溴掺杂TiO_2光催化剂的制备与性能研究

以KBr和Ti(SO4)2为原料,通过水热法制备了高催化活性的溴掺杂纳米TiO2(Br-TiO2)光催化剂,利用XRD、XPS、TEM、BET和UV-Vis DRS等测试手段对其进行了表征。通过苯酚降解实验评价了Br-TiO2的光催化活性。结果表明,700℃焙烧、溴与钛的摩尔比为0.35∶1时,Br-TiO2具有最佳光催化活性。该催化剂为晶体发育完整的锐钛矿相TiO2,粒径平均大小为50 nm,比表面积为16.81 m2/g,在紫外区的吸收得到加强,光催化能力优于Degussa P-25。确定了降解苯酚的最佳条件:催化剂投加量为0.5 g/L,苯酚初始浓度为10 mg/L,pH值为6.0。

Preparation and photocatalytic performance of bromine-doped TiO2 photocatalyst

A novel bromine-doped TiO_2 photocatalyst was obtained by hydrothermal method with potassium bromide and titanium sulfate. The samples were characterized by XRD, XPS, TEM, BET and UV-Vis absor-bance spectra. Its photocatalytic activity was examined by degradation of phenol. The result shows that after cal-cination at 700 ℃ , when the ratio of bromine and titanium is 0. 35: 1, Br-TiO_2 has the best photocatalytic activi-ty. It is in anatase phase, the average particle size and the BET surface reaches 50 nm and 16. 81 m~2/g, respec-tively. It shows strong absorption in ultraviolet light region and the photocatalytic activity is higher than degussa P-25. The best degradation effect acquires at pH value 6. 0, catalyst dosage 0. 5 g/L, initial concentration of phenol 10 mg/L.