Nano-sized La₂Ti₂O₇ oxides were synthesized by sol-gel route. The photocatalytic properties of the Rhodamine B degradation on this photocatalyst were studied as a function of crystallite size, dye concentration, catalyst loading, temperature and intensity of UV light flux. The photocatalytic results as well as the microstructural analysis, carried out by X-ray Diffraction and Transmission Electron Microscopy, revealed a strong correlation between the apparent rate constant and the crystallite size/degree of crystallinity of the photocatalyst. Temperature studies have shown optimum photocatalysis at 40 °C. Measurements of the zeta potential as a function of pH made it possible to determine the point of zero charge of the photocatalyst at pH = 8 and to understand the influence of pH on the degradation of cationic or anionic pollutants. Finally, the sonophotocatalytic process was studied showing a noticeable improvement in the apparent rate constant, multiplied by a factor of ∼1.7 compared to photocatalysis alone. The synergistic effect was quantified via measurements in sonocatalysis alone and then coupled to UV irradiation. This synergistic effect is about 23 % in the case of degradation of Rhodamine B on La₂Ti₂O₇ oxides synthesized at 1000 °C.

纳米La ₂ Ti ₂ O ₇通过溶胶-凝胶法合成了氧化物。研究了若丹明B降解在该光催化剂上的光催化性能，它是微晶尺寸，染料浓度，催化剂载量，温度和紫外线强度的函数。通过X射线衍射和透射电子显微镜进行的光催化结果以及显微结构分析表明，表观速率常数与光催化剂的微晶尺寸/结晶度之间具有很强的相关性。温度研究表明在40°C时具有最佳的光催化作用。Zeta电位作为pH的函数的测量使得可以确定在pH = 8时光催化剂的零电荷点，并了解pH对阳离子或阴离子污染物降解的影响。最后，研究了声光催化过程，与单独的光催化相比，表观速率常数有显着改善，乘以约1.7倍。通过单独在声催化中的测量来量化协同效应，然后将其耦合至紫外线辐射。如果罗丹明B在La上降解，则这种协同作用约为23％在1000°C下合成_2种Ti ₂ O ₇氧化物