Luévano-Hipólito E, Martínez-de la Cruz A, López Cuéllar E
CIIDIT, Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, Ciudad Universitaria, C.P. 66451, San Nicolás de los Garza, N.L, Mexico.
Environ Sci Pollut Res Int. 2017 Mar;24(7):6361-6371. doi: 10.1007/s11356-016-7310-0. Epub 2016 Jul 30.
ZnO samples were prepared by sol-gel method applying a factorial design in order to improve the photocatalytic properties of the semiconductor oxide in the NO photooxidation reaction. The concentrations of zinc acetate and ammonium hydroxide were selected as critical variables in the synthesis of ZnO. Nine samples of ZnO were obtained as product of the factorial design and were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, diffuse reflectance spectroscopy, and N adsorption-desorption isotherms. The photocatalytic activity of ZnO samples was associated with the physical properties developed by each sample according to its respective conditions of synthesis. Some photocatalytic reaction parameters, such as mass of photocatalyst, irradiance, and relative humidity, were modified in order to evaluate its effect in the photocatalytic conversion of NO. As a relevant point, the relative humidity played an important role in the increase of the selectivity of the NO photooxidation reaction to innocuous nitrate ions when ZnO was used as photocatalyst.
采用溶胶-凝胶法并应用析因设计制备了ZnO样品，以提高半导体氧化物在NO光氧化反应中的光催化性能。选择醋酸锌和氢氧化铵的浓度作为ZnO合成中的关键变量。通过析因设计得到了九个ZnO样品，并对其进行了X射线粉末衍射、扫描电子显微镜、透射电子显微镜、漫反射光谱和N吸附-脱附等温线表征。ZnO样品的光催化活性与每个样品根据其各自合成条件所呈现的物理性质相关。为了评估其对NO光催化转化的影响，对一些光催化反应参数，如光催化剂质量、辐照度和相对湿度进行了调整。一个相关要点是，当使用ZnO作为光催化剂时，相对湿度在提高NO光氧化反应对无害硝酸根离子的选择性方面发挥了重要作用。
