Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) CONICET, Universidad Nacional de La Plata (UNLP), La Plata, 1900, Argentina,
Environ Sci Pollut Res Int. 2015 Sep;22(18):14291-8. doi: 10.1007/s11356-015-4667-4. Epub 2015 May 15.
Pure and cerium-doped [0.05, 0.1, 0.3, 0.5, and 1.0 Ce nominal atomic % (at.%)] TiO2 was synthesized by the sol-gel method. The obtained catalysts were characterized by X-ray diffraction (XRD), UV-visible diffused reflectance spectroscopy (DRS), Raman, and BET surface area measurement. The photocatalytic activity of synthesized samples for the oxidative degradation of phenol in aqueous suspension was investigated. The content of Ce in the catalysts increases both the transition temperature for anatase to rutile phase transformation and the specific surface area, and decreases the crystallite size of anatase phase, the crystallinity, and the band gap energy value. The material with higher efficiency corresponds to 0.1 Ce nominal at.%. Under irradiation with 350 nm lamps, the degradation of phenol could be described as an exponential trend, with an apparent rate constant of (9.1 ± 0.6) 10(-3) s(-1) (r(2) = 0.98). Hydroquinone was identified as the main intermediate.
采用溶胶-凝胶法合成了纯相及铈掺杂（名义原子百分比为 0.05、0.1、0.3、0.5 和 1.0）的[0.05、0.1、0.3、0.5 和 1.0 Ce 名义原子%（at.%）]TiO2。采用 X 射线衍射（XRD）、紫外-可见漫反射光谱（DRS）、拉曼和 BET 比表面积测试对所得催化剂进行了表征。考察了合成样品在水悬浮液中光催化氧化降解苯酚的活性。催化剂中 Ce 的含量增加了锐钛矿相向金红石相转变的转变温度和比表面积，降低了锐钛矿相的晶粒尺寸、结晶度和带隙能值。效率更高的材料对应于 0.1 Ce 名义 at.%。在 350nm 灯照射下，苯酚的降解可以用指数趋势来描述，表观速率常数为（9.1±0.6）10(-3) s(-1)（r(2)=0.98）。鉴定出的主要中间产物是对苯二酚。
