4.2.2. Isopropanol oxidationUV–Vis

4.2.2. Isopropanol oxidationUV–Vis photocatalytic activity results of the samples against the removal of IPA, shown as FQE and formation rates of acetone(ppm.h−1), are summarised in Fig. 9a,b. Consistent with the data obtained with the NOx abatement and benzene removal (cf Section 4.1,and Section 4.2.1), addition of graphene to TiO2 aided the photocatalytic assisted IPA oxidation. This is shown by FQEs values (Fig. 9a):pure TiO2 at 250 °C / 8 h (Ti250) showed an FQE acetone formationrate of 1.8 × 10–2 molecules.photon–1. Upon hybridisation with 0.5 and1.0 wt% graphene, the FQE acetone formation rate increased to 2.9 and 2.6 × 10–2 molecules.photon–1 (G0.5/250 and G1.0/250, Fig. 9a).This is also displayed by acetone formation rates of 210, 330, and295 ppm.h−1 for Ti250, G0.5/250 and G1.0/250, respectively,Fig. 9b).