Ftir Study On Effect Of Fenton'S Reagents On The Surface Of Multi-Walled Carbon Nanotubes

After purification pretreatment by heating in air and dilute HNO3, multi-walled carbon nanotubes (MWNTs) were treated with Fenton's reagents under different experimental conditions. The results of FTIR spectra confirmed that hydroxyl groups and carbonyl groups could be brought into the MWNTs after Fenton chemical treatment. Moreover, the absorption intensity of carbonyl groups become increasingly stronger along with prolonged time. When MWNTs were treated with Fenton's reagents, the following factors, molar ratio of H2O2 and Fe2+, pH value and reaction time, could affect the modification outcome of MWNTs. Experimental results indicated that when molar ratio of H2O2 and Fe2+ was maintained at 10 and pH value at 3 under acidic condition, more carbonyl groups could be produced on the MWNTs after the treatment was carried out for 10 h. In addition, according to formation mechanism of hydroxyl radical and FTIR spectral changes before and after treatment, the possible mechanism of reaction between Fenton's reagents and MWNTs was discussed. The possible mechanism showed that existence of hydroxyl groups and carbonyl groups could be viewed as the outcome of addition and oxidation reaction of electrophilic hydroxyl radical on unsaturated bonds on the sidewalls of MWNTs.