N掺杂TiO_2光催化剂的制备及其H_2O_2改性的研究

以钛酸四丁酯为前驱物,采用水解沉淀法制备了N掺杂TiO_2光催化剂和H_2O_2改性的N掺杂TiO_2光催化剂.实验表明,H_2O_2改性的N掺杂TiO_2光催化剂的最佳制备条件为:氨水(质量分数28%)加入量20 mL,焙烧温度500 ℃,H_2O_2(质量分数30%)加入量2.0 mL.日光下,N掺杂TiO_2光催化剂及H_2O_2改性的N掺杂TiO_2光催化剂在反应90 min时的活性红紫去除率达99%,它们对活性红紫的去除率远高于P_(25)TiO_2光催化剂.H_2O_2改性的N掺杂TiO_2光催化剂中N质量分数比改性前明显提高,制备的两种催化剂中不仅含有N元素,同时还含有C和H元素.

Preparation of Photocatalyst N-Doped TiO_2 and Its Modification by H_2O_2

Using Ti(OC_4H_9)_4 as the reaction precursor, the compounded photocatalyst N-doped TiO_2 was prepared by hydrolysis-precipitation method, and then modified by H_2O_2. The optimum conditions for preparation of H_2O_2-modified N-doped TiO_2 are as follows; ammonia dosage 20 mL (with 28% of mass fraction) , calcination temperature 500 ℃, H_2O_2 dosage 2. 0 mL( with 30% of mass fraction). After 90 min of reaction on N-doped TiO_2 or H_2O_2-modified N-doped TiO_2 under sunlight, the removal efficiencies of reactive red-violet by the two photocatalysts are both 99% , which are greatly higher than that by photocatalyst P_(25)TiO_2. Compared with N-doped TiO_2, the mass fraction of N in H_2O_2-modified N-doped TiO_2 is significantly increased. Both of the two photocatalysts contain not only element N, but also elements C and H.