Transformation kinetics of biochemically active compounds in low-pressure UV Photolysis and UV/H2O2 advanced oxidation processes

Baeza, Carolina; Knappe, Detlef R.U.

doi:10.1016/j.watres.2011.05.039

Cited by 177 publications

(67 citation statements)

References 30 publications

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“…Ammonium acetate in methanol (A, 5 mM) and Milli-Q water (B) were used as the mobile phases with a total flow rate of 0.3 mL min À1 . The gradient elution program (time in min, % mobile phase A) was set as follows: (0, 50), (1,50), (16,100), (20,100), (24,50), and (28,50). A Triple Quadrupole Detector (Waters, Milford, MA, USA), equipped with an electrospray ionization source and operated in the positive ion mode, was employed to detect the target OPEs.…”

Section: Methodsmentioning

confidence: 99%

“…Compared with other advanced treatments such as Fenton's regent oxidation, membrane filtration and activated carbon adsorption, ozone and UV/H 2 O 2 have no requirement for pH adjustment, sludge disposal, membrane backwash, or adsorbent regeneration, thus are commonly applied for water and wastewater treatment [12,14]. In addition, water matrix, especially the type and content of natural organic or inorganic matter, can affect the oxidation of organic pollutants by competing for the oxidant and/or affecting the generation of Å OH [15][16][17]. However, there is little research concerning the effect of water matrix on the removal of OPEs in ozone and UV/H 2 O 2 treatments.…”

Section: Introductionmentioning

confidence: 99%

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Removal of organophosphate esters from municipal secondary effluent by ozone and UV/H2O2 treatments

Yuan

Lacorte

Cristale

et al. 2015

Separation and Purification Technology

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a b s t r a c tOrganophosphate esters (OPEs) have emerged as a new class of contaminants due to their massive use as flame retardants and plasticizers. These contaminants are toxic to aquatic organisms and some of them are not biodegradable in wastewater treatment plants. This study investigated the degradation kinetics of eight typical OPEs during ozone and UV/H 2 O 2 treatments in Milli-Q water, humic acid (HA) solution, and municipal secondary effluent. The studied OPEs included three chlorinated: tris(2-chloroethyl) phosphate (TCEP), tris(chloropropyl) phosphate (TCPP) and tris(dichloropropyl) phosphate (TDCP); two aromatic: triphenyl phosphate (TPhP) and tricresyl phosphate (TCrP); and three aliphatic: tri-n-butyl phosphate (TnBP), tris(2-butoxyethyl) phosphate (TBEP), and tris(2-ethylhexyl) phosphate (TEHP). Results indicate that the degradation of target OPEs conformed to the pseudo-first-order kinetics and UV/H 2 O 2 was more effective than ozone for their elimination by comparing the overall removal efficiencies and energy consumptions. Two aromatic and two aliphatic OPEs (i.e., TPhP, TCrP, TnBP and TBEP) were effectively degraded by ozone and UV/H 2 O 2 in the test water matrices, while all chlorinated and one aliphatic OPEs (i.e., TCEP, TCPP, TDCP and TEHP) were found to be recalcitrant to oxidation. Moreover, the presence of HA significantly enhanced the degradation of reactive OPEs in ozone treatment.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Removal of organophosphate esters from municipal secondary effluent by ozone and UV/H2O2 treatments

Yuan

Lacorte

Cristale

et al. 2015

Separation and Purification Technology

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“…The degradation of DCF has been investigated both under direct photolysis [26][27][28][29] and by TiO 2 photocatalysis. [13,[30][31][32][33][34] Existing studies describing photolysis either in the laboratory or in the natural environment using sunlight have reported direct photolysis as the main depletion mechanism for DCF.…”

Section: Introductionmentioning

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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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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“…The anionic form of some micropollutants were reported to exhibit higher degradation rates than the neutral form [26,40]. The influ-ence of freshwater pH on the photodegradation of compounds, and by extension on the ecotoxicological impacts, is unclear in the present study.…”

Section: Resultsmentioning

confidence: 61%

“…In the present study, averwhere pKa is the negative logarithm (log10) of the dissociation constant, f is KOW,n/(KOW,n + 1), and fn is the fraction of neutral molecules according to the Henderson-Hasselbalch equation: 1 age full day direct photolyis rates for winter and summer seasons were calculated by GCSOLAR [20]. Experimental molar absorption coefficients in function of the UV/VIS wavelength range (εA, in l mol −1 cm −1 ) were gathered in the literature [19,[21][22][23][24][25][26][27][28] as well…”

Section: Partition Coefficientsmentioning

confidence: 99%

Accounting for the dissociating properties of organic chemicals in LCIA: An uncertainty analysis applied to micropollutants in the assessment of freshwater ecotoxicity

Morais

Delerue–Matos

Gabarrell

2013

Journal of Hazardous Materials

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In life cycle impact assessment (LCIA) models, the sorption of the ionic fraction of dissociating organic chemicals is not adequately modeled because conventional non-polar partitioning models are applied. Therefore, high uncertainties are expected when modeling the mobility, as well as the bioavailability for uptake by exposed biota and degradation, of dissociating organic chemicals. Alternative regressions that account for the ionized fraction of a molecule to estimate fate parameters were applied to the USEtox model. The most sensitive model parameters in the estimation of ecotoxicological characterization factors (CFs) of micropollutants were evaluated by Monte Carlo analysis in both the default USEtox model and the alternative approach. Negligible differences of CFs values and 95% confidence limits between the two approaches were estimated for direct emissions to the freshwater compartment; however the default USEtox model overestimates CFs and the 95% confidence limits of basic compounds up to three orders and four orders of magnitude, respectively, relatively to the alternative approach for emissions to the agricultural soil compartment. For three emission scenarios, LCIA results show that the default USEtox model overestimates freshwater ecotoxicity impacts for the emission scenarios to agricultural soil by one order of magnitude, and larger confidence limits were estimated, relatively to the alternative approach.

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Transformation kinetics of biochemically active compounds in low-pressure UV Photolysis and UV/H2O2 advanced oxidation processes

Cited by 177 publications

References 30 publications

Removal of organophosphate esters from municipal secondary effluent by ozone and UV/H2O2 treatments

Removal of organophosphate esters from municipal secondary effluent by ozone and UV/H2O2 treatments

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

Accounting for the dissociating properties of organic chemicals in LCIA: An uncertainty analysis applied to micropollutants in the assessment of freshwater ecotoxicity

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