Facile two-step synthesis of Ag nanoparticles dispersed on N, S co-doped RGO for highly efficient plasmonic photocatalytic water purification

摘要

AgNPs/NSRGO nanocomposite was firstly synthesized by facile two-step methods, exhibiting higher visible-light catalytic performance than GO and commercial TiO2 (P25). According to the reaction rate constant, AgNPs/NSRGO shows 8.3 and 5.3 times photoactivity compared to P25 for degrading methylene blue and 4-nitrophenol, respectively. Furthermore, the nanocomposite kills 98.6% of Escherichia coli in 3 h while P25 only 27.4%. We also infer that the improved photoactivity is attributed to the impurity levels of heteroatoms and plasmonic effect from AgNPs, resulting in narrowing bandgap of composite, efficient separation of charge carriers and generation of more reactive oxygen species.