title: Facile synthesis of Fe(3)O(4)/MWCNTs by spontaneous redox and their catalytic performance.
abstract: Fe(3)O(4) nanoparticles with a size range of 4-8 nm were formed by the spontaneous redox reaction between Fe(3 + ) and multi-walled carbon nanotubes (MWCNTs). Cyclic voltammetry, Raman spectroscopy and x-ray photoelectron spectroscopy were employed to study the thermodynamic and dynamic conditions for the Fe(3)O(4)/MWCNTs formation. It is found that the high defect density of MWCNTs was thermodynamically favorable for the spontaneous reduction of Fe(3 + ) ions and a reaction time of above 2.5 h should be guaranteed. As the catalysts for benzene hydroxylation to phenol, the as-obtained Fe(3)O(4)/MWCNTs exhibit superior catalytic performance to those prepared by the hydrothermal method. Therefore, the spontaneous redox between the Fe(3 + ) and MWCNTs supplies an attractive facile route for the preparation of Fe(3)O(4) nanoscale catalysts.
authors.affiliation: Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Shaoqing
authors.initials: S
authors.lastname: Song
authors.forename: Richuan
authors.initials: R
authors.lastname: Rao
authors.forename: Hongxiao
authors.initials: H
authors.lastname: Yang
authors.forename: Huade
authors.initials: H
authors.lastname: Liu
authors.forename: Aimin
authors.initials: A
authors.lastname: Zhang
mesh_terms: D004563:Electrochemistry; D005290:Ferric Compounds / Q000737:chemistry; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D010316:Particle Size; D056951:Photoelectron Spectroscopy; D013059:Spectrum Analysis, Raman; D013816:Thermodynamics
chemical_list: D005290:Ferric Compounds; D005296:Ferrous Compounds; D037742:Nanotubes, Carbon; C000499:ferric oxide; C034236:ferrous oxide; D052203:Ferrosoferric Oxide