title: Methanobactin-mediated synthesis of gold nanoparticles supported over Al2O3 toward an efficient catalyst for glucose oxidation.
abstract: Methanobactin (Mb) is a copper-binding peptide that appears to function as an agent for copper sequestration and uptake in methanotrophs. Mb can also bind and reduce Au(III) to Au(0). In this paper, Au/Al2O3 catalysts prepared by a novel incipient wetness-Mb-mediated bioreduction method were used for glucose oxidation. The catalysts were characterized, and the analysis revealed that very small gold nanoparticles with a particle size <4 nm were prepared by the incipient wetness-Mb-mediated bioreduction method, even at 1.0% Au loading (w/w). The influence of Au loading, calcination temperature and calcination time on the specific activity of Au/Al2O3 catalysts was systematically investigated. Experimental results showed that decomposing the Mb molecules properly by calcinations can enhance the specific activity of Au/Al2O3 catalysts, though they acted as reductant and protective agents during the catalyst preparation. Au/Al2O3 catalysts synthesized by the method exhibited optimum specific activity under operational synthesis conditions of Au loading of 1.0 wt % and calcined at 450 °C for 2 h. The catalysts were reused eight times, without a significant decrease in specific activity. To our knowledge, this is the first attempt at the preparation of Au/Al2O3 catalysts by Mb-mediated in situ synthesis of gold nanoparticles.
authors.affiliation: Key Laboratory for Food Science & Engineering, Harbin University of Commerce, Harbin 150076, China. xinjy@hrbcu.edu.cn.
authors.forename: Jia-Ying
authors.initials: JY
authors.lastname: Xin
authors.affiliation: Key Laboratory for Food Science & Engineering, Harbin University of Commerce, Harbin 150076, China. glklkk@126.com.
authors.forename: Kai
authors.initials: K
authors.lastname: Lin
authors.affiliation: Key Laboratory for Food Science & Engineering, Harbin University of Commerce, Harbin 150076, China. wyan@hrbcu.edu.cn.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory for Oxo Synthesis & Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China. cgxia@licp.ac.cn.
authors.forename: Chun-Gu
authors.initials: CG
authors.lastname: Xia
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D002384:Catalysis; D003460:Crystallization; D005947:Glucose / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D009842:Oligopeptides / Q000737:chemistry*; D010084:Oxidation-Reduction; D056951:Photoelectron Spectroscopy; D059027:Recycling; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D007093:Imidazoles; D009842:Oligopeptides; C491147:methanobactin; D006046:Gold; D005947:Glucose; D000537:Aluminum Oxide