Enhanced catalytic activity of Ag nanoparticles supported on polyacrylamide/polypyrrole/graphene oxide nanosheets for the reduction of 4-nitrophenol

摘要

Graphical abstractAg/PAM/PPy/GO composite nanosheets were successfully synthesized, which exhibited an excellent catalytic activity for the reduction of 4-NP by NaBH4, and the corresponding catalytic mechanism has been revealed by investigating the effect of different components of Ag/PAM/PPy/GO composite nanosheets on the catalytic performance.Display OmittedHighlights•Ag/PAM/PPy/GO composite nanosheets were successfully synthesized.•They exhibited an excellent catalytic activity for the reduction of 4-NP by NaBH4.•The corresponding catalytic mechanism has been revealed.•The effect of different components on the catalytic performance were detailedly investigated.•The composite nanosheets can act as excellent recyclable catalysts for the reduction of 4-NP.AbstractHigh-density and well-dispersed Ag nanoparticles (Ag NPs) with a mean size of 20nm have been successfully supported on the surface of polyacrylamide functionalized polypyrrole/graphene oxide (PAM/PPy/GO) nanosheets. The obtained Ag/PAM/PPy/GO composite nanosheets exhibited an excellent catalytic activity for reduction of 4-nitrophenol by NaBH4with the kinetic reaction rate constant of 3.38×10−2s−1due to the synergistic effect of all the components of the composite nanosheets. The corresponding catalytic mechanism has been revealed by investigating the effect of different components of Ag/PAM/PPy/GO composite nanosheets on the catalytic performance: GO with the excellent two-dimensional structures offered large surface area for the immobilization of more Ag NPs; PPy with a high electric conductivity promoted the electron transport in the reduction of 4-NP; PAM did not only act as a good linker between Ag NPs and PPy/GO nanosheets for the synthesis of Ag/PAM/PPy/GO composite nanosheets, but also could facilitate the efficient contact between 4-NP and Ag NPs; Ag NPs were the catalytic active site for the reduction of 4-NP, respectively.