Efficient removal of bisphenol A from water using a novel organic-inorganic hybrid heterojunction

Organic -inorganic hybrid heterojunctions have the ability to efficiently remove trace pollutants from water due to efficient photosensitivity. In this work, an organic -inorganic hybrid S -scheme heterojunction photosensitizer (RCP-BW) was successfully fabricated by growing cross -linked beta-CD/riboflavin copolymer on the surface of bismuth tungstate (Bi 2 WO 6 ). The fabrication of the copolymer retains the photosensitivity of riboflavin and the confinement effect of beta-CD and forms an internal electric field with Bi 2 WO 6 to enhance the photoelectron transport ability. Photogenerated electrons are transferred and stacked from Bi 2 WO 6 to beta-CD/riboflavin copolymers, which greatly enhances the ability of organic copolymers to reduce oxygen and produce superoxide radicals. We combined electrochemistry, free radical chemistry and DFT to study the photoelectron migration mechanism and photocatalytic performance enhancement mechanism in S -scheme heterojunctions. The pseudofirst -order reaction kinetic constant (k RCP-BW = 0.081 min -1 ) for BPA degradation was four times that of unmodified BW (k BW = 0.020 min -1 ). beta-CD regulates the band structure of riboflavin to match with Bi 2 WO 6 , and utilizes charged contaminants and intermediate degradation products to promote the production of reactive oxygen species through interface electron transfer and excited state transition energy transfer. This work provides theoretical support and technical means for photocatalytic oxidation technology to control endocrine disruptors.