【摘要】 用溶胶 -凝胶法制备了掺杂 Eu3+ 的纳米 Ti O2 ,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 Ti O2 晶格中引起了 Ti O2 晶格膨胀 ,导致晶格畸变增大 ,抑制了 Ti O2 晶相的转变和粒径的增长 .结果表明 ,Eu3+ 掺杂可提高 Ti O2 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 .更多还原

【Abstract】 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.更多还原