Photodegradation kinetics and transformation products of ketoprofen, diclofenac and atenolol in pure water and treated wastewater

Salgado, Ricardo; Pereira, Vanessa J.; Carvalho, Gilda; Soeiro, R.; Gaffney, Vanessa de Jesus; Almeida, Cristina; Cardoso, Vítor Vale; Ferreira, Elisabete; Benoliel, Maria João; Ternes, Thomas A.; Oehmen, Adrian; Reis, Maria A.M.; Noronha, João Paulo

doi:10.1016/j.jhazmat.2012.10.039

Cited by 172 publications

(89 citation statements)

References 25 publications

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“…The extinction coefficient for DCF at 274 nm (e 274nm ) in water was calculated to be 13 340 M Àl cm Àl . [39] Direct photolysis using an immersion-well equipped with a MP mercury lamp Photolysis of DCF solutions at initial concentrations ranging between 10 and 60 mg L À1 was investigated. The levels chosen for the photolysis study were higher than the typical background concentration of DCF present in the environment, however, this strategy allowed for the detection and identification of photodegradants without pre-concentration.…”

Section: Resultsmentioning

confidence: 99%

“…[40] In contrast to the rapid [41] A recent study also reported a high degradation rate for DCF on UV irradiation, emitted from a MP mercury lamp. [39] Another study, however, reported an insignificant degradation efficiency upon direct photolysis. [34] These somewhat contradictory results may be attributed to differences in the radiation intensity from the chosen light sources and variations in the water matrices.…”

Section: Resultsmentioning

confidence: 99%

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Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors

Kanakaraju¹,

Cherie²,

Motti³

et al. 2014

Environ. Chem.

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Environmental context. Diclofenac, a common non-steroidal anti-inflammatory drug, is not completely removed from surface and drinking water by conventional treatment methods. Consequently, this drug is present in the aquatic environment and has been subsequently linked to toxic effects on organisms. We show that photolysis and TiO 2 -catalysed degradation in circulating batch reactors efficiently results in diclofenac removal under a variety of conditions. These photochemical methods thus may lead to more effective water treatment processes.Abstract. The occurrence of diclofenac (DCF) as an emerging pollutant in surface waters and drinking water has been attributed to elevated global consumption and the inability of sewage treatment plants to remove DCF. In this study, DCF spiked drinking water and river water was subjected to photolysis and TiO 2 photocatalytic treatments in a circulating laboratory-scale (immersion-well) and a demonstration-scale loop reactor (Laboclean). The operational parameters for the immersion-well reactor were optimised as follows: TiO 2 P25 loading, 0.1 g L À1 ; natural pH, 6.2; initial concentration, 30 mg L À1 ; water type, distilled water. Complete DCF removal was realised within 15 min under the optimised conditions using the immersion-well reactor. Sunlight-mediated photochemical degradation required a prolonged exposure period of up to 360 min for complete DCF removal. DCF in distilled and drinking water was efficiently degraded in the larger Laboclean reactor. Differences were, however, observed based on their pseudo-first-order rate constants, which implies that the water matrix has an effect on the degradation rate. Six major photoproducts, 2-(8-chloro-9H-carbazol-1-yl)acetic acid, 2-(8-hydroxy-9H-carbazol-1-yl)acetic acid, 2,6-dichloro-N-o-tolylbenzenamine, 2-(phenylamino)benzaldehyde, 1-chloromethyl-9H-carbazole and 1-methyl-9H-carbazole, generated from TiO 2 photocatalysis of DCF were identified by liquid chromatography-mass spectrometry (LCMS) and Fourier transform-ion cyclotron resonance-mass spectrometry (FT-ICR-MS). This work has shown that photocatalytic degradation kinetics of DCF are dependent on both the geometry of the photoreactor and the nature of the water matrices.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors

Kanakaraju¹,

Cherie²,

Motti³

et al. 2014

Environ. Chem.

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“…Low pressure UV lamps used for disinfection are monochromatic and emit light at a wavelength of 254 nm, which cause DNA damage of microorganisms present in water. Photodegradation of a compound is only possible when the compound is able to absorb light at the wavelength to which it is exposed [15]. Since not all compounds absorb light at 254 nm efficiently, the alternative would be to use medium or high pressure polychromatic lamps, which emit a radiation of a broad wavelength range, but use more energy.…”

Section: Bta Was Found In the Effluent Of Wastewater Treatment Plantsmentioning

confidence: 99%

“…Several types of reactions occur in the UV/H 2 O 2 system and their reaction rates may be presented by the following equations (13)(14)(15)(16)(17)(18) [37,38]:…”

Section: Kinetic Studymentioning

confidence: 99%

Oxidation of benzotriazole and benzothiazole in photochemical processes: Kinetics and formation of transformation products

Borowska

Felis

Kalka

2016

Chemical Engineering Journal

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“…As the degradation rate of the organic compound is proportional to its quantum yield [32], experiments were then carried out to determine the quantum yield of chlortoluron. The good linear fits (R 2 = 0.988) of k obs and I 0 during chlortoluron irradiation suggests that the quantum yield can be calculated by Eq.…”

Section: Chlortoluron Degradation During Uv Irradiationmentioning

confidence: 99%

Degradation of chlortoluron during UV irradiation and UV/chlorine processes and formation of disinfection by-products in sequential chlorination

Guo

Lin

et al. 2016

Chemical Engineering Journal

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Photodegradation kinetics and transformation products of ketoprofen, diclofenac and atenolol in pure water and treated wastewater

Cited by 172 publications

References 25 publications

Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors

Photolysis and TiO2-catalysed degradation of diclofenac in surface and drinking water using circulating batch photoreactors

Oxidation of benzotriazole and benzothiazole in photochemical processes: Kinetics and formation of transformation products

Degradation of chlortoluron during UV irradiation and UV/chlorine processes and formation of disinfection by-products in sequential chlorination

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