Photocatalytic intrinsic reaction kinetics I: Mineralization of dichloroacetic acid

Zalazar, Cristina Susana; Romero, Roberto L.; Martín, Carlos Alberto; Cassano, Alberto E.

doi:10.1016/j.ces.2005.04.050

Cited by 57 publications

(70 citation statements)

References 28 publications

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“…The obtained value using potentiometric titration for ZPC of TiO 2 -P25 was 6.8. This value is very similar to the reported one in literature 6.6 (Zalazar et al, 2005). The protonic affinity constant estimated at this pH value was 1.25893x10 -7 .…”

Section: Potentiometric Titration and Zpcsupporting

confidence: 80%

“…Most of heterogeneous photocatalysis kinetic models do not consider the molecular adsorption as a rate-limiting stage; different semi-empirical kinetic models describe adequately photocatalytic degradation of organic pollutants have been proposed (Ollis & Turchi, 1990;Sawage et al, 2010;Satuf et al, 2008 andZalazar et al, 2005;Ballari et al, 2009;Cabrera et al, 1997;Alfano et al, 1997;Monllor et al, 2007), however these do not consider adsorption mechanism in the mathematical structures. Some researchers have reported that photooxidation reactions follow a classical Langmuir-Hinshelwood mechanism, assuming implicit adsorption/desorption equilibrium, not only in the dark phase but also in the lighted (photoreaction) stage (Friedmann et al, 2010, Herrmann, 2010Sawage et al, 2010;Alfano et al, 1997;Monllor et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Modelo de adsorción molecular para compuestos orgánicos sobre TiO2 – P25 mediante el método de afinidad protónica

Mueses

Machuca-Martínez²

2013

inycomp

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A predictive molecular adsorption model for organic compounds over TiO 2 -P25 particles was formulated. The model is an extension of a theoretical method of surface characterization called Protonic Distribution Affinity (PDA), which is obtained from potentiometric titration analysis, zero point charge (ZPC) of the material and adsorption isotherms of the Langmuir-Hinshelwood type. The chemical nature of the compound in the model was established by initial pH and molecular weigh. We found that, for the TiO 2 -P25, the ZPC was 6.8. The model was validated using experimental data of dichloroacetic acid (DCA), 4-chlorophenol (4-CP) and phenol (PH) to different conditions. The model has high predictive capacity, numerical stability and sturdiness for obtaining the solutions. For available experimental data, the correlation coefficient was 0.97. Keywords: Photocatalysis, protonic distribution affinity, Langmuir-Hinshelwood isotherm, potentiometric titration. ResumenUn modelo predictivo para adsorción molecular de componentes orgánicos sobre partículas de TiO 2 -P25, fue formulado. El modelo es una extensión de un método teórico de caracterización de superficies denominado Método de distribución de Afinidad Protónica (PDA), el cual se obtiene a partir del análisis de datos de titulación potenciométrica, ZPC del material e isotermas adsorción del tipo Langmuir-Hinshelwood. La naturaleza química del componente en el modelo es establecida por el pH inicial y su peso molecular. Se encontró que para el TiO2-P25 el ZPC es 6.8. El modelo fue validado con datos experimentales de ácido dicloroacético (DCA), 4-clorofenol (4-CP) y fenol (PH) a diferentes condiciones de operación. Se encontró que el modelo tiene alta capacidad predictiva, estabilidad numérica y robustez en la obtención de las soluciones. Para los datos experimentales disponibles, el coeficiente de correlación fue de 0.97.

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Section: Potentiometric Titration and Zpcsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Modelo de adsorción molecular para compuestos orgánicos sobre TiO2 – P25 mediante el método de afinidad protónica

Mueses

Machuca-Martínez²

2013

inycomp

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“…The direct and indirect relationship of the radiation field with the redox reaction kinetics is associated through the definition of the quantum yield of the photocatalytic reaction (the photon activation step of the semiconductor), and through the distribution of the local volumetric rate of photon absorption (LVRPA) [10][11][12][13][14]. Current efforts in mathematical modeling are centered in an adequate description of the LVRPA to facilitate the prediction of the experimental data on the heterogeneous photocatalytic degradation of contaminants in a fluid.…”

Section: Introductionmentioning

confidence: 99%

“…2) using the Discrete Ordinate Method (DOM) proposed by Duderstadt and Martin [10,15]. This method has been applied to plane photoreactor geometries [11,15,17], tubular photoreactors [10,13,18,19], and compound parabolic collectors (CPC) reactors [11,12,[20][21][22] using monochromatic and polychromatic irradiation sources and at steady state.…”

Section: Introductionmentioning

confidence: 99%

Effective radiation field model to scattering – Absorption applied in heterogeneous photocatalytic reactors

Mueses

Martínez

Hernández‐Ramírez

et al. 2015

Chemical Engineering Journal

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Abstract:A new mathematical model for the calculation of the radiation field in heterogeneous photocatalytic reactors using the new concept of "Effective radiation field model" or ERFM is proposed. In this concept, the incident radiation associated to the photons flow is an energy cloud. The generated space-phase and the properties of the cloud are considered to be isotropic and independent of the propagation angle and photon frequency. The isotropic nature of the ERFM concept provides a simpler estimation of the radiation field of a photocatalyst suspension (particles and fluid) for polychromatic radiation spectra such as the solar spectrum.The ERFM is an alternative for the calculus of the spatial distribution of the radiant energy in heterogeneous photocatalytic reactors as an extension of the concept associated to the overall volumetric rate photon absorption -OVRPA. The local volumetric rate of photon absorption (LVRPA) predicted by the ERFM were compared with the predictons from the Six Flux Model (SFM) and the rigorous solution of the radiative transfer equation (RTE).The LVRPA calculated with the ERFM was found to be closer to the solution of the RTE by the Discrete Ordinate Method (DOM). This was attributed to the isotropic phase function which was adopted in both models (ERFM and RTE-DOM).

