稀土掺杂纳米TiO_2光催化剂制备及其光催化性能

Preparation and photocatalytic activity of nano-TiO_2 photocatalyst doped with rare-earth elements

采用溶胶-微波法制备掺杂不同稀土元素纳米TiO_2光催化剂,借助XRD和UV-Vis吸收光谱等手段对其进行表征。以甲基橙为模拟污染物,考察样品的光催化性能。结果表明,适量的La^(3+)、Nd^(3+)、Eu^(3+)、Gd^(3+)和Y^(3+)掺杂可提高TiO_2样品的光催化活性,最佳掺杂物质的量分数分别为0.1%、0.1%、0.3%、0.2%和0.1%。在所有共掺杂TiO_2光催化剂中,0.1%La/0.3Eu/TiO_2的催化活性最高,将其用于延安卷烟厂废水处理,太阳光连续照射6 h,COD_(Cr)去除率达78%。

The nano-TiO2 photocatalyst doped with rare-earth elements were prepared by sol-microwave method and characterized by XRD and UV-Vis absorption spectroscopy. The photocatalytic properties of as-prepared catalyst was investigated using methyl orange as the model pollutant. The results showed that the photocatalytic activities of TiO2 were enhanced by doping appropriate amount of La3＋ , Nd3＋ , Eu3＋ , Gd3＋ and Y3＋, and the optimal doping amounts of the elements were 0.1% ,0. 1% ,0.3% ,0.2% and 0.1% ,respectively. Using 0.1% La/0.3% Eu/TiO2 as the photocatalyst for the treatment of wastewater from Yan＇ an cigarette factory,CODcr removal rate reached 78% under sunlight for 6 h.