Intensification of Dihydroxybenzenes Degradation over Immobilized TiO 2 Based Photocatalysts under Simulated Solar Light.

Featured Application: Solar photocatalysis is a promising technology of water purification for real scale applications. Intensification choices are readily available and mostly focused on optimal reactor design and/or effective photocatalyst formulation. Our study gives a simple methodology for the quantification of intensification potential, given that intensification indices are applicative in further research, simulations and predictions of degradation extents in various photocatalytic systems. The work is focused on the assessment of possible methods for intensification of photocatalytic degradation of common water borne pollutants. Solar photocatalysis poses certain limitations for large scale application with several possible reactor designs which have shown an optimal performance. In the current study, a comparison between two types of pilot scale reactors was made: a flat-plate cascade reactor (FPCR) and tubular reactor with a compound parabolic collector (CPC). Apart from the reactor design, another aspect of possible intensification was a photocatalyst formulation. The efficiency of photocatalytic films that consisted of pure TiO₂ nanoparticles was compared to the efficiency of films that consisted of TiO₂/CNT composites. Intensification assessment was performed via detailed kinetic modelling, combining the optical properties of films, irradiation conditions and reactor mass balance. Intensification was expressed via intensification indices. Results showed the advantage of the CPC-based reactor design and an unbiased effect of sensitizing agent (CNT) in the photocatalytic film formulation. [ABSTRACT FROM AUTHOR]