Tian Guohui, Fu Honggang, Jing Liqiang, Tian Chungui
School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China.
J Hazard Mater. 2009 Jan 30;161(2-3):1122-30. doi: 10.1016/j.jhazmat.2008.04.065. Epub 2008 Apr 24.
Superior photoactive TiO(2) nanopowders with high crystallinity and large surface area were synthesized by a hydrothermal process in the presence of cetyltrimethylammonium bromide and a post-treatment with ammonia. The prepared photocatalysts were characterized by X-ray diffraction (XRD), Raman spectroscopy, N(2) adsorption-desorption, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), UV-vis diffuse reflectance spectra (DRS) and surface photovoltage spectroscopy (SPS). The prepared nanocrystallites were highly resistant to thermal sintering, and the calcinations up to 900 degrees C were shown to enhance the crystallinity of the anatase phase without any rutile phase and the separation rate of photoinduced charges of TiO(2) particles. It remained as large as 196 and 125 m(2)/g even after calcinations at 700 and 800 degrees C, respectively. The photocatalytic activity of prepared photocatalysts was obviously higher than that of commercial Degussa P25 on the photodegradation of methylene blue and phenol in water under ultraviolet-light irradiation, and the sample calcined at 800 degrees C afforded the highest photocatalytic activity.
在十六烷基三甲基溴化铵存在下通过水热法并经氨后处理合成了具有高结晶度和大表面积的优质光活性TiO₂纳米粉末。通过X射线衍射（XRD）、拉曼光谱、N₂吸附-脱附、透射电子显微镜（TEM）、X射线光电子能谱（XPS）、傅里叶变换红外光谱（FTIR）、紫外-可见漫反射光谱（DRS）和表面光电压光谱（SPS）对所制备的光催化剂进行了表征。所制备的纳米微晶对热烧结具有高度抗性，结果表明，在高达900℃的煅烧温度下，锐钛矿相的结晶度提高，且没有任何金红石相，TiO₂颗粒的光生电荷分离率也提高。即使在700℃和800℃煅烧后，其比表面积仍分别高达196和125 m²/g。在紫外光照射下，所制备的光催化剂对水中亚甲基蓝和苯酚的光降解活性明显高于市售的Degussa P25，且在800℃煅烧的样品具有最高的光催化活性。
