Facile synthesis of Fe/Bi 2SiO 5 nanocomposite with enhanced photocatalytic activity for degradation of 17β-Estradiol(E2)

摘要

In the present work, element modification semiconductor photocatalyst Fe-Bi2SiO5was successfully synthesized by combining the hydrothermal method and impregnation technique. The obtained photocatalysts were systematically characterized through XRD, SEM, XPS, BET and UV–Vis diffuse reflectance spectroscopy. The synthesized heterojunction Fe/Bi2SiO5photocatalyst exhibited excellent photocatalytic activity for 17β-Estradiol(E2). While using 20?W mercury lamp as UV light source, the degradation efficiency of E2 by 5% Fe/Bi2SiO5(the molar ratio of Fe/Bi was 5:100) at 60?min irradiation was 99.5%. The rate constant of E2 degradation on 5% Fe/Bi2SiO5were about 3.42 times of the P25 and 2.63 times of the pure Bi2SiO5. The impact of catalyst loading and pH as well as the photocatalytic mechanism was investigated. The possible photocatalytic mechanism has been discussed on the basis of the theoretical calculation and the experimental results. The results of this study indicated that Fe/Bi2SiO5was a stable and efficient photocatalyst, with promising practical applications.