Multifunctional composite of rGO/Fe_3O_4/Ag@AgCl for the repeated use in simultaneous adsorption, in-situ SERS monitoring and photocatalytic degradation of rhodamine B under visible light irradiation

摘要

Multifunctional composite of rGO/Fe_3O_4/Ag@AgCl, i.e. Fe_3O_4 nanoparticles (～300nm in size) and Ag@AgCl nanoparticles loaded on the carbon basal planes of reduced graphene oxide is synthesized in this work. The composite shows a high adsorption capacity of the RhB. The photocatalytic experiment results indicate that the degradation of RhB could reach 98% within 50 min visible-light irradiation and the photoactivity of the composite increases with the increasing rGO content. In addition, in-situ Raman scattering spectra can monitor the presence of RhB and its degradation reaction with the rGO/Fe_3O_4/ Ag@AgCl itself as the substrate. The reusability study suggests that the prepared composite can still maintain high degradation rate and catalyst recovery after five cycles, verifying its potential application in water purification.