Enhanced Photodegradation of Toxic Pollutants on Plasmonic Au–Ag–AgI/Al2O3 Under Visible Irradiation

摘要: Au–Ag–AgI nanoparticles (NPs) were uniformly dispersed onto mesoporous alumina by deposition–precipitation and photoreduction at low temperature. Compared with Ag–AgI/Al2O3, the catalyst showed higher photocatalytic activity under visible irradiation. In particular, release of metal ions from was significantly inhibited during photodegradation pollutants. Electron spin resonance cyclic voltammograms studies a variety experimental conditions verified that coupling Au Ag NPs increased efficiency light energy conversion accelerated interfacial electron transfer processes. The main active species involved in photoreaction Au–Ag–AgI/Al2O3 O2 •− excited h+ on NPs. presence several ubiquitous anions, including HCO3 −, SO4 2−, NO3 − could act as donors trapping to facilitate circulation. results obtained herein indicated coupled, noble, bimetal exhibited high photosensitivity photostability due enhanced surface plasmon transfer. Addition made disperse more Al2O3