Influence of activated carbon upon the photocatalytic degradation of methylene blue under UV–vis irradiation

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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