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        Sequential adsorption - photocatalytic oxidation process for wastewater treatment using a composite material TiO₂/activated carbon

        Caroline Andriantsiferana,Elham Farouk Mohamed,Henri Delmas 대한환경공학회 2015 Environmental Engineering Research Vol.20 No.2

        A composite material was tested to eliminate phenol in aqueous solution combining adsorption on activated carbon and photocatalysis with TiO₂ in two different ways. A first implementation involved a sequential process with a loop reactor. The aim was to reuse this material as adsorbent several times with in situ photocatalytic regeneration. This process alternated a step of adsorption in the dark and a step of photocatalytic oxidation under UV irradiation with or without H₂O₂. Without H₂O₂, the composite material was poorly regenerated due to the accumulation of phenol and intermediates in the solution and on TiO₂ particles. In presence of H₂O₂, the regeneration of the composite material was clearly enhanced. After five consecutive adsorption runs, the amount of eliminated phenol was twice the maximum adsorption capacity. The phenol degradation could be described by a pseudo first-order kinetic model where constants were much higher with H₂O₂ (about tenfold) due to additional .H radicals. The second implementation was in a continuous process as with a fixed bed reactor where adsorption and photocatalysis occurred simultaneously. The results were promising as a steady state was reached indicating stabilized behavior for both adsorption and photocatalysis.

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