论文部分内容阅读
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.
The effect of surface modification on the thermal stability and photocatalytic activity of nano-anatase phase was studied by the impregnation process of Eu2O3 on the surface modification of anatase TiO2 nanoparticles synthesized by hydrothermal sol-gel method. The results showed that, The surface modification of Eu2O3 inhibits the transformation from anatase phase to rutile phase, and the phase transition temperature increases from about 550 ℃ to about 700 ℃, which improves the thermal stability of nanometer anatase phase TiO2, which is hindered by Eu2O3 modification on the surface Anatase nanoparticles.Compared with unmodified TiO2, Eu2O3-modified TiO2 samples which have been heat-treated at 700 ℃ for higher photocatalytic activity show higher photocatalytic activity than that of unmodified TiO2, which is in favor of photoexcited charge separation related.