Reaction pathways and kinetics of butylated hydroxyanisole with UV, ozonation, and UV/O3 processes

Lau, T. K.; Chu, Wei; Graham, Nigel

doi:10.1016/j.watres.2006.11.021

Cited by 38 publications

(17 citation statements)

References 21 publications

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“…In addition, compound 12 was detected in the degradation of LNR and compound 13 (DCPMU) by UV irradiation at 254 nm, indicating this product is from the hydroxylation of benzene ring of DCPMU. The hydroxylation of benzene ring has been reported by other researchers [19,20]. Jin et al proposed two possible mechanisms (one is the presence of oxygen leading to the production of O 2…”

Section: Uv Photolysismentioning

confidence: 84%

Degradation of linuron by UV, ozonation, and UV/O3 processes—Effect of anions and reaction mechanism

Rao

Chu

2010

Journal of Hazardous Materials

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Section: Uv Photolysismentioning

confidence: 84%

Degradation of linuron by UV, ozonation, and UV/O3 processes—Effect of anions and reaction mechanism

Rao

Chu

2010

Journal of Hazardous Materials

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“…UV has been used to degrade several environmental contaminants . For some chemicals, the degradation process is advanced in the presence of ozone and photocatalysts . The UV spectrum can be divided into UVA (320–400 nm), UVB (280–320 nm) and UVC (200–280 nm), with the energy ranking in decreasing order: UVC > UVB > UVA.…”

Section: Discussionmentioning

confidence: 99%

Nonylphenol Polyethoxylates Degraded by Three Different Wavelengths of UV and Their Genotoxic Change—Detected by Generation of γ‐H2AX

Kubota

Toyooka

Ibuki

2012

Photochem & Photobiology

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UV rays in sunlight are an important factor in the degradation of chemicals. In this study, we investigated the degradation of nonionic surfactants, nonylphenol polyethoxylates (NPEOs) with 10 or 70 ethylene oxide (EO) units using UVA, B and C, and their genotoxic change based on phosphorylation of histone H2AX (γ‐H2AX), a marker of DNA damage. NPEOs were degraded dependent on the energy of UV, that is, UVC having the highest energy was most effective, whereas UVA having the lowest energy caused little change. The EO side chain of NPEO(70) was broken near the benzene ring by UV, producing NPEOs with a shortened EO chain (around 10 units). The generation of γ‐H2AX reflected the pattern of degradation; shortening of the EO chain changed NPEO(70) into an inducer for γ‐H2AX, and degradation of NPEO(10) attenuated the genotoxicity. The γ‐H2AX generated by NPEO(10) and UV‐degraded NPEO(70) was independent of the cell cycle. The formation of DNA double strand breaks detected by gel electrophoresis was consistent with the results for γ‐H2AX. These results suggested that UV rays can make NPEOs harmless or genotoxic according to the degradation of the EO side chain, the effects being dependent on wavelength.

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“…Subsequently, • OH reacts with aqueous ozone to generate singlet oxygen and peroxyl radical . The combined UV/ozone system is commonly used for water treatments . However, while studying the bactericidal and fungicidal effects of UV–C irradiation, the impact of the associated ozone product (concomitantly generated with UV–C irradiation) is often neglected.…”

Section: Introductionmentioning

confidence: 99%

Role of Ozone in UV‐C Disinfection, Demonstrated by Comparison between Wild‐Type and Mutant Conidia of Aspergillus niger

Liu

Zhou

Chen

et al. 2014

Photochem & Photobiology

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This study aimed to investigate the tolerance of a melanized wild-type strain of Aspergillus niger (CON1) and its light-colored mutant (MUT1) to UV-C light and the concomitantly generated ozone. Treatments were segregated into four groups based on whether UV irradiation was used and the presence or absence of ozone: (-UV, -O3), (-UV, +O3), (+UV, -O3) and (+UV, +O3). The survival of CON1 and MUT1 conidia under +UV decreased as the exposure time increased, with CON1 showing greater resistance to UV irradiation than MUT1. Ozone induced CON1 conidium inactivation only under conditions of UV radiation exposure. While, the inactivation effect of ozone on MUT1 was always detectable regardless of the presence of UV irradiation. Furthermore, the CON1 conidial suspension showed lower UV light transmission than MUT1 when examined at the same concentration. Compared with the pigment in MUT1, the melanin in CON1 exhibited more potent radical-scavenging activity and stronger UV absorbance. These results suggested that melanin protected A. niger against UV disinfection via UV screening and free radical scavenging. The process by which UV-C disinfection induces a continual decrease in conidial survival suggests that UV irradiation and ozone exert a synergistic fungicidal effect on A. niger prior to reaching a plateau.

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Reaction pathways and kinetics of butylated hydroxyanisole with UV, ozonation, and UV/O3 processes

Cited by 38 publications

References 21 publications

Degradation of linuron by UV, ozonation, and UV/O3 processes—Effect of anions and reaction mechanism

Degradation of linuron by UV, ozonation, and UV/O3 processes—Effect of anions and reaction mechanism

Nonylphenol Polyethoxylates Degraded by Three Different Wavelengths of UV and Their Genotoxic Change—Detected by Generation of γ‐H2AX

Role of Ozone in UV‐C Disinfection, Demonstrated by Comparison between Wild‐Type and Mutant Conidia of Aspergillus niger

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