Abstract
With popular application of multi-walled carbon nanotubes (MWCNTs), they have been discharged into water. MWCNTs and their derivatives may harm organs, cells and organisms. Therefore, development of an efficient method for removing MWCNTs and their derivatives from water is important. Under UV–light irradiation, MWCNTs can be oxidized by oxygen in air to give oxidized MWCNTs (O-MWCNTs), therefore, degradation of O-MWCNTs is a vital step for removal of MWCNTs and their derivatives from water. In this paper, O-MWCNTs were degraded via photo-Fenton method to give CO2 and water after 168h. Degradation process was detected by total organic carbon and ultraviolet–visible absorption spectra. Degradation intermediates were supposed based on nuclear magnetic resonance, liquid chromatography-tandem mass, Raman, fourier transform infrared spectra and elemental analysis data. In order to develop an efficient degradation method for removing O-MWCNTs from water, photodegradation mechanism of O-MWCNTs was suggested.
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