α-Fe 2 O 3 /GO composites with a serious gradient ratio of GO to α-Fe 2 O 3 (0.1%,
1.0%, 2.0%, 5.0%, and 8.0%, respectively), comparing with the pure α-Fe 2 O 3
nanoplates. As Fig. 10.3a shows, the absorption peak at 550 nm decreased in
intensity as the time prolonged. And compared to pure α-Fe 2 O 3 , the value of c/c 0
decreased faster within a certain period of time when the ratio of GO increased and
the composite with 5.0 wt.% of GO had the best catalytic performance shown in
Fig. 10.3b and 3c, respectively. As a result, the degradation rate constant of the
composite with the optimal ratio of 5 wt% graphene was almost four times faster
than the pure α-Fe 2 O 3 nanoplates and 98% of Rhodamine (RhB) was decomposed
with 20 min of irradiation (Fig. 10.3d).
Moreover, the structure and the morphology of the graphene also affect the
photocatalytic activity of the composites. A composite of α-Fe 2 O 3 and graphene
with N-doping has exhibited higher photocatalytic efficiency. Liu et al. [53] have
reported a pyrrolic N-doped graphene oxide/Fe 2 O 3 mesocrystal (NG-Fe 2 O 3 )
Fig. 10.2 XRD patterns (a), TEM image of GO-Fe 2 O 3 (b), NG-Fe 2 O 3 (c) and HRTEM image of
NG-Fe 2 O 3 (d). Reprinted with permission from ref. [50]. Copyright 2017, Elsevier
246
10 Heterogeneous Photo-Fenton Technology
1.0%, 2.0%, 5.0%, and 8.0%, respectively), comparing with the pure α-Fe 2 O 3
nanoplates. As Fig. 10.3a shows, the absorption peak at 550 nm decreased in
intensity as the time prolonged. And compared to pure α-Fe 2 O 3 , the value of c/c 0
decreased faster within a certain period of time when the ratio of GO increased and
the composite with 5.0 wt.% of GO had the best catalytic performance shown in
Fig. 10.3b and 3c, respectively. As a result, the degradation rate constant of the
composite with the optimal ratio of 5 wt% graphene was almost four times faster
than the pure α-Fe 2 O 3 nanoplates and 98% of Rhodamine (RhB) was decomposed
with 20 min of irradiation (Fig. 10.3d).
Moreover, the structure and the morphology of the graphene also affect the
photocatalytic activity of the composites. A composite of α-Fe 2 O 3 and graphene
with N-doping has exhibited higher photocatalytic efficiency. Liu et al. [53] have
reported a pyrrolic N-doped graphene oxide/Fe 2 O 3 mesocrystal (NG-Fe 2 O 3 )
Fig. 10.2 XRD patterns (a), TEM image of GO-Fe 2 O 3 (b), NG-Fe 2 O 3 (c) and HRTEM image of
NG-Fe 2 O 3 (d). Reprinted with permission from ref. [50]. Copyright 2017, Elsevier
246
10 Heterogeneous Photo-Fenton Technology