Departamento de Química Inorgánica, Universidad de Salamanca, 37008 Salamanca, Spain.
Molecules. 2022 May 2;27(9):2904. doi: 10.3390/molecules27092904.
Two titania photocatalysts have been prepared using the sol-gel method using TiCl as a precursor, and two different alcohols, namely, ethanol or propanol (Et or Pr). The main aim of this work was to study the effect of the nature of the alcohol on the chemical, structural and photocatalytic properties for paracetamol photodegradation of the final solids. The TiCl/alcohol molar ratio to obtain the corresponding alkoxides (TiEt and TiPr) was 1/10. These alkoxides were calcined at 400 °C to prepare the oxide catalysts (named as TiEt400 and TiPr400). Powder X-ray diffraction (PXRD) of the original samples showed the presence of anatase diffraction peaks in sample TiPr, while TiEt is a completely amorphous material. Contrary to commercial TiO-P25, the PXRD diagrams of the calcined samples showed anatase as the exclusive crystalline phase in both solids. The specific surface area (S) of sample TiPr400 was larger than that of sample TiEt400, and both larger than that of TiO-P25. The three solids have been tested in the photodegradation of paracetamol in aqueous solution. It has been established that the alcohol used influences the properties and catalytic activity of the final oxides. The synthesized solids exhibit a higher activity than commercial TiO-P25, because of their structural characteristics and larger S.
两种二氧化钛光催化剂采用溶胶-凝胶法，以 TiCl 为前驱体，使用两种不同的醇，即乙醇或丙醇（Et 或 Pr）进行制备。这项工作的主要目的是研究醇的性质对最终固体中扑热息痛光降解的化学、结构和光催化性能的影响。TiCl/醇摩尔比为 1/10，以获得相应的烷氧基（TiEt 和 TiPr）。这些烷氧基在 400°C 下煅烧以制备氧化物催化剂（分别命名为 TiEt400 和 TiPr400）。原始样品的粉末 X 射线衍射（PXRD）显示样品 TiPr 中存在锐钛矿衍射峰，而 TiEt 是完全无定形的材料。与商业 TiO-P25 相反，煅烧样品的 PXRD 图谱显示两种固体中均只有锐钛矿为唯一的结晶相。样品 TiPr400 的比表面积（S）大于样品 TiEt400，且均大于 TiO-P25。已在水溶液中对三种固体进行了扑热息痛的光降解测试。已确定使用的醇会影响最终氧化物的性质和催化活性。由于其结构特性和较大的 S，合成的固体表现出比商业 TiO-P25 更高的活性。
