以ACF为模板制备掺氮TiO_2及其光催化脱氨氮研究

Preparation of N Doped TiO_2 by Using ACF as Template and Its Photocatalytic Application in Removing Nitrogen from Water

本文采用溶胶-凝胶法制备了以活性炭纤维(ACF)为模板的掺氮TiO2光催化剂,利用XRD、XPS、TEM、SEM和UV-Vis等方法对催化剂进行了表征,测定了催化剂在紫外、日光照射下光催化脱氨氮的活性.ACF作模板掺氮TiO2催化剂具有介孔结构,平均粒径约为10 nm,比表面积为64.43 m2/g.紫外、可见光光催化2 h氨氮(85 mg/L)废水的氨氮去除率分别为68%和47%.结果表明,催化剂中氮的含量是影响催化剂光催化活性的重要因素.

TiO2-xNx nanoparticles were prepared by a sol-gel method with using ACF as template, and were characterized using various techniques such as XRD, SEM and TEM, XPS and UV-Vis. The particles were mainly in anatase form, about 10 nm in size, with certain nanotube structures （d 5 nm）. The ratio of Ti to N in N doped TiO2 can reach 1 ： 0.19. The absorbency wavelength in UV- Vis spectra may extend to 700--800 nm. The photocatalytic activities of TiO2x-Nx were evaluated by the photocatalytic oxidation of ammonia in water using ultraviolet or solar light as light source. The beast ammonia removal（2 h） under solar light and UV photocatalysis reached 47% and 68% respectively. It is concluded that nitrogen doping contributes to visible light activity and oxidative removal of ammonia from water.