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Surface nano-aggregation and photocatalytic activity of TiO2 on H-type activated carbons
Authors:Tulynan Cordero  Jean-Marc Chovelon  Christian Duchamp  Corinne Ferronato  Juan Matos  
Affiliation:

aCentro de Química, Instituto Venezolano de Investigaciones Científicas (I.V.I.C.), Apartado 21827, Caracas 1020-A, Venezuela

bLaboratoire d’Application de la Chimie à l’Environnement (LACE, UMR CNRS 5634), Université Claude Bernard Lyon I, 43 Blvd. du 11 Novembre 1918, 69622 Villeurbanne Cédex, France

Abstract: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 °C up to 1000 °C 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.
Keywords:Photocatalysis  4-Chlorophenol  Titania  Activated carbon  Synergy
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