N掺杂纳米TiO_2的制备及光催化性能研究

以盐酸羟胺为N源,按r(盐酸羟胺:钛酸四丁酯)分别为1:2,1:1,3:2,2:1和3:1掺杂,采用sol-gel法一步制备N掺杂纳米TiO2。研究了焙烧温度和N掺杂量对样品晶相结构及其在紫外光和紫外–可见光下对罗丹明B光催化活性的影响。结果表明,增大N掺杂量可抑制样品由锐钛矿相向金红石相转变。r(盐酸羟胺:钛酸四丁酯)为2:1时,样品经500℃焙烧后对罗丹明B的紫外光催化降解率1h内达54.81%,样品经600℃焙烧后对罗丹明B的紫外–可见光催化降解率2h内可达99.13%。

Preparation and photocatalytic activity of N-doped nano-TiO_2

The N-doped nano-TiO_2 (nano-N-TiO_2),which was doped with different mole ratio of hydroxylamine hydrochloride to tetrabutyl titanate (1:2,1:1,3:2,2:1 and 3:1),was prepared by a one-step sol-gel method using hydroxylamine hydrochloride as nitrogen source in the doping procedure.Influences of calcination temperature and mole ratio of hydroxylamine hydrochloride to tetrabutyl titanate on the crystal phase structure and photocatalytic activity of the prepared nano-N-TiO_2 samples for degradation of rhodamine B under UV and UV-Vis light were investigated.The results show that the crystal phase transformation for the nano-N-TiO_2 samples from anatase to rutile phase is restrained by increasing the N-doping amounts.When the mole ratio of hydroxylamine hydrochloride to tetrabutyl titanate is 2:1,the nano-N-TiO_2 sample calcined at 500 ℃ shows the photocatalytic degradation rate of 54.81% to rhodamine B within 1 h under UV light,while the nano-N-TiO_2 sample calcined at 600 ℃ shows the photocatalytic degradation rate of 99.13% to rhodamine B within 2 h under UV-Vis light.