Design guidelines for fixed-bed photocatalytic reactors

Alexiadis, Alessio; Mazzarino, Italo

doi:10.1016/j.cep.2004.06.009

Cited by 31 publications

(15 citation statements)

References 4 publications

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“…Among them, TiO 2 is the most widely used for its high photocatalytic activity, stability, non-toxicity and low price [2,5]. A wide literature on this subject proves that the UV-irradiated titania surface can generate highly oxidative electrical holes to decompose various organic compounds present in aqueous and gaseous streams at ambient temperature and pressure conditions [6].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic decomposition of direct red 16 and kinetics analysis in a conic body packed bed reactor with nanostructure titania coated Raschig rings

Saien

Asgari

Soleymani

et al. 2009

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Photocatalytic decomposition of direct red 16 and kinetics analysis in a conic body packed bed reactor with nanostructure titania coated Raschig rings

Saien

Asgari

Soleymani

et al. 2009

Chemical Engineering Journal

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“…While fixed-film titanium dioxide photocatalysis has been suggested as a very promising technology for water purification [1,2], many issues have hindered its application on a commercial scale [3,4]. The applicability of this technology on a large scale highly depends on the effective utilisation of the photocatalytic surface and the incident radiation flux obtained from either natural or artificial sources to destroy the organic pollutants present in the stream.…”

Section: Introductionmentioning

confidence: 99%

Optimal catalyst thickness in titanium dioxide fixed film reactors: Mathematical modelling and experimental validation

Vezzoli

Farrell

Baker

et al. 2013

Chemical Engineering Journal

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h i g h l i g h t sExperimental results show an optimal catalyst thickness for sprayed TiO 2 of 5 lm.Liquid-side and catalyst-side illumination produce different behaviour. Model for diffusion, advection and rate of reaction in porous media is proposed. First principle model shows very good agreement with experimental results. Results can be used for optimisation of large-scale reactors. a b s t r a c tThe use of immobilised TiO 2 for the purification of polluted water streams introduces the necessity to evaluate the effect of mechanisms such as the transport of pollutants from the bulk of the liquid to the catalyst surface and the transport phenomena inside the porous film. Experimental results of the effects of film thickness on the observed reaction rate for both liquid-side and support-side illumination are here compared with the predictions of a one-dimensional mathematical model of the porous photocatalytic slab. Good agreement was observed between the experimentally obtained photodegradation of phenol and its by-products, and the corresponding model predictions. The results have confirmed that an optimal catalyst thickness exists and, for the films employed here, is 5 lm. Furthermore, the modelling results have highlighted the fact that porosity, together with the intrinsic reaction kinetics are the parameters controlling the photocatalytic activity of the film. The former by influencing transport phenomena and light absorption characteristics, the latter by naturally dictating the rate of reaction.

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“…Worldwide studies on photocatalytic technology started in 1970 [1] and photocatalytic oxidation has been proposed for the first time in 1980 as an effective method for the treatment of toxic organic substances [2]. Extensive research has therefore focused on the enhancement of photocatalysis by modification of TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Treatment of recalcitrant organic pollutants in water by heterogeneous catalysis using a mixed material (TiO₂-diatomite of algeria)

Cherrak¹,

Hadjel

Benderdouche

et al. 2016

Desalination and Water Treatment

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A B S T R A C TThe aim of this work was to study the photocatalytic degradation of Methylene Blue and phenol by nano-particles coated on diatomite as a new nano-composite catalyst. Titanium dioxide (Degussa P25) was immobilized on diatomite powder at different compositions by a very simple and low cost technique. Diatomite powder (also called Kieselguhr) is an Algerian substance with a snow-white color and porosity greater than 72%. High porosity allowed the diatomite powder to float on the surface of water providing a means for the treatment process that enabled separation from water without any need for pumping as well as the exposure to solar radiation when supported beneath titanium dioxide (TiO 2 ) during photocatalysis. The morphology characterization of the prepared catalysts was carried out by X-ray diffraction analysis, scanning electron microscopy and infrared spectroscopy (IR). Photocatalytic activity was initially tested in a single reactor followed by pH, conductivity and absorbance analyses. Photocatalytic treatment of synthetically polluted water with Methylene Blue and phenol showed good performance for the two new nano-composites using immobilized TiO 2 on diatomite.

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Design guidelines for fixed-bed photocatalytic reactors

Cited by 31 publications

References 4 publications

Photocatalytic decomposition of direct red 16 and kinetics analysis in a conic body packed bed reactor with nanostructure titania coated Raschig rings

Photocatalytic decomposition of direct red 16 and kinetics analysis in a conic body packed bed reactor with nanostructure titania coated Raschig rings

Optimal catalyst thickness in titanium dioxide fixed film reactors: Mathematical modelling and experimental validation

Treatment of recalcitrant organic pollutants in water by heterogeneous catalysis using a mixed material (TiO₂-diatomite of algeria)

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Design guidelines for fixed-bed photocatalytic reactors

Cited by 31 publications

References 4 publications

Photocatalytic decomposition of direct red 16 and kinetics analysis in a conic body packed bed reactor with nanostructure titania coated Raschig rings

Photocatalytic decomposition of direct red 16 and kinetics analysis in a conic body packed bed reactor with nanostructure titania coated Raschig rings

Optimal catalyst thickness in titanium dioxide fixed film reactors: Mathematical modelling and experimental validation

Treatment of recalcitrant organic pollutants in water by heterogeneous catalysis using a mixed material (TiO2-diatomite of algeria)

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Product

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Treatment of recalcitrant organic pollutants in water by heterogeneous catalysis using a mixed material (TiO₂-diatomite of algeria)