Bi2S3@NH2-UiO-66-S composites modulated by covalent interfacial reactions boost photodegradation and the oxidative coupling of primary amines

Abstract

Heterojunctions have attracted much attention due to the efficient separation and conduction of charge carriers in the photocatalytic reactions. However, the interfacial energy barrier between two components still limits the controllable assembly, separation, and conduction of photoexcited charge carriers, and further lower the photocatalytic activity. How to control the assembly of the heterojunction and accelerate the separation and conduction of photogenerated electron–holes by building a more intimate interfacial interaction is an important area of research. Herein, we report a series of Bi₂S₃@NH₂-UiO-66-S heterostructures prepared by the covalent interfacial reaction. Novel composites exhibit excellent efficiencies for the photodegradation of methylene blue and the oxidative coupling of benzylamine and its derivatives. The turnover frequency is estimated to be about 8083 μmol g_cat⁻¹ h⁻¹. The super photocatalytic performance was attributed to the interfacial compactness by the covalent interfacial reaction. The expansion for the excellent performance was confirmed by UV-vis DRS, photocurrent measurement and EIS.