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Hegedüs, Márta; Dombi, András; Kiricsi, Imre

doi:10.1023/a:1017968507589

Cited by 7 publications

(1 citation statement)

References 6 publications

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“…The formations of dichloroacetate and phosgene from the TCE photodegradation were reported by other research groups who carried out the experiments in a closed IR cell 6,22 or sealed NMR tubes . Hegedus et al detected phosgene and trichloroacetyl chloride as intermediates from the PCE photodegradation using an in situ photocatalytic reactor with FT-IR analysis in batch mode . Sano et al described the formation of chloroacetyl chloride from the CE photodegradation in a closed gas circulation system. , The Cl radical-initiated reaction occurs more easily in such reactor systems where there is no addition of reactants or removal of products.…”

Section: Discussionmentioning

confidence: 82%

Reaction Mechanism of Photocatalytic Degradation of Chlorinated Ethylenes on Porous TiO₂ Pellets: Cl Radical-Initiated Mechanism

et al. 2004

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The photoassisted catalytic degradation of chloroethylene was studied in a tubular photoreactor packed with TiO 2 pellets prepared by a sol-gel method. The experiments were performed in a noncirculating mode. Kinetic data and the reaction products were compared with those for the photodegradation of ethylene, trichloroethylene, and tetrachloroethylene. The theoretical calculations at the MP4/6-31G**//B3LYP/6-31G** level indicated that the addition of OH radicals to chlorinated ethylenes is more exothermic than that of Cl radicals by 14.6-29.5 kcal mol -1 . Examination of Cl mass balance indicated that the concentration of Clcollected from the TiO 2 surface was higher than that from the product gas stream. When the photodegradation of ethylene was performed on the TiO 2 pellets which had been used for that of TCE or which were pretreated with HCl, the formation of chloroacetaldehyde was confirmed by the GC/MS. We proposed that during the photodegradation of the chlorinated ethylenes, the Cl -, as one of the reaction products, accumulated and was oxidized to Cl radical on the TiO 2 surface, which might be due to the oxidation by OH radical. Then, the Cl radical reacted with chlorinated ethylenes, leading to the formation of undesirable chlorinated byproducts.

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Section: Discussionmentioning

confidence: 82%

Reaction Mechanism of Photocatalytic Degradation of Chlorinated Ethylenes on Porous TiO₂ Pellets: Cl Radical-Initiated Mechanism

et al. 2004

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Photocatalysis: Introduction, Mechanism, and Effective Parameters

Veréb

Firak

Alapi

2021

Green Chemistry and Sustainable Technology

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The widely investigated heterogeneous photocatalysis offers an environmentally friendly, efficient, and versatile solution for several environmental problems. Among others, the removal of harmful organic pollutants and the generation of H 2 via water splitting are well-known and most widely studied applications. The process is based on the charge separation caused by the excitation of semiconductor photocatalyst via photon absorption. Due to the intensive development of material science, in addition to the well-known TiO 2 and ZnO, several new semiconductor materials have been designed and synthesized to increase the efficiency of heterogeneous photocatalysis and utilization of solar and/or visible light. This chapter describes the principles and mechanisms of heterogeneous photocatalysis, including the formation of photogenerated charge carriers, the role of different reactive species, and the effect of key parameters on the efficiency.

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Photocatalytic Detoxification of Water and Air

Robertson¹,

Bahnemann²,

Robertson³

et al.

The Handbook of Environmental Chemistry

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Cited by 7 publications

References 6 publications

Reaction Mechanism of Photocatalytic Degradation of Chlorinated Ethylenes on Porous TiO₂ Pellets: Cl Radical-Initiated Mechanism

Reaction Mechanism of Photocatalytic Degradation of Chlorinated Ethylenes on Porous TiO₂ Pellets: Cl Radical-Initiated Mechanism

Photocatalysis: Introduction, Mechanism, and Effective Parameters

Photocatalytic Detoxification of Water and Air

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Untitled

Cited by 7 publications

References 6 publications

Reaction Mechanism of Photocatalytic Degradation of Chlorinated Ethylenes on Porous TiO2 Pellets: Cl Radical-Initiated Mechanism

Reaction Mechanism of Photocatalytic Degradation of Chlorinated Ethylenes on Porous TiO2 Pellets: Cl Radical-Initiated Mechanism

Photocatalysis: Introduction, Mechanism, and Effective Parameters

Photocatalytic Detoxification of Water and Air

Contact Info

Product

Resources

About

Reaction Mechanism of Photocatalytic Degradation of Chlorinated Ethylenes on Porous TiO₂ Pellets: Cl Radical-Initiated Mechanism

Reaction Mechanism of Photocatalytic Degradation of Chlorinated Ethylenes on Porous TiO₂ Pellets: Cl Radical-Initiated Mechanism