Zr和S共掺杂TiO_2光催化剂的制备及性能

Preparation of TiO_2 Photocatalyst Co-Doped with Zr and S

用固相浸渍法制备了Zr和S共掺杂TiO2(Zr-S-TiO2)光催化剂,用X射线衍射、傅里叶变换红外光谱和紫外-可见光漫反射等手段对Zr-S-TiO2光催化剂进行了表征。以可见光光解水制氢为探针反应,考察了Zr-S-TiO2光催化剂的活性。实验结果表明,Zr和S共掺杂提高了TiO2对可见光(波长大于420nm)的吸收,减小了TiO2的平均粒径,使TiO2晶格畸变应力增大,促进了光生电子-空穴对的分离,从而提高了TiO2催化可见光光解水制氢反应的活性。当n(S)∶n(Ti)=6∶1、煅烧温度500℃、Zr掺杂量(质量分数)为0.75%时,Zr-S-TiO2光催化剂制氢的活性最高。

A visible-light TiO2 photocatalyst co-doped with Zr and S （Zr-S-TiO2 ）was prepared by impregnation method. The catalyst was characterized by means of XRD, FTIR and UV-Vis diffuse reflection spectroscopy. The activity of Zr-S-TiO2 photocatalyst under visible light irradiation was evaluated by photodecomposition of water for hydrogen production. Doping of Zr and S increases visible-light （A 〉 420 nm） absorption of the catalyst, reduces average size of TiO2 crystallites, enhances desired lattice distortion of TiO2, promotes separation of photo-induced electron-hole pair, and thus improves hydrogen production under visible light irradiation. Under conditions of calcination temperature 500 ℃, n （S） ： n（Ti） 6 ： 1 and Zr doping amount （mass fraction） 0.75%, activity of the Zr-S-TiO2 photocatalyst in hydrogen production is the highest.