8.1.3 Co-doping Modification
In order to further improve the photocatalytic activity of TiO 2 and make effective use
of sunlight in visible light region, multicomponent modified TiO 2 such as co-doped
with different elements has attracted much more attention in the photocatalysis
fields. Some studies found that co-doped TiO 2 with appropriate elements could
exhibit a much higher photocatalytic activity than single-doped catalyst, because
of the existence of synergistic effect of doped elements which could promote the
visible light absorption and facilitate the separation efficiency of photo-formed
electrons and holes [11, 25, 35, 76, 77, 112, 116, 145, 146]. Herein, we will focus
on summary of the research status of the co-doping modification on TiO 2
Fig. 8.4 The top figure is the schematic diagram of the fluorination reaction that occurred in the
pore channels of MCF; the bottom figure is adsorption capacities of RhB (20 mg/L, catalyst
concentration: 0.25 g/L) on different samples (a); visible light photocatalytic activities of different
samples (b) (Reprinted with permission from ref. [50]. Copyright 2012, Elsevier)
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8 Modifications of Photocatalysts by Doping Methods