Abstract:

A series of praseodymium ion doped TiO₂(Pr³⁺-TiO₂) catalysts have been prepared successfully by the sol-gel method and characterized by means of XRD and diffusive reflectance spectra (DRS). The results show that the catalysts prepared are anatase titanium dioxide typed. The XRD results show that the doping of praseodymiumions is good for inhibiting the growth of the crystallite grains and enhance the thermal stability of crystal，and the DRS results show that the doping of praseodymium ions has significant absorption capacity in visible region between 400 nm and 800 nm. The adsorption tests show that the doping of praseodymium ions increases the adsorption capacity of Reactive Yellow KE-4RN on the surface of TiO₂ catalysts remarkably. With the increase of doping dosage of Pr³⁺ the adsorption capability increases. The activity test results show that the doping of Pr³⁺ improves the photocatalytic activity significantly. The best doping mass fraction of Pr³⁺ is 1.5%.

Key words: praseodymium ions, TiO₂, dyestuff, adsorption, photo-catalytic degradation

摘要：

通过溶胶-凝胶法成功地制备了一系列Pr³⁺掺杂的TiO₂光催化剂,并通过X射线衍射(XRD)、紫外-可见吸收(DRS)对催化剂进行了表征,结果表明所制催化剂为锐钛矿型,Pr³⁺的掺杂有利于抑制晶粒生长,提高晶体的热稳定性。DRS光谱证实,Pr³⁺的掺杂增强了催化剂在可见光区域的吸收能力。吸附实验结果表明,Pr³⁺的掺杂显著提高了活性黄KE-4RN在TiO₂催化剂表面的吸附能力,随掺杂量增加,吸附增强。活性实验结果表明,Pr³⁺的掺杂显著提高了TiO₂的光催化活性,最佳掺杂质量分数为1.5%。

关键词: 镨离子, 二氧化钛, 染料, 吸附, 光催化降解

CLC Number: 

• X174