氮氟与铕共掺杂纳米TiO_2催化剂的制备及可见光催化性能研究

Preparation of N,F and Eu^(3+) Co-doped TiO_2 and Its Photocatalytic Activity Under Visible Light

以氟化铵、硝酸铕和钛酸四丁酯为原料,采用溶胶-水热法制备出N、F和Eu^(3+)共掺杂可见光响应纳米TiO_2催化剂。通过X射线衍射(XRD)对其晶型和形态进行表征,催化剂呈锐钛矿型TiO_2纳米晶体,且N、F和Eu^(3+)的共掺杂有效抑制了纳米颗粒的增长。研究发现,当氮氟掺杂量为4.0%,铕为1.0%,煅烧温度为400℃时,纳米催化剂可见光催化性能最好。在催化剂用量为1.5 g/L,溶液pH值为2.45,苯酚初始浓度为40 mg/L条件下,氙灯模拟可见光照射2 h,苯酚的降解率接近100%。非金属N、F和金属Eu^(3+)的共掺杂,能有效提高TiO_2纳米粉体光催化活性。

Nano N,F,Eu^（3＋）/ TiO_2 photo catalysts were synthesized by a sol-hydrothermal method with tetrabutyl titanate as precursor,ammonium fluoride with europium nitrate as dopants. Characterized by X-ray powder diffraction（XRD） indicates samples were all anatase nano powders,and the UV-absorption range was broadened to the visible region to some extent. The highest catalytic activity of N,F,Eu^（3＋）-TiO_2 could be obtained at 4. 0% ammonium fluoride and 1.0% Eu while calcining at400℃. The degradation ratio could reach nearly 100% for 200 m L solution with 40 mg/L phenol at 1. 5 g/L TiO_2 dose,2.0h visible light irradiation and pH = 2. 45.