铕掺杂对纳米TiO2的光催化活性的影响

用溶胶-凝胶法制备了掺杂Eu3+的纳米TiO2,用XRD和TG-DTA对其进行了表征,并以正庚烷为气相有机污染物的实例研究了样品的光催化活性,发现Eu3+进入TiO2晶格中引起了TiO2晶格膨胀,导致晶格畸变增大,抑制了TiO2晶相的转变和粒径的增长.结果表明,Eu3+掺杂可提高TiO2的光催化活性,并且当掺杂摩尔分数为0.3%时,光催化活性最好.随着焙烧温度的升高,光催化活性下降,而利用较高的水解酸度则有利于得到光催化活性较高的样品.

Effect of Eu3+ Doping on the Photocatalytic Activity of Nanoparticles TiO2

The photocatalytic activities of Eu 3+-doped TiO 2 nanoparticles prepared by sol-gel method and characterized with XRD and TG-DTA were stidied via photocatalytic oxidation of n-heptane. The enhanced photocatalytic activity of Eu 3+-doped TiO 2 can be attributed to the fact that Eu 3+ ions enter into the lattice of TiO 2 to lead to the lattice expansion, enhancing the distortion of lattice, and inhibiting the crystal phase transformation and the increase of grain size. It is found that the x(Eu 3+)= 0.3% was optimal, and the photocatalytic activity of Eu 3+-doped TiO 2 decreased with increasing the calcination temperature, and the higher the pH, the greater the photocatalytic activity.