Fabrication of an FAPbBr3/g-C3N4 heterojunction to enhance NO removal efficiency under visible-light irradiation

Previously, many methods have been used to reduce NOx pollution. Semiconductor photocatalytic oxidation technology has been widely used among those methods because of its environmental friendliness, high efficiency, and simple implementation. Hybrid halide perovskites with exceptional optical properties prove to be promising photocatalysis material; however, their high surface energy, unpaired bonds, and instability are obstacles to large-scale application. In this work, FAPbBr3/g-C3N4 heterostructures were successfully synthesized by growing FAPbBr3 nanocrystals on 2D g-C3N4 nanosheets. Compared with the pristine elements, FAPbBr3/g-C3N4 composites show significant NO removal efficiencies under 600 ppb concentration at room temperature. The high performance could be attributed to the formation of a type-II heterojunction and accelerated the separation and transfer of electrons and holes. Furthermore, cycling experiments and XRD results verify that the FAPbBr3/g-C3N4 heterojunction owns good stability. Thus, this work not only shows the great potential prospect of halide perovskite for the photocatalysis field, but also demonstrate its promise in solving energy issues and environment science.