Photochemical degradation of trichloroethylene by sulfite-mediated UV irradiation

Jung, Byungjo; Farzaneh, Hajar; Khodary, Ahmed; Abdel‐Wahab, Ahmed

doi:10.1016/j.jece.2015.07.026

Cited by 30 publications

(13 citation statements)

References 43 publications

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“…Moreover, chloride ions are a major byproduct of TCE degradation by PV3A-nZVI. According to previous studies [42,43] and our findings, the proposed pathways for the reductive dechlorination of TCE are displayed in Fig. 10.…”

Section: Tce Degradation Products and Pathwayssupporting

confidence: 64%

“…Only a few reports have evaluated the degradation products of TCE using the photochemical method [42] and a Pd-catalytic approach [43]. Jung et al [42] investigated the photochemical degradation of TCE through sulfite-mediated UV irradiation and found that degradation byproducts included 1,1-dichloroethylene (1,1-DCE), cis-DCE, trans-DCE, vinyl chloride (VC), chloroacetylene, ethylene, and ethane. Yuan et al [43] indicated that the most abundant byproduct is ethane.…”

Section: Tce Degradation Products and Pathwaysmentioning

confidence: 99%

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Effect of operating parameters on trichloroethylene degradation by extended release of nanoscale zero-valent iron

Chen

Hsia

et al. 2016

Desalination and Water Treatment

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A B S T R A C TThis study investigated the effects of various operating parameters on the efficiency and kinetics of trichloroethylene (TCE) degradation by commercial, polyvinyl alcohol-co-vinylacetate-co-itaconic acid (PV3A) stabilized nanoscale zero-valent iron (PV3A-nZVI). The results showed that TCE degradation was a pseudo-first-order reaction. The degradation efficiency and the apparent rate constant of TCE increased with the increasing PV3A-nZVI dosage and decreased with the increasing initial TCE concentration and pH. In addition, the effect of the solution matrix was evaluated. The results suggested that increasing the seawater ratio in the solution suppressed TCE degradation. The apparent rate constants of TCE decreased from 2.79 × 10 −2 to 9.10 × 10 −3 min −1 , and the seawater ratio increased from zero to 100% at 5 g/L PV3A-nZVI and 10 mg/L TCE. Moreover, an investigation of TCE degradation products confirmed that reductive dechlorination through the successive loss of chloride ions is the main pathway of TCE degradation, and ethene is the predominant byproduct during TCE dechlorination. Notably, nearly 100% TCE (10 g/L) removal was achieved with 5 g/L PV3A-nZVI in pure water and seawater within 90 and 120 min, respectively. Hence, PV3A-nZVI is a promising technology for remediating surface water, groundwater, and seawater matrices contaminated with TCE.

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Section: Tce Degradation Products and Pathwayssupporting

confidence: 64%

Section: Tce Degradation Products and Pathwaysmentioning

confidence: 99%

Effect of operating parameters on trichloroethylene degradation by extended release of nanoscale zero-valent iron

Chen

Hsia

et al. 2016

Desalination and Water Treatment

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“…Our previous studies have proven that sulfite radical is an effective specie for TCE degradation [40]. Sulfite radicals are usually created upon the photolysis of S IV under middle UV light.…”

Section: Resultsmentioning

confidence: 99%

“…[51]. In our previous study on TCE degradation in solutions of S IV irradiated by UV light, TCE was almost completely transformed to chloride ion when sufficient S IV was present [40]. Figure 14 shows concentrations of TCE, S IV , and chloride ion over irradiation time.…”

Section: Cycling Performance To Degrade Tcementioning

confidence: 96%

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Simulated solar light-driven photocatalytic degradation of trichloroethylene in water using BiOBr promoted by sulfite addition

Jung

Deng

et al. 2020

Environ Sci Eur

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Background: Photodegradation of trichloroethylene (TCE) in aqueous solution under simulated solar light irradiation was studied under different experimental conditions to determine the reaction mechanism and kinetics that control TCE degradation using bismuth oxybromide (BiOBr) in the presence of sulfite. Photocatalysts were synthesized to be more responsive to visible light under simulated solar light and particular attention was focused on the reactive specie formed by reaction of the sulfite on the surface of BiOBr under simulated sunlight. Result: Degradation rate of TCE was greatly enhanced by the presence of sulfite, and the enhancement increased with sulfite dose to a maximum that was retained at higher sulfite doses. Degradation rate of TCE was also affected by other factors, such as initial TCE concentration, BiOBr dose, and solution pH. In addition, the cycling performance of BiOBr was examined, and the amount of TCE degraded was almost constant over increasing cycle numbers when initial sulfite concentration was high enough to maintain a suitable sulfite concentration throughout the experiment. When TCE was degraded by BiOBr in the presence of sulfite under simulated sunlight irradiation, the major by-product measured was the non-hazardous chloride ion, and dechlorination efficiency was about 58%. Conclusion: This study extended the use of a potential effective photocatalyst (BiOBr) to a semi-volatile organic contaminant (TCE), not limited to mainly focus on organic dyes, and evaluated the use of sulfite as a hole scavenger in order to enhance the degradation of TCE without needing to manipulate the structure of BiOBr. The active species being responsible for TCE degradation in BiOBr/TCE/sulfite system under simulated solar light was the sulfite radical (SO 3 •−), and the photocatalytic activity of BiOBr did not decrease over a number of treatment cycles when S IV dose was sufficient.

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Advanced Reduction and Oxidation–Reduction Processes for Water Treatment

Batchelor

2019

Encyclopedia of Water

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Oxidation–reduction reactions are important processes for water treatment because they chemically change contaminants, rather than only transfer them from the water phase. However, the rates of many oxidation–reduction reactions limit their use as treatment processes. This limitation can be overcome by using highly reactive free radicals as the chemical reductant, and treatment processes that do this can be called advanced reduction processes (ARPs). Treatment processes that rely on both oxidizing and reducing radicals can be called advanced oxidation–reduction processes, and both are similar to advanced oxidation processes that apply oxidizing radicals to water treatment. This article reviews a number of applications of ARPs and summarizes the characteristics of some AORPs. ARPs have been applied to a wide range of contaminants including halogenated organics and oxidized inorganic compounds. The effects of important process variables such as incident photon flux, reagent concentration, target compound concentration, and solution pH are reviewed for ARPs, and a simple kinetic model is presented that describes much of their behavior that has been observed. The basic aspects of two important AORPs (electron beam irradiation and photocatalysis) are discussed, and a kinetic model describing the dose coefficient for electron beam treatment is presented.

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Photochemical degradation of trichloroethylene by sulfite-mediated UV irradiation

Cited by 30 publications

References 43 publications

Effect of operating parameters on trichloroethylene degradation by extended release of nanoscale zero-valent iron

Effect of operating parameters on trichloroethylene degradation by extended release of nanoscale zero-valent iron

Simulated solar light-driven photocatalytic degradation of trichloroethylene in water using BiOBr promoted by sulfite addition

Advanced Reduction and Oxidation–Reduction Processes for Water Treatment

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