title: In situ preparation, characterization, magnetic and catalytic studies of surfactant free RGO/Fe(x)Co(100-x) nanocomposites.
abstract: A novel, "wet" and "clean" methodology was developed to prepare Fe(x)Co(100-x) nanoparticles on reduced graphene oxide (RGO) surfaces in an aqueous solution through a coreduction process. Without any surface treatment, Fe(x)Co(100-x) nanoparticles can in situ grow on the RGO sheets. It was found that RGO nanosheets can effectively prevent the aggregation of Fe(x)Co(100-x) nanoparticles. The results reveal that the RGO/Fe(x)Co(100-x) nanocomposites have ferromagnetic characteristics and show composition dependent magnetic properties. The effectiveness of the as-prepared RGO/Fe(x)Co(100-x) nanocomposites as solid phase heterogeneous catalysts have been evaluated, for the first time, on the well-known 4-nitrophenol (4-NP) reduction to 4-aminophenol (4-AP) in the presence of excess sodium borohydride. The effect of initial 4-NP concentration, and catalyst loading dose were evaluated. The catalyst efficiency was examined on the basis of turnover frequency (TOF) and recyclability. The RGO/Fe25Co75 nanocomposites exhibit good catalytic activity toward 4-nitrophenol (4-NP) reduction and the graphene oxide (GO) supports also enhance the catalytic activity via a synergistic effect. The as-prepared RGO/Fe(x)Co(100-x) nanocomposite catalysts are very efficient, stable, easy to prepare, eco-friendly, cost-effective, and have potential industrial applications.
authors: State Key Laboratory of Applied Organic Chemistry and Colleague of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, PR China. chenfj@lzu.edu.cn
authors: Fengjuan
authors: F
authors: Chen
authors: Pinxian
authors: P
authors: Xi
authors: Cai
authors: C
authors: Ma
authors: Changwei
authors: C
authors: Shao
authors: Jun
authors: J
authors: Wang
authors: Shuai
authors: S
authors: Wang
authors: Guozhen
authors: G
authors: Liu
authors: ZhengZhi
authors: Z
authors: Zeng
mesh_terms: D000627:Aminophenols / Q000737:chemistry; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D059346:Magnets / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology; D009596:Nitrophenols / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*
chemical_list: D000627:Aminophenols; D009596:Nitrophenols; D010087:Oxides; D003035:Cobalt; D006108:Graphite; D007501:Iron; C026729:4-aminophenol; C024836:4-nitrophenol