掺杂Y^3＋的纳米TiO2微粒的制备及其光催化性能

在Sol-Gel法制备纳米TiO2微粒的最佳制备条件的基础上，制备了掺杂稀土离子钇(Y^3 )的纳米TiO2复合粒子，并对这二者进行了XRD，TEM和DRS表征及光催化活性检验。结果表明，未经掺杂的TiO2与掺杂稀土Y^3 的TiO2均为锐钛和金红石的混合晶型，锐钛和金红石的比例约为3：1；掺杂抑制了TiO2晶粒的生长，使得TiO2粒径明显变小，其颗粒大小为10nm左右。用DRS表征微粒的光吸收能力和光吸收带边移动情况，发现掺杂导致了TiO2光吸收能力增强及吸收带边红移。通过对苯酚的光催化氧化降解研究，发现当Y^3 掺杂量(按质量)为1．5％时，TiO2光催化活性最高，与未掺杂的TiO2相比，其光催化活性提高约20％。

The Preparation of Nanoparticle Y3+-doped TiO2 and Its Photocatalytic Activity

The compound nanoparticle of TiO2 doped with rare earth ions Y3+ was prepared under the optimum condition of preparing nanoparticle TiO2 with sol-gel processing. TiO2 and doped TiO2 were both characterized by XRD, TEM and DRS. The experiments of photocatalytic degradation phenol was used to investigate the activity of Y3+/TiO2 and its effect on the reaction process. The XRD results show that TiO2 and doped TiO2 are the mixture of anatase and rutile, and the ratio of anatase to rutile was 3:1; doping can retard the development of grain size of TiO2 and decrease the diameter of TiO2 to about 10nm. DRS are used to investigate the ability of absorbing light and the shift of spectrums of TiO2 and doped TiO2. The results show doping makes the light absorption increase and the spectrums of 1.5Y3+/TiO2 and 3.0Y3+/TiO2 both show red shift. The results of experiment of photocatalytic degradation of phenol show that the optimum doping content is wt(Y3+)=1.5%, and the photocatalytic degradation ratio of phenol increases by about 20% compared with the undoped TiO2.