Determination of Quantum Yield in a Heterogeneous Photocatalytic System Using a Fitting-Parameters Model

Machuca, Fiderman; Colina–Márquez, José; Mueses, Miguel Ángel

doi:10.1515/jaots-2008-0105

Cited by 8 publications

(10 citation statements)

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“…The determination of photonic flux was carried out using chemical actinometry [20,21] The quantum yield was estimated using the equation reported previously [22,23] for heterogeneous photocatalytic systems (Equation 1):…”

Section: Catalytic Activitymentioning

confidence: 99%

A kinetic study of the photoinduced oxo-transfer using a Mo complex anchored to TiO2

Sánchez-Velandia

Páez‐Mozo

Ortega

2020

redin

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Kinetic study of the photo-assisted oxygen atom transfer reaction (OAT) using a dioxo-Mo complex anchored on TiO2, stimulated by light, was performed at ambient conditions using triphenylphosphine (PPh3) as a model molecule. The kinetic of the OAT reaction was studied with three catalytic systems: 4,4’-dicarboxylate-2,2’-bipyridine-dioxochloromolybdenum (MoO2L/TiO2), H2MoO4 (H2MoO4/TiO2) and molybdenum oxide (MoO3/ TiO2) anchored to TiO2. The MoO2L/TiO2 gives conversion higher than 90% and selectivity (to phosphine oxide) close to 100%. MoO3/TiO2 did not allow the oxo-transference, suggesting the importance of the bipyridine ligand as an electronic connector between MoO2L unit and TiO2. With the MoO2L/TiO2 system was observed that when the photonic flux increases, the quantum yield, and the OAT reaction rate increases.

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Section: Catalytic Activitymentioning

confidence: 99%

A kinetic study of the photoinduced oxo-transfer using a Mo complex anchored to TiO2

Sánchez-Velandia

Páez‐Mozo

Ortega

2020

redin

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“…Para analizar el efecto de la concentración inicial de DCA y la carga de catalizador se tomó como punto de comparación el porcentaje de fotodegradación de DCA a una energía UV acumulada igual a 25 W•h/m 2 (véase Tabla 2). Las concentraciones iníciales de DCA definidas en 30, 60, 120 ppm y las cargas iníciales de catalizador establecidas en 0.1, 0.5, 1 g/L, fueron normalizadas y definidas como x1 y x2, respectivamente, antes de iniciar el análisis estadístico, utilizando las ecuaciones (4 a 7) (Machuca-Martínez et al, 2008).…”

Section: Análisis Del Efecto De La Concentración Inicial De Dca Y La unclassified

Degradación Fotocatalítica Solar Heterogénea de Ácido Dicloroacético en un Reactor Placa Plana a Escala Piloto

2019

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La fotodegradación heterogénea solar de ácido dicloroacético (DCA) en un reactor placa plana a escala piloto, con los efectos de concentración inicial de sustrato y carga de catalizador TiO2-P25 fue evaluada. El análisis cinético mostró que la degradación de DCA es controlada por los efectos del proceso fotocatalítico solamente. Además, la concentración inicial del sustrato y la carga de catalizador afectan favorablemente el proceso. No se presentaron degradaciones por fotólisis directa y la adsorción molecular no afectó el desempeño. El seguimiento se llevó usando TOC y ion cloruro. Se obtuvieron conversiones entre 60% y 90% confirmando la efectividad del tratamiento. Las técnicas de seguimiento de TOC y cloruros (Cl-) mostraron la ausencia de intermediarios de reacción. El modelo matemático propuesto garantizó la predicción de los datos experimentales con un coeficiente de correlación de 0.92 y un error medio global de 2.3%.

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“…This is because varies with the reactor geometry, radiation source, and operational conditions. This implies that the expression is not useful neither for comparison between reaction devices nor scaling [20].…”

Section: Modelling Of Degradation Kineticsmentioning

confidence: 99%

Mixing Rules Formulation for a Kinetic Model of the Langmuir-Hinshelwood Semipredictive Type Applied to the Heterogeneous Photocatalytic Degradation of Multicomponent Mixtures

Rodriguez-Acosta

Mueses

Machuca-Martínez

2014

International Journal of Photoenergy

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Mixing rules coupled to a semipredictive kinetic model of the Langmuir-Hinshelwood type were proposed to determine the behavior of the heterogeneous solar photodegradation with TiO 2 -P25 of multicomponent mixtures at pilot scale. The kinetic expressions were expressed in terms of the effective concentration of total organic carbon ( TOC ). An expression was obtained in a generalized form which is a function of the mixing rules as a product of a global contribution of the reaction rate constant and a mixing function ( ). Kinetic parameters of the model were obtained using the Nelder and Mead (N-M) algorithm. The kinetic model was validated with experimental data obtained from the degradation of binary mixtures of chlorinated compounds (DCA: dichloroacetic acid and 4-CP: 4-chlorophenol) at different initial global concentration, using a CPC reactor at pilot scale. A simplex-lattice {2,3} design experiment was adopted to perform the runs. Recently, Moulis and Krýsa [14] investigated the photodegradation of -hexane, -butyl acetate, toluene, and mixtures of two first ones, using TiO 2 supported on plates and UV radiation in a continuous recycling system. It was found

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Determination of Quantum Yield in a Heterogeneous Photocatalytic System Using a Fitting-Parameters Model

Abstract: Global quantum yield and overall volumetric rate of photon absorption (OVRPA) were quantified for TiO

Cited by 8 publications

References 0 publications

A kinetic study of the photoinduced oxo-transfer using a Mo complex anchored to TiO2

A kinetic study of the photoinduced oxo-transfer using a Mo complex anchored to TiO2

Degradación Fotocatalítica Solar Heterogénea de Ácido Dicloroacético en un Reactor Placa Plana a Escala Piloto

Mixing Rules Formulation for a Kinetic Model of the Langmuir-Hinshelwood Semipredictive Type Applied to the Heterogeneous Photocatalytic Degradation of Multicomponent Mixtures

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