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Biosynthesis of au nanoparticles by a marine bacterium and enhancing their catalytic activity through metal ions and metal oxides
Author(s) -
Zhang Haikun,
Hu Xiaoke
Publication year - 2018
Publication title -
biotechnology progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.572
H-Index - 129
eISSN - 1520-6033
pISSN - 8756-7938
DOI - 10.1002/btpr.2727
Subject(s) - metal , catalysis , x ray photoelectron spectroscopy , chemistry , metal ions in aqueous solution , reaction rate constant , humic acid , nucleation , nuclear chemistry , fourier transform infrared spectroscopy , nanoparticle , ion , inorganic chemistry , kinetics , chemical engineering , nanotechnology , materials science , organic chemistry , fertilizer , physics , quantum mechanics , engineering
The authors report that a marine Shewanella sp. CNZ‐1 is capable of producing Au NPs under various conditions. Results showed that initial concentration of Au(III), pH values and electron donors affected nucleation of Au NPs by CNZ‐1, resulting in different apparent color of the as‐obtained bio‐Au NPs, which were further characterized by UV‐Vis, TEM, XRD, and XPS analyses. Mechanism studies revealed that Au(III) was first reduced to Au(I) and eventually reduced to EPS‐coated Au 0 NPs. FTIR and FEEM analyses revealed that some amides and humic acid‐like matters were involved in the production of bio‐Au NPs through CNZ‐1 cells. In addition, the authors also found that the catalytic activity of bio‐Au NPs for 4‐nitrophenol (4‐NP) reduction could be enhanced by various metal ions (Ca 2+ , Cu 2+ , Co 2+ , Fe 2+ , Fe 3+ , Ni 2+ , Sr 2+ , and Cr 3+ ) and metal oxides (Fe 3 O 4 , Al 2 O 3 , and SiO 2 ), which is beneficial for their further practical application. The maximum zero‐order rate constant k 1 and first‐order rate constant k 2 of all metal ions/oxides supplemented systems can reach 99.65 mg/(L . min) and 2.419 min −1 , which are 11.3‐ and 12.6‐fold higher than that of control systems, respectively. © 2018 American Institute of Chemical Engineers Biotechnol. Prog ., 35: e2727, 2019.