Recently, the use of photocatalysts to remove undesired organic or
inorganic pollutants has been widely studied [1–3]. The application of
TiO
has been extensively investigated due to its high stability, low
cost, abundance and non-toxic nature [4]. Nevertheless, the photocatalytic
activity of TiO
2
is constrained by two main factors: the
ability to absorb visible light and the fast recombination of
photogenerated electron and hole. Therefore, many studies have
devoted to the improvement of TiO
2
photocatalytic activity. It has
been reported that doping nitrogen and other non-metallic element
such as fluorine and carbon can shift the light absorption of TiO
2
to
visible-light region [5–7]. On the other hand, metal loaded on TiO
can
trap electrons to the surface, which retards the recombination of
electron and hole [8].
2
2
Recently, the use of photocatalysts to remove undesired organic orinorganic pollutants has been widely studied [1–3]. The application ofTiOhas been extensively investigated due to its high stability, lowcost, abundance and non-toxic nature [4]. Nevertheless, the photocatalyticactivity of TiO2is constrained by two main factors: theability to absorb visible light and the fast recombination ofphotogenerated electron and hole. Therefore, many studies havedevoted to the improvement of TiO2photocatalytic activity. It hasbeen reported that doping nitrogen and other non-metallic elementsuch as fluorine and carbon can shift the light absorption of TiO2tovisible-light region [5–7]. On the other hand, metal loaded on TiOcantrap electrons to the surface, which retards the recombination ofelectron and hole [8].22
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