Treatment of Mixture Pollutants with Combined Plasma Photocatalysis in Continuous Tubular Reactors with Atmospheric-Pressure Environment: Understanding Synergetic Effect Sources

Khezami, Lotfi; Assadi, Aymen Amin

doi:10.3390/ma16216857

Cited by 2 publications

(3 citation statements)

References 41 publications

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“…Oxygen can be transformed into a superoxide anion (O 2 * − ) by reacting with the photogenerated electrons on the surface of the catalyst, according to the following reaction [15]:…”

Section: H O + E → H * + Oh * + E H O + H → Oh * + Hmentioning

confidence: 99%

“…Heterogeneous photocatalysis involves the absorption of photons by a semiconductor with an energy equal to or greater than that of the band gap (E c − E v ), facilitating the flow of electrons from the valence band (E v ) to the conduction band (E c ) [12,13]. This process generates a positive hole (h+) at the valence band and releases an electron (e−) into the conduction band [14,15]. This chemical process consists of oxidizing the pollutant on a catalyst (TiO 2 usually) under UV radiation [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Modeling of the Photocatalytic Degradation of Chlorinated Aromatic Volatile Organic Compounds: Mass Transfer Enhancement

Koné,

Assadi,

Belkessa

et al. 2024

Applied Sciences

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Chlorobenzene (CB) and Chloronaphthalene (CN) emissions from cement plant operations pose significant environmental risks. This study investigates the mass transfer effects of chlorinated aromatic Volatile Organic Compounds (VOCs), specifically CB and CN, in the gas phase of a continuous-tangential-flow annular photocatalytic reactor. The experiments involved introducing CB and CN into the reactor, and the degradation kinetics were analyzed using the Langmuir–Hinshelwood (L-H) model. The L-H model was applied to assess the impact of the flow rate, concentration, and relative humidity (% RH) on the degradation rate (DR). The results indicate that both the experimental and simulated degradation rates improved with increased flow rates (1 to 9 m3·h−¹) and inlet concentrations (30 to 216 mg·m−3). This enhancement of the DR correlates with the availability of active OH* species on the TiO2 surface. The L-H model emphasizes the role of H2O molecules in VOC removal kinetics. The degradation rates increased with a rising water content (5 to 55%), but adverse effects on VOC conversion were observed beyond a 55% RH. This study reveals a mass transfer effect, with internal diffusional limitations in the TiO2 pores under operational conditions. The kinetics were predominantly controlled by chemical kinetics and catalyst pore availability. Furthermore, this study demonstrates a higher CB degradation than CN in the reactor and experimental conditions. For a concentration of 1.328 mM·m−3, the CB DR ranged from 0.70 to 2.84 µM·m2·s−¹, as the flow rate varied from 1 to 9 m3·h−¹. The CN DR varied from 0.60 to 2.20 µM·m2·s−¹ within the same flow rate range.

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“…Oxygen can be transformed into a superoxide anion (O 2 * − ) by reacting with the photogenerated electrons on the surface of the catalyst, according to the following reaction [15]:…”

Section: H O + E → H * + Oh * + E H O + H → Oh * + Hmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetic Modeling of the Photocatalytic Degradation of Chlorinated Aromatic Volatile Organic Compounds: Mass Transfer Enhancement

Koné,

Assadi,

Belkessa

et al. 2024

Applied Sciences

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“…In recent years, the dielectric barrier discharge (DBD) reactors have been widely used for hazardous pollutant removal. Khezami et al [3] investigated the pilot-scale combination of non-thermal plasma and photocatalysis for removing toluene and dimethyl sulfur and revealed the effects of plasma energy and initial pollutant concentration on the performance and by-product formation in both pure compounds and mixtures. They found that coupling DBD plasma with a TiO 2 catalyst can achieve a synergetic effect, which resulted in improved toluene and dimethyl sulfur removal.…”

mentioning

confidence: 99%