Abstract:
The sol-gel method was used to synthesize Gd-SiO2-TiO2 composite
photocatalysts. The sample showes the optimal photocatalytic activity during the methylene blue (MB) degradation. When the calcination temperature was lower than 550 ºC, Gd-SiO2-TiO2 photocatalyst has an anatase crystal structure. After doping of Si and Gd, the absorption wavelength thresholds of the sample approached 407 nm. Gd-SiO2-TiO2 photocatalyst showed the degradation efficiency about 90% to methylene blue (MB) under irradiation of simulated sunlight.
Now a days Environmental pollution becomes more and more serious problems . And organic pollution has become a serious problem in water environments. These pollutants could not be removed thoroughly by general physical and
chemical methods. Because of the mild reaction conditions, low cost and avoidance of secondary pollution. The photocatalytic oxidation technology s an important and potential applications in fields of pollutant degradation and decomposition of water to hydrogen.
The synthesis and photocatalytic activity of TiO2 have been investigated widely. Various techniques were carried out to develop TiO2 with high photocatalytic activity . And some research results indicate that the TiO2/SiO2 mixed oxide has higher activity than pure TiO2 while used as the photocatalyst . The added SiO2
strengthens the thermostability of anatase TiO2, increases its specific area and enhances its photocatalytic activity.
Reference:
https://www.sciencedirect.com/science/article/abs/pii/S0009261419306578
