＋ are 0.05% and 0.1%,the photocatalytic activity of TiO2 can be markedly improved,and its degradation rate reaches 84.8%.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第4期619-623,共5页
Journal of Functional Materials
基金
辽宁省教育厅基金资助项目(2009A622)
关键词
TiO2
光催化
铕和钐共掺杂
协同效应
能量传递
titanium dioxide
photocatalysis
europium ion and samarium ion co-doping
synergistic effect
energy transfer
