Nitrogen–fluorine-codoped TiO

Abstract

Bisphenol A (BPA) is an environmental estrogen in daily life, and it often appears in sewage, surface water and even drinking water. It will accumulate in the human body and threaten physical health. We prepared a visible light-driven N–F-TiO2/ZIF-8 photocatalyst through an in situ heterogeneous deposition method. The prepared samples were further analysed by XRD, SEM, TEM, PL spectroscopy and UV-vis DRS. Binary N–F-TiO2/ZIF-8 had a good effect on the degradation of BPA under visible light irradiation. It was determined through experiments that the optimal dosage of N–F-TiO2/ZIF-8 (7:3) was 10 mg with the highest observed photocatalytic activity (86.1%). The high adsorption capacity of ZIF-8 was due to its large specific surface area. The improvement of photocatalytic activity was mainly due to the high separation rate of electron–hole pairs of N–F-TiO2/ZIF-8. N–F-TiO2/ZIF-8 also had good stability after five cycles of photodegradation reaction. In addition, the free radical capture experiment confirmed that •OH was the main active substance for the photocatalytic degradation of BPA. In addition, the removal ability of bisphenol A by the binary composite in real water was studied using lake water.