Photocatalytic Reactions Involving Hydroxyl Radical Attack

Alfano, Orlando Mario; Cabrera, Maria Ines; Cassano, Alberto E.

doi:10.1006/jcat.1997.1858

Cited by 148 publications

(83 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Equation [8] is valid for this study, since the initial concentration of phenol is 10 ppm and the degradation of phenol follows pseudo-first order, which is shown in Fig. 5.…”

Section: Discussionmentioning

confidence: 97%

A Kinetic Study on Photocatalytic Oxidation of Phenol in Water by Silica-Dispersed Titania Nanoparticles

Ding

Greenfield

2000

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…Equation [8] is valid for this study, since the initial concentration of phenol is 10 ppm and the degradation of phenol follows pseudo-first order, which is shown in Fig. 5.…”

Section: Discussionmentioning

confidence: 97%

A Kinetic Study on Photocatalytic Oxidation of Phenol in Water by Silica-Dispersed Titania Nanoparticles

Ding

Greenfield

2000

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…If the thickness of reaction solution is much larger than the optical penetration length at any given illumination intensity and catalyst concentration, the photoreactor will be underutilized. 6 In the same geometry, using different UV lamps, it may be observed that there is no correspondence between UV power and incident photon flow, because nearly the same incident photon flow was measured for 80-and 125-W lamps.…”

Section: Resultsmentioning

confidence: 99%

“…24 If the system is not sufficiently irradiated, the rate of photocatalytic degradation increases with the light intensity, enabling more TiO 2 particles to be activated. 6 On the other hand, as the light intensity is increased, the recombination of the electron/hole on the photocatalyst becomes more frequent. 8 As previously discussed, the photodegradation of phenol seems to be initiated through the reaction of OH⅐ with phenol in solution.…”

Section: Effect Of Uv Light Sourcementioning

confidence: 99%

Evaluation of Relative Photonic Efficiency in Heterogeneous Photocatalytic Reactors

Netto

Sauer

José

et al. 2004

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

The evaluation of photonic efficiency in heterogeneous photocatalysis remains elusive because the number of absorbed photons is difficult to assess experimentally. The photonic efficiency of heterogeneous photocatalytic reactors depends on the reactor geometry, irradiation source, and photocatalyst properties. In this work, the relative photonic efficiency of heterogeneous photocatalytic reactors to degrade an azo dye was evaluated using phenol as the standard system. The experimental tests were carried out in a batch reactor under different conditions of pH, catalyst dosage, initial concentration, and ultraviolet (UV) lamps. The kinetics of disappearance of both phenol and azo dye were studied using the initial rate method and were described according to the Langmuir-Hinshelwood (L-H) kinetic model. It was observed that the relative photonic efficiency depends on the adsorption/desorption properties of the photocatalyst.

show abstract

“…This strategy, which was first reported by Turchi and Ollis [15] and Alfano et al [16], has led to the writing of several critical photo-kinetic laws, such as the modified Langmuir-Hinshelwood equation.…”

mentioning

confidence: 95%

“…As an advanced oxidation process, heterogeneous photocatalysis uses sunlight as the promotor of the redox reactions responsible for removing the contaminants. The general mechanism of photocatalysis for degrading organic pollutants has been reported in several papers [15,16] and involves the generation of electron-hole pairs, which in the presence of electron acceptors such as atmospheric oxygen, leads to the formation of potent oxidant agents that can destroy and mineralize organic matter.…”

mentioning

confidence: 99%

Photocatalytic Degradation of Commercial Acetaminophen: Evaluation, Modeling, and Scaling-Up of Photoreactors

et al. 2018

View full text Add to dashboard Cite

Abstract:In this work, the performance of a pilot-scale solar CPC reactor was evaluated for the degradation of commercial acetaminophen, using TiO 2 P25 as a catalyst. The statistical Taguchi's method was used to estimate the combination of initial pH and catalyst load while tackling the variability of the solar radiation intensity under tropical weather conditions through the estimation of the signal-to-noise ratios (S/N) of the controllable variables. Moreover, a kinetic law that included the explicit dependence on the local volumetric rate of photon absorption (LVRPA) was used. The radiant field was estimated by joining the Six Flux Model (SFM) with a solar emission model based on clarity index (K C ), whereas the mass balance was coupled to the hydrodynamic equations, corresponding to the turbulent regime. For scaling-up purposes, the ratio of the total area-to-total-pollutant volume (A T /V T ) was varied for observing the effect of this parameter on the overall plant performance. The Taguchi's experimental design results showed that the best combination of initial pH and catalyst load was 9 and 0.6 g L −1 , respectively. Also, full-scale plants would require far fewer ratios of A T /V T than for pilot or intermediate-scale ones. This information may be beneficial for reducing assembling costs of photocatalytic reactors scaling-up.

show abstract

Photocatalytic Reactions Involving Hydroxyl Radical Attack

Cited by 148 publications

References 16 publications

A Kinetic Study on Photocatalytic Oxidation of Phenol in Water by Silica-Dispersed Titania Nanoparticles

A Kinetic Study on Photocatalytic Oxidation of Phenol in Water by Silica-Dispersed Titania Nanoparticles

Evaluation of Relative Photonic Efficiency in Heterogeneous Photocatalytic Reactors

Photocatalytic Degradation of Commercial Acetaminophen: Evaluation, Modeling, and Scaling-Up of Photoreactors

Contact Info

Product

Resources

About