Naslov
Modeling the decomposition of oxalic acid in multiple photocatalytic reactors

Autori
Grčić, Ivana ; Li Puma, Gianluca

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
3rd European Conference on Environmental Applications of Advanced Oxidation Processes (EAAOP3) / - , 2013, 1-1

Skup
3rd European Conference on Environmental Applications of Advanced Oxidation Processes (EAAOP3)

Mjesto i datum
Almería, Španjolska, 27.10.2013. - 30.10.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
photocatalysis; modeling; oxalic acid

Sažetak
The vast literature on photocatalytic oxidation of water pollutants reports too often reaction kinetics constants, which are not independent from the type of photoreactor and experimental conditions used. This study addresses this problematic aspect by demonstrating a general and simple methodology for the evaluation of “intrinsic” reaction kinetic constants of photocatalytic degradation of water contaminants, which are truly independent of reactor type, catalyst concentration, irradiance levels and hydrodynamic conditions. A detailed kinetic model for the adsorption and photodecomposition of oxalic acid on titanium dioxide (TiO2) aqueous suspensions was combined with a validated radiation model to validate the proposed general methodology. The degradation of oxalic acid was followed in two annular photoreactors (PR1 and PR2) that differ in geometry (i.e., diameter and optical thicknesses) which were operated under different hydrodynamic regimes (turbulent batch mode and laminar, flow-through recirculation mode) catalyst concentrations and photon irradiances. The photon absorption, at each position in the photoreactor (local volumetric rate of photon absorption or LVRPA) was evaluated by the six-flux radiation absorption-scattering model (SFM) and further used to determine local reaction rates and the intrinsic reaction kinetics constants. The model predictions followed the trend of experimental data for oxalic acid oxidation in both PR1 and PR2 validating the proposed method. The modeling approach shown provides a method for the determination of more meaningful reaction kinetic constants of photocatalytic degradation of water contaminants.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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