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“…Zalazar ve ark. [44,45] askıda sistem fotokimyasal reaksiyonlar için bağımsız kinetik parametrelerin eldesi yaklaşımını; öncelikle kinetik parametrelerin belirlenebilmesi amacıyla işletme koşulları ve geometrisi çok iyi bilinen bir deneysel reaktör (ideal piston akış veya mükemmel karışım sağlanan koşullar), basit bir izleyen-reaksiyonlar denklemi, kütle dengesi ve reaktörün herhangi bir noktasında oluşan ışık alanının matematiksel ifadesi üzerine kurmuştur.…”

Section: Anti̇bi̇yoti̇k Ve Anti̇bi̇yoti̇klere Di̇rençli̇ Bakteri̇leri̇n Fotokatunclassified

Anti̇bi̇yoti̇k Ve Anti̇bi̇yoti̇klere Di̇rençli̇ Bakteri̇leri̇n Fotokatali̇z Prosesi̇ İle Gi̇deri̇mi̇ni̇n Değerlendi̇ri̇lmesi̇

Özkal¹,

Pagano²

2016

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZSu kaynaklarında sıklıkla rastlanan mikrokirleticilerin, alıcı ortamdaki çevresel etkileri ve mevcut arıtma sistemleri ile etkin giderilememeleri sebebiyle gelecek yıllarda yasal sınırlamaların hedefi olması beklenmektedir. Özellikle farmasötikler ve geniş kullanım alanına sahip antibiyotikler, hem üretimleri, hem de tüketimleri sonrasında çevreye salınmakta ve alıcı ortamı tehdit etmektedir. Biyolojik arıtma sistemleri başta olmak üzere konvansiyonel arıtma proseslerinin, antibiyotiklerin gideriminde yetersiz kaldığı görülmektedir. Antibiyotiklerin biyolojik olarak bozunmaya dirençli yapısı oksidasyon potansiyeli yüksek olan ileri oksidasyon proseslerinin kullanımını gerektirmektedir. Fotokataliz prosesleri, eko-toksik etkisinin minimum düzeyde olması ve antibiyotikleri mineralize edebilme potansiyeli ile önemli bir detoksifikasyon prosesidir. Ayrıca prosesin güneş enerjisi ile işletilebilir olması, deneysel çalışma ve pilot ölçekli uygulamalara olan ilgiyi arttırmaktadır. Bu çalışma ile literatürde askıda sistem ve yüzeyde sabitlenme prensibine göre yürütülmekte olan fotokataliz prosesi çalışmalarının temel prensip ve mekanizmaları, antibiyotik giderimi ve bakteri inaktivasyonu açısından değerlendirilmektedir. Proses parametrelerinin, büyük ölçekli uygulamaların yaygınlaşması ve prosesin modellenmesi hedeflerine uygun olarak ele alınması üzerinde durulmuştur. Anahtar Kelimeler: Antibiyotik giderimi, bakteri inaktivasyonu, fotokataliz EVALUATION OF ANTIBIOTICS AND ANTIBIOTIC RESISTANT BACTERIA REMOVAL BY PHOTO-CATALYSIS ABSTRACTMicro-pollutants are one of the most commonly encountered pollutants in water resources. Because of environmental impacts and insufficient rates of removal at the prevalent treatment plant, they involve the most specific pollutants that will be the target of future legislations. Following their production and consumption, releases of effluents pose a threat to the receiving environment. Conventional but most essentially of biological treatment plants, are mostly ineffective for removal of antibiotics. Advanced oxidation processes with their high oxidation potentials have the utmost potential for total mineralization of antibiotics that have non-biodegradable structure. Photo-catalysis is superior with its process mechanism causing relatively lower eco-toxicity and able to provide total mineralization and may be nominated as a detoxification process option. Since photo-catalysis has potential to be operated under solar irradiation, there is growing interest in both laboratory scale experiments and pilot scale applications.

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Photocatalytic intrinsic reaction kinetics I: Mineralization of dichloroacetic acid

Cited by 57 publications

References 28 publications

Modelo de adsorción molecular para compuestos orgánicos sobre TiO2 – P25 mediante el método de afinidad protónica

Modelo de adsorción molecular para compuestos orgánicos sobre TiO2 – P25 mediante el método de afinidad protónica

Effective radiation field model to scattering – Absorption applied in heterogeneous photocatalytic reactors

Anti̇bi̇yoti̇k Ve Anti̇bi̇yoti̇klere Di̇rençli̇ Bakteri̇leri̇n Fotokatali̇z Prosesi̇ İle Gi̇deri̇mi̇ni̇n Değerlendi̇ri̇lmesi̇

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