title: Influence of the different oxidation treatment on the performance of multi-walled carbon nanotubes in the catalytic wet air oxidation of phenol.
abstract: Multi-walled carbon nanotubes (MWCNTs) functionalized by different oxidants (HNO(3)/H(2)SO(4), H(2)O(2), O(3) and air) have been used as catalysts for the wet air oxidation of phenol. To investigate the effect of the oxidation conditions on the structure of the functionalized MWCNTs, various characterization techniques, e.g., scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, Fourier-transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) have been used. The MWCNTs treated with O(3) and H(2)O(2) show higher amounts of oxygen-containing functional groups and carboxylic acid groups, and a weaker acidic nature, in comparison with those treated with other oxidizing agents. All the functionalized MWCNTs exhibit good activity in the catalytic wet air oxidation (CWAO) of phenol. However, the MWCNTs treated with O(3) show the highest activity with desirable stability in comparison with other functionalized MWCNTs, indicating that the functionalization of carbon nanotubes with O(3) is a very promising strategy in synthesizing efficient catalysts for CWAO.
authors: National Engineering Laboratory for Biomass Power Generation Equipment, School of Renewable Energy, North China Electric Power University, Beijing 102206, China. sx-yang@mail.tsinghua.edu.cn
authors: Shaoxia
authors: S
authors: Yang
authors: Xingang
authors: X
authors: Wang
authors: Hongwei
authors: H
authors: Yang
authors: Yu
authors: Y
authors: Sun
authors: Yunxia
authors: Y
authors: Liu
mesh_terms: D000388:Air; D002384:Catalysis; D006861:Hydrogen Peroxide / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D017942:Nitric Acid / Q000737:chemistry; D016877:Oxidants / Q000737:chemistry*; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D019800:Phenol / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D037742:Nanotubes, Carbon; D016877:Oxidants; D013464:Sulfuric Acids; D014874:Water Pollutants, Chemical; D019800:Phenol; D017942:Nitric Acid; D010126:Ozone; D006861:Hydrogen Peroxide; C033158:sulfuric acid