Department of Civil and Environmental Engineering, Faculty of Engineering, National University of Singapore, 1 Engineering Drive 2, 117576, Singapore.
Department of Civil and Environmental Engineering, Faculty of Engineering, National University of Singapore, 1 Engineering Drive 2, 117576, Singapore.
Water Res. 2018 May 1;134:63-73. doi: 10.1016/j.watres.2018.01.033. Epub 2018 Feb 5.
In this study, the performance of graphene oxide (GO) in ozonation process was kinetically evaluated using the modified R concept since GO may act as initiator, promoter and inhibitor in ozone radical chain reaction. The applicability of the modified R concept was demonstrated using different GO suspensions (GO alone, GO/TiO, GO/FeO, GO/TiO/FeO) in ozonation process. Results showed that ozone exposure and •OH exposure were found to be higher for GO/FeO and GO/TiO/FeO compared to other GO suspensions, which was almost equivalent to O/HO process. The determined initiation and inhibition rate constants of GO alone, were 1 fold higher than GO/FeO and GO/TiO/FeO, since the GO alone suspension possesses higher O decomposition but lower organic degradation because that GO does not yield •OH. Moreover, GO/FeO 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/HO process. These results exhibited that the surface modified GO suspensions could be utilized as future alternative AOPs.
在这项研究中，使用改进的 R 概念来评估氧化石墨烯（GO）在臭氧氧化过程中的性能，因为 GO 可能在臭氧自由基链式反应中充当引发剂、促进剂和抑制剂。通过在臭氧氧化过程中使用不同的 GO 悬浮液（单独的 GO、GO/TiO、GO/FeO、GO/TiO/FeO），证明了改进的 R 概念的适用性。结果表明，与其他 GO 悬浮液相比，GO/FeO 和 GO/TiO/FeO 的臭氧暴露和•OH 暴露更高，几乎相当于 O/HO 过程。单独的 GO 的确定引发和抑制速率常数比 GO/FeO 和 GO/TiO/FeO 高 1 倍，因为单独的 GO 悬浮液具有更高的 O 分解但由于 GO 不会产生•OH，因此有机降解较低。此外，GO/FeO 悬浮液与天然有机物（NOM）一起被证明有助于在臭氧氧化过程中降解布洛芬，但与 O/HO 过程相比，效果最小。这些结果表明，表面改性的 GO 悬浮液可用作未来的替代 AOPs。
