Figure 7.

Under UV-light irradiation, the EPR curves (DMPO-${\mathrm{OH}}^{·}$) of TiO₂ and the graphene-TiO₂ composite photocatalyst (a–d), under visible light irradiation, the EPR curves of pure TNTs and graphene-TNTs composite photocatalysts (e) DMPO-${\mathrm{OH}}^{·}$ and (f) DMPO-${\mathrm{O}}_2^{-}$. Figure 7a Reproduced with permission form [133]. Copyright Elsevier, 2016. Figure 7b Reproduced with permission form [134]. Copyright Elsevier, 2012. Figure 7c Reproduced with permission form [135]. Copyright Elsevier, 2016. Figure 7d Reproduced with permission form [139]. Copyright Elsevier, 2014. Figure 7e,f Reproduced with permission form [14]. Copyright Elsevier, 2013.