Influence of activated carbon upon the photocatalytic degradation of methylene blue under UV–vis irradiation
2015
Photodegradation of methylene blue (MB) was studied on TiO₂in the presence of activated carbon (AC) prepared from the sawdust of a soft wood by physical activation under CO₂flow, by pyrolysis under N₂flow, and by chemical activation with ZnCl₂and H₃PO₄under N₂flow. MB photodegradation was performed under UV and UV-visible irradiation to verify the scaling-up of the present TiO₂-AC binary materials. It was verified that oxygenated surface groups on carbon were intrinsically photoactive, and a synergy effect between both solids has been estimated from the first-order apparent rate constants in the photodegradation of MB. This effect enhances the photoactivity of TiO₂up to a factor of about 9 under visible irradiation, and it was associated to the surface properties of AC.
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