Jin Ruiben, Wu Zhongbiao, Liu Yue, Jiang Boqiong, Wang Haiqiang
Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China.
J Hazard Mater. 2009 Jan 15;161(1):42-8. doi: 10.1016/j.jhazmat.2008.03.041. Epub 2008 Mar 20.
A series of Si-doped TiO2 (Si/TiO2) photocatalysts supported on woven glass fabric were prepared by hydrothermal method for photocatalytic reduction of NO with NH3. The photocatalytic activity tests were carried out in a continuous Pyrex reactor with the flow rate of 2000mL/min under UV irradiation (luminous flux: 1.1x10(4)lm, irradiated catalyst area: 160cm2). The photocatalysts were characterized by X-ray diffraction (XRD), BET, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR) spectrophotometer, transmission electron microscopy (TEM), photoluminescence (PL) and temperature-programmed desorption (TPD). The experiment results showed that NO conversion on Si/TiO2 at 323K could exceed 60%, which was about 50% higher than that on Degussa P25 and pure TiO2. With the doping of Si, photocatalysts with smaller crystal size, larger surface area and larger pore volume were obtained. It was also found that Ti-O-Si bands were formed on the surface of Si/TiO2 and that the surface hydroxyl concentration was greatly increased. As a result, total acidity and NH3 chemisorption amount were enhanced for Si/TiO2 leading to its photocatalytic activity improvement.
采用水热法制备了一系列负载在玻璃纤维织物上的硅掺杂二氧化钛（Si/TiO₂）光催化剂，用于光催化NH₃还原NO。光催化活性测试在连续的派热克斯玻璃反应器中进行，紫外光照射下（光通量：1.1×10⁴lm，照射催化剂面积：160cm²），流速为2000mL/min。通过X射线衍射（XRD）、BET、X射线光电子能谱（XPS）、傅里叶变换红外（FT-IR）光谱仪、透射电子显微镜（TEM）、光致发光（PL）和程序升温脱附（TPD）对光催化剂进行了表征。实验结果表明，Si/TiO₂在323K时的NO转化率可超过60%，比Degussa P25和纯TiO₂高约50%。随着Si的掺杂，获得了晶体尺寸更小、表面积更大和孔体积更大的光催化剂。还发现Si/TiO₂表面形成了Ti-O-Si键，且表面羟基浓度大大增加。结果，Si/TiO₂的总酸度和NH₃化学吸附量增强，导致其光催化活性提高。
