稀土铒掺杂TiO_2光催化剂的吸附和光催化活性研究

通过溶胶-凝胶法成功的制备了一系列Er3+掺杂的TiO2光催化剂,并通过XRD、DRS对催化剂进行了表征,结果表明所制催化剂为锐钛矿型,Er3+的掺杂有利于抑制晶粒生长,提高晶体的热稳定性。紫外-可见吸收(DRS)光谱证实,Er3+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,Er3+的掺杂显著提高了橙黄I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,Er3+的掺杂显著提高了TiO2的光催化活性,最佳掺杂量为1.5%。

Adsorption and Photocatalytic Property of Erbium Ion Doping TiO2

A series of erbium ion-doped TiO2(Er3+-TiO2) catalysts were prepared by sol-gel method and characterized by means of XRD and diffusive reflectance spectra(DRS). Results showed that erbium ion doping could inhibit the increase of crystallite size and enhance thermal stability of TiO2. DRS results showed that erbium ion doping TiO2 catalyst had significant absorption between 400nm and 700nm. The adsorption isotherm and degradation of Orange I were investigated in aqueous suspension of pure TiO2 or Er3+-TiO2 catalyst. Results showed that Er3+-TiO2 catalyst had higher adsorption equilibrium constants and better adsorption capacity than pure TiO2. Kinetics of Orange I degradation using different Er3+-TiO2 catalyst were also studied, and results demonstrated that degradation of Orange I under both UV radiation and visible light was more efficient with Er3+-TiO2 catalyst than with pure TiO2, and an optimal dosage of erbium ion at 1.5% achieved the highest degradation rate for Orange I.