Highly stable heterostructured Ag–AgBr/TiO2 composite: a bifunctional visible-light active photocatalyst for destruction of ibuprofen and bacteria

Abstract

A bifunctional visible-light photocatalyst Ag–AgBr/TiO₂ was synthesized by a facile one-pot method. The three-component composite exhibited much superior visible-light photocatalytic activities for ibuprofen (IBP) degradation and mineralization as compared to single-component (TiO₂) and two-component (Ag/TiO₂, Ag–AgBr) systems, as well as the conventional Ag–AgBr/P25. After 6 h of white LED irradiation, 81% of organic carbon could be mineralized along with decreased aromaticity and toxicity of the IBP degradation products. Meanwhile, the synthesized Ag–AgBr/TiO₂ exhibited much stronger antibacterial activities than TiO₂ and conventional Ag–AgBr/P25 under white LED irradiation. More interestingly, the Ag–AgBr/TiO₂ had novel antibacterial activities against E. coli in the dark as compared to other Ag–AgBr/semiconductor photocatalysts that have been reported. For the first time, the action spectrum of Ag–AgBr/TiO₂ was investigated using different colors of LED to elucidate the roles of Ag nanoparticles and AgBr in its visible-light photocatalytic activity. It reveals that both AgBr and Ag nanoparticles were photoactive species contributing to the high photocatalytic performance. Among the various oxidative species (h⁺, ˙OH, O₂˙⁻ and ¹O₂), O₂˙⁻ was the predominant species involved in IBP degradation upon the Ag–AgBr/TiO₂ under white LED irradiation. The visible-light photocatalytic mechanism of Ag–AgBr/TiO₂ and factor contributing to its high photostability in water are proposed.