Role of humic substances in the photodegradation of naproxen under simulated sunlight

Chen, Yong; Liu, Lu; Su, Jing; Liang, Jianfeng; Wu, Bo; Zuo, Jiaolan; Zuo, Yuegang

doi:10.1016/j.chemosphere.2017.08.110

Cited by 58 publications

(17 citation statements)

References 55 publications

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“…In fact, organic pollutants are known to undergo degradation processes in environmental waters which must be taken into consideration. Photolysis can be one of the major ways of degradation for pharmaceutical compounds absorbing solar light as well as for those degraded by photosensitization (Szabo et al, 2011;Zuo et al, 2013;Carlson et al, 2015;Zhang et al, 2016;Chen et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of novel oral anticoagulants under sunlight irradiation in aqueous matrices

et al. 2018

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Kinetics of photodegradation of novel oral anticoagulants dabigatran, rivaroxaban, and apixaban were studied under simulated solar light irradiation in purified, mineral, and river waters. Dabigatran and rivaroxaban underwent direct photolysis with polychromatic quantum yields of 2.2 × 10 and 4.4 × 10, respectively. The direct photodegradation of apixaban was not observed after 19 h of irradiation. Kinetics of degradation of rivaroxaban was not impacted by the nature of the aqueous matrix while photosensitization from nitrate ions was observed for dabigatran and apixaban dissolved in a mineral water. The photosensitized reactions were limited in the tested river water (Isle River, Périgueux, France) certainly due to the hydroxyl radical scavenging effect of the dissolved organic matter. The study of photoproduct structures allowed to identify two compounds for dabigatran. One of them is the 4-aminobenzamidine while the second one is a cyclization product. In the case of rivaroxaban, as studied by very high field NMR, only one photoproduct was observed i.e. a photoisomer. Finally, seven photoproducts were clearly identified from the degradation of apixaban under simulated solar light.

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Section: Introductionmentioning

confidence: 99%

Photodegradation of novel oral anticoagulants under sunlight irradiation in aqueous matrices

et al. 2018

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“…Sotalol is known to show enhanced photodegradation in natural water in comparison to ultrapure water . Whereas, for naproxen, previous studies did not show enhanced photodegradation in the presence of humic substances. , DOM quality difference or other water matrix parameters can have an influence. However, more likely, the explanation for the difference is the different starting concentration (10 μg L –1 in this study vs 0.5–10 mg L –1 in previous studies , ).…”

Section: Resultsmentioning

confidence: 60%

Separation of Photochemical and Non-Photochemical Diurnal In-Stream Attenuation of Micropollutants

Schmitt

Wack

Glaser

et al. 2021

Environ. Sci. Technol.

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For a better process understanding of in-stream attenuation of trace organic contaminants (TrOCs), quantitative comparisons between field studies under different environmental conditions and controlled laboratory experiments are important to separate different processes. However, this is hampered by the challenge to transfer kinetics from the laboratory to different field conditions due to the lack of good quantitative measures to account for different boundary conditions. For phototransformation, in situ light conditions in a river are difficult to determine because light is reduced, for instance, by absorption, scattering on suspended particles, and shading effects. In this study, we present an approach to separate photochemical from non-photochemical diurnal in-stream attenuation based on rate constants relative to diclofenac, as a reference compound, to account for the difference in the in situ light conditions combined with laboratory experiments. 12 out of 45 detected target TrOCs showed a diurnal attenuation at a selected river stretch. A non-photochemical process, potentially biotransformation, was responsible for the diurnal attenuation of bisoprolol, metoprolol, O-desmethylvenlafaxine, tramadol, and venlafaxine. Attenuation of amisulpride, flufenamic acid, hydrochlorothiazide, naproxen, and xipamide can be quantitatively explained by phototransformation, partially for sotalol. Attenuation rate constants of hydrochlorothiazide at different field sites from this study and from published data range over 2 orders of magnitude. Differences can be quantitatively explained by different light exposures but not by water chemical parameters.

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“…The inhibitory effect increased with higher DOM concentrations. Three main mechanisms of the inhibitory effect of DOM have been proposed: (i) DOM can scavenge OH [ 37 , 44 , 45 ]; (ii) DOM can act as a light screen and screens photo-chemically active light [ 46 , 47 ]; and (iii) DOM can react with contaminant intermediates [ 48 , 49 ].…”

Section: Resultsmentioning

confidence: 99%

Degradation of Minocycline by the Adsorption–Catalysis Multifunctional PVDF–PVP–TiO2 Membrane: Degradation Kinetics, Photocatalytic Efficiency, and Toxicity of Products

Zhou

Sun

Zhang

et al. 2021

IJERPH

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The photocatalytic degradation of minocycline was studied by using polyvinylidene fluoride–polyvinylpyrrolidone–TiO2 (PVDF–PVP–TiO2) fiber mats prepared by an electrospinning technology. The influences of the TiO2 dosage, minocycline concentrations, inorganic anions, pH values, and dissolved organic matter (DOM) concentrations on the degradation kinetics were investigated. A mass of 97% minocycline was degraded in 45 min at 5% TiO2 dosage. The corresponding decomposition rate constant was 0.069 min−1. The inorganic anions affected the minocycline decomposition in the order of HCO3− > Cl− > SO42− > NO3−, which was confirmed by the results of electron spin resonance (ESR) spectra. The lowest electrical energy per order (EEO) was 6.5 Wh/L. Over five cycles, there was no change in the photocatalytic performance of the degrading minocycline. Those investigations suggested that effective degradation of minocycline could be reached in the PVDF–PVP–TiO2 fiber mats with a low energy consumption, good separation and, good recovery. Three photocatalytic decomposition pathways of minocycline were proposed: (i) hydroxyl substitution of the acylamino group; (ii) hydroxyl substitution of the amide group, and (iii) a cleavage of the methyl groups and further oxidation of the amino group by OH. Potential risks caused by TP159 and TP99 should not be ignored, while the TP90 are nontoxic. Tests indicated that the toxicity of the photocatalytic process may be persistent if minocycline and its products were not mineralized completely.

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Role of humic substances in the photodegradation of naproxen under simulated sunlight

Cited by 58 publications

References 55 publications

Photodegradation of novel oral anticoagulants under sunlight irradiation in aqueous matrices

Photodegradation of novel oral anticoagulants under sunlight irradiation in aqueous matrices

Separation of Photochemical and Non-Photochemical Diurnal In-Stream Attenuation of Micropollutants

Degradation of Minocycline by the Adsorption–Catalysis Multifunctional PVDF–PVP–TiO2 Membrane: Degradation Kinetics, Photocatalytic Efficiency, and Toxicity of Products

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