Eu2O3修饰对纳米TiO2热稳定性及光催化活性的影响  

Effects of Modification with Eu_2O_3 on the Thermal Stability and Photocatalytic Activity of Nanosized TiO_2

作　　者：屈宜春[1] 井立强[1] 林景升[1] 付宏刚[1] 

机构地区：[1]黑龙江大学化学化工与材料学院物理化学实验室,黑龙江哈尔滨150080

出　　处：《分子催化》2009年第4期357-361,共5页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金(No20501007);教育部新世纪优秀人才支持计划(NCET-070259);教育部科学技术研究重点项目(No207027);黑龙江省杰出青年科学基金(JC200701);黑龙江省教育厅科学技术研究项目(No11511283)

摘　　要：通过浸渍过程实现了Eu2O3对溶胶水热法合成的锐钛矿相TiO2纳米粒子的表面修饰改性.重点研究了表面修饰对纳米锐钛矿相热稳定性及光催化活性的影响.结果表明,Eu2O3表面修饰抑制了锐钛矿相向金红石相的转变,相变温度由550℃左右升高到700℃左右,提高了纳米锐钛矿相TiO2的热稳定性,这与Eu2O3修饰在表面而阻碍了锐钛矿纳米粒子的直接接触有关.与未修饰的TiO2相比,经过700℃高温热处理的Eu2O3修饰的TiO2样品表现出了较高的光催化活性,这与其结晶度提高而有利于光生电荷分离有关.completed activity of Eu2O3 surface modification of anatase TiOznanoparticles synthesized by a sol-thermal process has been through an impregnation process. The effects of modification on the thermal stability of anatase and the photocatalysis were mainly investigated. The results showed the phase transformation temperature increased from near 550 ℃ to about 700 ℃. The and enhanced the thermal stability of nanosized anatase particles from contacting directly. with Eu2O3 by thermal treatment at 700 ℃ uted to the enhancing of crystallinity so as modification retarded the phase transformation from anatase to rutile anatase TiO2. since Eu2O3 modified on TiOz surface to prevent the During the processes of photocatalytic degradation RhB, TiO2 modified exhibited high activity compared to promote photoinduced charge with un-modified TiO2, which is attributed to the enhancing of crystallinity so as to promote photoinduced charge separation.

关 键 词：TIO2 纳米粒子 锐钛矿热稳定性 氧化铕表面修饰 光催化 

分 类 号：O643.32[理学—物理化学]