CAJ | 학술논문

为拓展TiO_2可见光的响应范围,以氨水为氮源,在常温条件下采用水解沉淀法制备了氮掺杂TiO_2粉末.以X射线衍射、紫外-可见漫反射吸收光谱和X射线光电子能谱等对TiO_2进行了表征.对可见光照射下的光催化活性进行了测试,并考察了煅烧温度及掺杂量等对光催化活性的影响.结果表明:氮掺杂致使TiO_2吸收边带向可见光区偏移,在降解亚甲基蓝的实验中表现出良好的可见光催化活性;随煅烧温度的增加,氮摩尔分数增加,晶粒增大,可见光催化活性减弱;煅烧温度为400 ℃,氮的摩尔分数为 2% 时制备样品的光催化活性最高.
위탁전TiO_2가견광적향응범위,이안수위담원,재상온조건하채용수해침정법제비료담참잡TiO_2분말.이X사선연사、자외-가견만반사흡수광보화X사선광전자능보등대TiO_2진행료표정.대가견광조사하적광최화활성진행료측시,병고찰료단소온도급참잡량등대광최화활성적영향.결과표명:담참잡치사TiO_2흡수변대향가견광구편이,재강해아갑기람적실험중표현출량호적가견광최화활성;수단소온도적증가,담마이분수증가,정립증대,가견광최화활성감약;단소온도위400 ℃,담적마이분수위 2% 시제비양품적광최화활성최고.
With a view to extending titanium dioxide (TiO_2) respondence to the range of visible light, the N-doped TiO_2 photocatalysts were prepared based on the hydrolysis precipitation method at room temperature with ammonia as the nitrogen source. The as-prepared samples photocatalysts were characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance pectroscopy (Uv-vis DRS) and X-ray photoelectron spectroscopy (XPS). Photocatalytic activity was tested under the irradiation of visible light, and the impacts of the calcination temperature and doping on photocatalytic activity were examined.The results showed that the absorption band edge of TiO_2 shifted to the visible light region upon nitrogen-doping. Visible light catalytic activity was observed in the experiment of the decoloration of methylene blue. With the increase of calcination temperature or the nitrogen content, grain size increased, and visible light catalytic activity decreased. The samples had the highest photocatalytic activity with the calcination temperature of 400 ℃ and N/Ti mole ratio of 2%.