Novel Ag2S nanoparticles on reduced graphene oxide sheets as a super-efficient catalyst for the reduction of 4-nitrophenol
Here, Ag 2 S nanoparticles on reduced graphene oxide (Ag 2 S NPs/RGO) nanocomposites with relatively good distribution are synthesized for the first time by conversing Ag NPs/RGO to Ag 2 S NPs/RGO via a facile hydrothermal sulfurization method. As an noval catalyst for the reduction of 4-nitrophenol (4-NP), it only takes 5min for Ag 2 S NPs/RGO to reduce 98% of 4-NP, and the rate constant of the composites is almost 13 times higher than that of Ag NPs/RGO composites. The high catalytic activity of Ag 2 S NPs/RGO can be attributed to the following three reasons: (1) Like metal complex catalysts, the Ag 2 S NPs is also rich with metal center Ag (δ + ), with pendant base S (δ - ) close to it, and thus the Ag and basic S function as the electron-acceptor and proton-acceptor centers, respectively, which facilitates the catalyst reaction; (2) RGO features the high adsorption ability toward 4-NP which provides a high concentration of 4-NP near the Ag 2 S NPs; and (3) electron transfer from RGO to Ag 2 S NPs, facilitating the uptake of electrons by 4-NP molecules.
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