UV/H<sub>2</sub>O<sub>2</sub> Process Under High Intensity UV Irradiation: A Rapid and Effective Method for Methylene Blue Decolorization

Zhang, Qian; Li, Chaolin; Li, Ting

doi:10.1002/clen.201100582

Cited by 9 publications

(5 citation statements)

References 32 publications

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“…The results obtained here are consistent with numerous studies by our group and others, which show that UV + H 2 O 2 can readily degrade an array of organic compounds [ 36 , 37 ].…”

Section: Resultssupporting

confidence: 92%

Comparative Degradation of a Thiazole Pollutant by an Advanced Oxidation Process and an Enzymatic Approach

et al. 2017

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Organic pollutants, especially those found in water bodies, pose a direct threat to various aquatic organisms as well as humans. A variety of different remediation approaches, including chemical and biological methods, have been developed for the degradation of various organic pollutants. However, comparative mechanistic studies of pollutant degradation by these different systems are almost non-existent. In this study, the degradation of a model thiazole pollutant, thioflavin T (ThT), was carried out in the presence of either an advanced oxidation process (ultraviolet (UV) + H2O2) or a chloroperoxidase enzyme system (CPO + H2O2). The degradation was followed both spectrophotometrically and using liquid chromatography-mass spectroscopy (LC-MS), and the products formed were identified using tandem liquid chromatography-mass spectrometry-mass spectrometry (LC-MS-MS). The results show that the two remediation approaches produced different sets of intermediates, with only one common species (a demethylated form of ThT). This suggests that different degradation schemes were operating in the two systems. Interestingly, one of the major intermediates produced by the CPO + H2O2 system was a chlorinated form of thioflavin. Phytotoxicity studies showed that the CPO + H2O2-treated ThT solution was significantly (p < 0.05) less toxic than the UV + H2O2-treated ThT solution. This is the first time that a comparative mechanistic study showing in detail the intermediates generated in chemical and biological remediation methods has been presented. Furthermore, the results show that different remediation systems have very different degradation schemes and result in products having different toxicities.

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“…The results obtained here are consistent with numerous studies by our group and others, which show that UV + H 2 O 2 can readily degrade an array of organic compounds [ 36 , 37 ].…”

Section: Resultssupporting

confidence: 92%

Comparative Degradation of a Thiazole Pollutant by an Advanced Oxidation Process and an Enzymatic Approach

et al. 2017

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“…Conversion increases until an optimal H 2 O 2 concentration of 0.09%v/v for both UV excilamps, probably due to a higher hydroxyl radical production [36]. Further increase of the H 2 O 2 initial concentration (0.17%v/v) leads to a decrease in conversion, as previously reported [43,44]. The decrease in conversion could be explained by the promotion of competitive reactions, favoured by a higher H 2 O 2 concentration, that consumes hydroxyl radicals to produce other oxidizing species (like HO 2 •) less effective for dye decolourization and/or to produce H 2 O 2 by dimerization [36,40].…”

Section: Effect Of the Type Of Lamp And H 2 O 2 Initial Concentration...supporting

confidence: 72%

KrCl and XeCl excilamps and LP-Hg lamp for UV and UV/H₂O₂decolourization of dyes in water

Aristizábal

Perilla

Lara-Borrero

et al. 2018

Environmental Technology

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In the present study, the decolourization efficiencies of LP-Hg lamp, XeCl and KrCl excilamps at the same power density were compared for the decolourization of dyes in water by UV and UV/HO processes in a batch reactor. Laboratory prototypes of XeCl and KrCl excilamps and a commercial LP-Hg lamp were studied as UV sources. Methylene Blue and Eliamine Blue dyes were used as model pollutants. The effect of the initial concentrations of dye and HO in the TOC removal and kinetic parameters were also studied. The ratio of dye decolourization to the electric power consumption of the KrCl excilamp and LP-Hg lamp for the decolourization of Methylene Blue and Eliamine Blue were evaluated. As a result, the KrCl excilamp showed significantly higher decolourization efficiencies than LP-Hg lamp and XeCl excilamp, but the dye removal rate was significantly slower for Methylene Blue than for Eliamine Blue with this lamp. The KrCl lamp can be an alternative to conventional LP-Hg lamp for the decolourization of dyes by photodegradation, but it depends on the type of dye treated. The addition of HO in a concentration between 0.05 and 0.09%v/v increases significantly the efficiency of the decolourization of Methylene Blue, and further increase does not lead to a higher increase in conversion. The experimental data were fitted to the one phase decay kinetic model with good agreement and the kinetic parameters were reported.

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“…In this study, however, a simple pseudo‐first‐order rate equation was used to assess the experimental data acquired with a plug‐flow UV/LED reactor for the decolorization of methylene blue. This is supported by other published works, in which a pseudo‐first‐order rate equation was used to analyze experimental data for the degradation of various pollutants in UV/H 2 O 2 processes .…”

Section: Introductionsupporting

confidence: 63%

An investigation on the use of ultraviolet light emitting diodes (UV LEDs) in a plug‐flow reactor for water treatment

Almquist

Fyda

Godby³

et al. 2017

Env Prog and Sustain Energy

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In this study, a small bench‐scale plug‐flow reactor was designed and characterized to demonstrate the feasibility of using UV/LEDs as a UV source in flow‐through advanced oxidation processes. The plug‐flow reactor was characterized by investigating the effects of residence time, H2O2/methylene blue molar ratio, and initial methylene blue concentration on methylene blue decolorization in water. Methylene blue was selected as a witness dye, because it does not degrade with H2O2 or with UV alone, and it has reduced absorption in the visible spectrum when reacted with OH radicals. UV/LEDs have been employed successfully in AOPs for water treatment in research‐scale systems, as demonstrated in this study. However, they currently have low optical output, which limits their applicability for water treatment to small point‐of‐use systems. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 857–863, 2017

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UV/H₂O₂ Process Under High Intensity UV Irradiation: A Rapid and Effective Method for Methylene Blue Decolorization

Cited by 9 publications

References 32 publications

Comparative Degradation of a Thiazole Pollutant by an Advanced Oxidation Process and an Enzymatic Approach

Comparative Degradation of a Thiazole Pollutant by an Advanced Oxidation Process and an Enzymatic Approach

KrCl and XeCl excilamps and LP-Hg lamp for UV and UV/H₂O₂decolourization of dyes in water

An investigation on the use of ultraviolet light emitting diodes (UV LEDs) in a plug‐flow reactor for water treatment

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UV/H2O2 Process Under High Intensity UV Irradiation: A Rapid and Effective Method for Methylene Blue Decolorization

Cited by 9 publications

References 32 publications

Comparative Degradation of a Thiazole Pollutant by an Advanced Oxidation Process and an Enzymatic Approach

Comparative Degradation of a Thiazole Pollutant by an Advanced Oxidation Process and an Enzymatic Approach

KrCl and XeCl excilamps and LP-Hg lamp for UV and UV/H2O2decolourization of dyes in water

An investigation on the use of ultraviolet light emitting diodes (UV LEDs) in a plug‐flow reactor for water treatment

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Product

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About

UV/H₂O₂ Process Under High Intensity UV Irradiation: A Rapid and Effective Method for Methylene Blue Decolorization

KrCl and XeCl excilamps and LP-Hg lamp for UV and UV/H₂O₂decolourization of dyes in water