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Article Dans Une Revue Applied Catalysis B: Environmental Année : 2007

Surface nano-aggregation and photocatalytic activity of TiO2 on H-type activated carbons

Résumé

The main objective of this work is to detect any associative or synergistic effects between TiO2 and activated carbon in 4-chlorophenol photodegradation. Different activated carbons (AC) were prepared from Tabebuia pentaphyla wood by means of physical activation with CO2 or by extensive carbonization under N2 flow at temperatures from 450 8C up to 1000 8C during 1 h. Results indicate a clear correlation between photocatalytic activities of titania with texture and surface chemistry of AC. Kinetic results of 4-chlorophenol photodegradation indicate that for most of mixed TiO2 and AC solids a synergistic effect between both solids is observed. Surface nano-aggregation of TiO2 on AC was observed by scanning electronic microscopy and dispersion of TiO2 nanoparticles was improved as a function of more basic surface pH of AC. In conclusion, an increase of electronic density in carbon support clearly introduces an enhancement in titania's photoactivity for 4CP photodegradation. This beneficial effect indicates that it is possible to obtain clean water in a much shorter period of time by employing some selected AC in conjunction with TiO2.

Dates et versions

hal-00131374 , version 1 (16-02-2007)

Identifiants

Citer

Tulynan Cordero, Jean-Marc Chovelon, Corinne Ferronato, Juan Matos. Surface nano-aggregation and photocatalytic activity of TiO2 on H-type activated carbons. Applied Catalysis B: Environmental, 2007, 73, pp.227-235. ⟨10.1016/j.apcatb.2006.10.012⟩. ⟨hal-00131374⟩
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