Hydrogen peroxide-assisted low pressure UV photodegradation of atrazine in aqueous solution

Li, Cong; Gao, Naiyun; Wang, Li; Shen, Yue

doi:10.1080/00207233.2012.674780

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…Chen et al reported that O 2 • − occurs in TC aqueous solution under simulated sunlight illumination [ 19 ]. The O 2 • − can disproportionally generate H 2 O 2 , which can be decomposed to •OH under light illumination [ 42 ]. Liu et al investigated the •OH occurring in oxytetracycline (OTC) aqueous solution under UV light illumination and found that the oxygen molecule could accept an electron to form O 2 • − , be decomposed to yield H 2 O 2 [ 43 ] and, in turn, yield oxygen-dependent •OH under light illumination.…”

Section: Discussionmentioning

confidence: 99%

“…The hydroxylation byproducts and water loss from the OTC photoreaction could be generated in OTC aqueous solution under UV light illumination [ 43 ]. The production of OH radicals from the photolysis of the –O–O– peroxidic bond via H 2 O 2 under UV illumination can attack organic molecules [ 42 ]. Niu et al reported that the TC photoreaction can react with O 2 • − directly and undergo O 2 • − -mediated self-sensitized photolysis [ 34 ].…”

Section: Discussionmentioning

confidence: 99%

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Effects of 462 nm Light-Emitting Diode on the Inactivation of Escherichia coli and a Multidrug-Resistant by Tetracycline Photoreaction

Huang

Lee

et al. 2018

JCM

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The adaptability of bacterial resistance to antibiotics contributes to its high efficiency during evolution. Tetracycline (TC) is a broad-spectrum antimicrobial agent. Chromatographic analyses and mass spectrometry were used to study the effects of the light illumination of a 462 nm light-emitting diode (LED) on the conformational changes of TC in a phosphate buffer solution (PBS, pH 7.8). Especially, the inactivation of superoxide anion radicals (O2•−) and Escherichia coli (E. coli), including that of a multidrug-resistant E. coli (MDR E. coli), were investigated during the photolysis of TC. A photolysis product of TC (PPT) was generated in an alkaline solution after the illumination of a blue light. The mass spectra of PPT had characteristic ion signals in m/z 459, 445, and 249.1 Da. The PPT has the molecular formula of C22H22N2O9, and the exact mass is 458.44 g/mol. The inactivation of MDR E. coli is not significant with TC treatment. The drug-resistant ability of MDR E. coli has a less significant effect on PPT, and the changed conformation of TC retained the inactivation ability of MDR E. coli upon blue light photoreaction. With TC, illuminated by a blue light in a pH 7.8 PBS, O2•− was generated from TC photolysis, which enhanced the inactivation of E. coli and MDR E. coli. A 96.6% inactivation rate of MDR E. coli was reached with TC under 2.0 mW/cm2 blue light illumination at 25 ± 3 °C for 120 min, and the effects of the TC-treated photoreaction on MDR E. coli viability repressed the growth of MDR E. coli by 4 to 5 logs. The present study of the blue light photoreaction of TC offers a new approach to the inactivation of MDR E. coli.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effects of 462 nm Light-Emitting Diode on the Inactivation of Escherichia coli and a Multidrug-Resistant by Tetracycline Photoreaction

Huang

Lee

et al. 2018

JCM

View full text Add to dashboard Cite

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“…In the last decade, advanced oxidation processes (AOPs) have become important technologies for water treatment [1,2] and have been reported for the effective destruction of refractory pollution [2][3][4]. In AOPs, the principal oxidising species are highly active hydroxyl radicals ( Å OH), which have been proposed as an oxidant [5].…”

Section: Introductionmentioning

confidence: 99%