In-situ growth pH-adjusted iodine defects engineering BiOI film on 3D-printed polymer substrate for efficient organic pollutant and microorganism purification

Abstract

Although BiOI has been constructed on FTO or metals to overcome the application shortcomings of powdered photocatalyst, but BiOI film with customizable size and shape will be more suitable for purification environments. In this study, 3D-printed polymer models-likes carbon nanotube, graphene ball, and metal–organic framework are exampled to act as substrates. Compared with the traditional heterostructure film fabricated at complicated temperature and pressure, we report a facile route to synthesize the iodine-defect engineering BiOI film on 3D-printed polymer, under mild room temperature and pressure through only adjusting BiOI solution pH value. The produced iodine vacancies can act as traps to facilitate the separation of electron-holes carriers. Additionally, a self-converted LED device enhances the utilized efficiency of irradiated light. This work reveals good purification efficiency on ca. 99.67% degradation rate towards RhB and >99.99% inactivation rate against E. coli and S. aureus in 1 or 3 h because of the [rad]O2−, [rad]OH and h+ redox.