Influence of crystal facets and F-modification on the photocatalytic performance of anatase TiO2

Pure and F-modified anatase TiO2 with dominant (001) and (101) facets were synthesized under hydrothermal conditions, followed by treating in HF and NaOH solution. (001) facet exhibited higher activity than (101) facet in the photodegradation of rhodamine B (RhB) but showed lower activity in the photodegradation of methyl orange (MO). Meanwhile, F-modification on (001) facet promoted the RhB and MO degradation but F-modification on (101) facet decreased the activity in the MO degradation. Based on structural characterizations and kinetic studies, the above results were discussed by considering different active species for oxidizing RhB and MO.

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► F-modification affects differently the photocatalysis on (001) and (101) facets.
► F-modification inhibits the recombination between photoelectrons and holes.
► F-modification affects the yield of active species on (001) and (101) facets.
► Different active species dominates the photodegradation of different dyes.