▎ 摘　　要

In this study, the performance Of graphene oxide (GO) in Ozonation process was kinetically evaluated using the modified R-ct concept since GO may act as initiator, promoter and inhibitor in ozone radical chain reaction. The applicability of the modified R-ct concept was demonstrated using different GO suspensions (GO alone, GO/TiO2, GO/Fe3O4, GO/TiO2/Fe3O4) in ozonation process. Results showed that ozone exposure and center dot OH exposure were found to be higher for GO/Fe3O4 and GO/TiO2/Fe3O4 compared to other GO suspensions, which was almost equivalent to O-3/H2O2 process. The determined initiation and inhibition rate constants of GO alone, were 1 fold higher than GO/Fe3O4 and GO/TiO2/Fe3O4, since the GO alone suspension possesses higher O-3 decomposition but lower organic degradation because that GO does not yield center dot OH. Moreover, GO/Fe3O4 suspension, along with natural organic matter (NOM), was proven to be helpful in degrading ibuprofen in ozonation process, but the effect was minimal when compared to O-3/H2O2 process. These results exhibited that the surface modified GO suspensions could be utilized as future alternative AOPs. (C) 2018 Elsevier Ltd. All rights reserved.