关键词: 多壁炭纳米管, 氧化铁, 催化湿法氧化, 过氧化氢, 苯酚

Abstract:

Multiwelled carbon nanotube supported iron oxide(Fe2O3/CNT) as catalyst for the oxidation of phenol in waste water by hydrogen peroxide was studied. The catalysts samples was synthesized by a chemical precipitation in the presence or absence of polyvinyl alcohol(PVA) and followed by a heat treatment. X-ray diffraction(XRD) result revealed two crystalline (α-type and γ-type) iron oxide were presented in the catalyst. The content of the active metal oxide component on the CNT was about 15.1%. The catalytic performance were carried out in a glass vessel in a batch operation mode at atmospheric pressure and temperature ranging from 50 ℃ to 90 ℃. At a temperature of 80 ℃, initial phenol concentration of 350 mg/L, hydrogen peroxide 1 500 mg/L and catalysts 1.0 g/L, the phenol conversion and the COD removal rate of the water were 100% and 86.1%, respectively, after 240 min oxidation. The influence of using PVA in the process of catalysts preparation on their catalytic performance was discussed.

Key words: Multi-welled carbon nanotubes, Iron oxide, Catalytic Wet Oxidation, Peroxide, Phenol