稀土、Fe^(3+)掺杂TiO_2光催化降解水中氨氮研究

Degradation of Ammonia Nitrogen in Wastewater by Lanthanon and Fe^(3+)Doped TiO_(2) Photocatalysis

以溶胶-凝胶法制备了纳米TiO_2和稀土离子Eu^(3+)、Y^(3+)、La^(3+)、Tb^(3+)、Dy^(3+)及Fe^(3+)掺杂的TiO_2,并以之为催化剂进行在超声波氙灯照射下降解氨氮污水。实验结果表明稀土或Fe^(3+)掺入TiO_2后使TiO_2光响应范围向可见光拓展,提高了氨氮污水的降解率;Fe^(3+)和稀土离子共掺杂后,La-Fe-TiO_2、Eu-Fe-TiO_2和TbFe-TiO_2氨氮污水降解率均比单掺杂提高。

Nano-TiO2 with photocatalytie activity were prepared by sol-gel progress. Tb3＋, Eu3＋, ya＋ Laa＋ Dy3＋ ,Fe3＋ were adoped to enhance the photocatalytic activity. The degradation of ammonia nitro- gen wastewater was investigated by TiO2 catalyst. The reaction also features the photocatalytic activity of Nano-TiO2. The results indicate that titania doped lanthanon could efficiently improve the photoactivity and expand the visible light response range. Fea＋ could reduce the chance of photo-generated electron- hole recombination and increase the photodegradation efficiency. The NHa-N photodegradation by La- Fe-TiO2 （Eu-Fe-TiO2 or Tb-Fe-TiO2 ） was higher than that by Fe-TiO2 or La-TiO2 （Eu-TiO2 or Tb- TiO2 ）.