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Microbial synthesis of graphene‐supported highly‐dispersed Pd‐Ag bimetallic nanoparticles and its catalytic activity
Author(s) -
Han Ruishan,
Song Xin,
Wang Qianhua,
Qi Yushun,
Deng Guozhi,
Zhang Aiyong,
Wang Qinian,
Chang Fangyuan,
Wu Chao,
Cheng Yuanyuan
Publication year - 2019
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6150
Subject(s) - shewanella oneidensis , graphene , bimetallic strip , catalysis , palladium , materials science , raman spectroscopy , oxide , nanoparticle , fourier transform infrared spectroscopy , x ray photoelectron spectroscopy , nuclear chemistry , silver nitrate , nanomaterials , 4 nitrophenol , chemical engineering , inorganic chemistry , chemistry , nanotechnology , organic chemistry , metallurgy , genetics , physics , engineering , bacteria , optics , biology
BACKGROUND Graphene‐supported nanocomposites are promising catalysts for their unique properties. Biosynthesis of such hybrid catalysts possesses several advantages over other methods such as less pollution. The palladium nanoparticle has versatile catalytic activities and its stability and activities can be significantly improved through hybridization with other nanomaterials including graphene. RESULTS In this study, bimetallic palladium‐silver nanoparticles supported on graphene (Pd‐Ag/rGO) was prepared through one‐step biosynthesis using a bacterium Shewanella oneidensis MR‐1. Shewanella oneidensis MR‐1 synthesized Pd‐Ag/rGO through simultaneous reduction of silver nitrate (AgNO 3 ), palladium(II) nitrate (Pd(NO 3 ) 2 ) and graphene oxide (GO). The morphology and composition of the Pd‐Ag/rGO were characterized by transmission electron microscopy, energy dispersive X‐ray, X‐ray diffraction, X‐ray photoelectron spectroscopy, Fourier‐transform infrared spectroscopy and Raman spectroscopy. Furthermore, the hydrogenation activity of synthesized Pd‐Ag/rGO was tested using 4‐nitrophenol as a model chemical at room temperatures and pressure. The Pd‐Ag/rGO showed the best catalytic performance when Pd/Ag ratio was 1:1 and bacterial concentration was 1.0 of OD 600 (optical density measured at a wavelength of 600 nm) for the preparation of Pd‐Ag/rGO. Therefore, the kinetic rate constant for 4‐NP reduction was 0.2413 min −1 catalyzed by as‐prepared Pd‐Ag/rGO, which is listed as one of the top level reported catalysts for 4‐NP reduction. CONCLUSION Therefore, this study demonstrated a material and energy‐saving method to synthesize hybrid nanoparticles supported on graphene with high catalytic activity. © 2019 Society of Chemical Industry