The mineralization of aqueous POPs by using graphene/TiO2
composites was evaluated by monitoring the changes in TOC in
the reaction systems. Graphene/TiO2-0.86% was chosen as the
representative photocatalyst. From the result in Fig. S2, the mineralization
rates of aqueous POPs are slower than their degradation
rates. The results imply that some organic intermediates were produced
during aqueous POPs degradation. About 79.7% and 86.2%
of TOC disappeared in graphene/TiO2-0.86% after 10 h of simulated
sunlight irradiation for rhodamine B and norfloxacin degradation,
which indicates that most organic intermediates were decomposed
and that the mineralization of rhodamine B and norfloxacin
approached completion in simulated sunlight irradiation. However,
only about 36.8% of TOC disappeared in graphene/TiO2-0.86%
after 25 h of visible light irradiation for aldicarb degradation