论文部分内容阅读
Persulfate activation has been applied as one of the efficient advanced oxidation processes (AOPs) to remediate polluted environments.In this study,a novel α-FeOOH anchored by graphene oxide (GO)-carbon nanotubes (CNiTs) aerogel (α-FeOOH@GCA) nanocomposite activated persulfate system (α-FeOOH@GCA + K2S2O8) was applied for decolorization of Orange Ⅱ (OⅡl).The decolorization of OⅡ was remarkably enhanced to a level of ～ 99％ in this system compared with that of pristine α-FeOOH (～44％) or GO-CNTs (～ 18％).The enhanced catalytic activity of α-FeOOH@GCA was due to the formation of a heterojunction by α-FeOOH and GO-CNTs as confirmed by the presence of Fe-O-C chemical bonds.The degradation intermediates of OⅡ were comprehensively identified.The proposed degrada tion pathway of OⅡ begins with the destruction of the conjugated structures of OⅡ by the dominant reactive oxygen species,surface-bound SO*4-.The decolorization efficiency of OⅡ by the cα-FeOOH@GCA activated persulfate system decreased from the first to third cycle of recycling.Ultraviolet (UV) irradiation or introduction of a small amount of Fe2+ could restore the activation of this system.The results show that the α-FeOOH@GCA persulfate activation system promises to be a highly efficient environmental remediation method for organicpollutants.