Degradation of emerging contaminants from water under natural sunlight: The effect of season, pH, humic acids and nitrate and identification of photodegradation by-products

Koumaki, Elena; Mamais, Daniel; Noutsopoulos, Constantinos; Nika, Maria‐Christina; Bletsou, Anna A.; Thomaidis, Nikolaos S.; Eftaxias, Alexander; Stratogianni, Georgia

doi:10.1016/j.chemosphere.2015.07.033

Cited by 99 publications

(28 citation statements)

References 20 publications

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“…Increasing the initial concentrations of EE2 were significantly inhibited the photodegradation of EE2. In natural waters, the EE2 is commonly detected at sub-ng L -1 level or below [14]. Thus, the photodegradation half-life for EE2 in natural surface waters should be shorter than that discussed in this study.…”

Section: A2 Effect Of Initial Concentration Of Ee2mentioning

confidence: 73%

Photodegradation of 17α-Ethynylestradiol (EE2) in the Presence of Humic Acid and Carbonate Ions in Water Solutions

Albalawi¹,

Zuo²

2018

IJCEA

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The concerns over 17α-ethynylestradiol (EE2) have been growing in the recent years due to its increasing presence in the environment and its high estrogenic potency. However, there is a limited amount of research available on the photochemical behaviors of EE2 in the presence of various aquatic environmental matrix components even though photodegradation has been considered an effective pathway for the removal of organic pollutants from not only waste waters but also natural aquatic ecosystems. Herein, the direct photodegradation of EE2 and the effects of common natural water matrix components, humic acid and carbonate ions, on the photodegradation were studied. High-Performance Liquid Chromatography (HPLC) was utilized to determine the concentrations of EE2. The direct photodegradation of EE2 was found to increase with increasing water pH value in the range of 7.0 to 10.0 and the photodegradation rate constant increased with increasing concentration of EE2. Humic acid enhanced the photodegaradation rate of EE2 under the simulated sunlight employed, while carbonate (CO 3 2-/HCO 3 −) had shown slight influences on EE2 photodegradation.

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Section: A2 Effect Of Initial Concentration Of Ee2mentioning

confidence: 73%

Photodegradation of 17α-Ethynylestradiol (EE2) in the Presence of Humic Acid and Carbonate Ions in Water Solutions

Albalawi¹,

Zuo²

2018

IJCEA

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“…Similar observation was reported by Habibi et al . who studied the application of magnetically separable graphitic carbon nitride; silver phosphate and silver chloride for photocatalytic removal of different pollutants using visible light irradiation . Mohamed et al .…”

Section: Resultsmentioning

confidence: 99%

Visible Light Degradation of Naproxen by Enhanced Photocatalytic Activity of NiO and NiS, Scavenger Study and Focus on Catalyst Support and Magnetization

Torki

Faghihian

2018

Photochem & Photobiology

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This research was aimed to prepare a magnetically photocatalyst enabling to degrade pharmaceutical wastewater and detoxification of pollutant such as naproxen, by visible light irradiation. The nano-sized NiS and NiO photocatalysts exhibit higher reactivity than their microsized counterparts, but separation of the used photocatalyst from the degradation solution is hard and imperfect. To remove this difficulty, magnetic polypyrrole core-shell (Fe O @PPY) was synthesized and employed as catalyst support. The magnetization property of the synthesized photocatalysts measured by VSM technique indicated that the photocatalysts were sufficiently magnetized to be readily separated from degradation solution by use of external magnetic field. The DRS study showed that the band gap of the photocatalysts shifted to lower energy after immobilization on the support materials leading to higher degradation efficiency. The optimal efficiency was obtained with the catalysts loaded with 50% of NiO and 50% of NiS. The augmenting effect of H O and the inhibition influence of some organic and inorganic compounds on the degradation process were studied. Regeneration of the used photocatalyst was performed by heat treatment, and the catalyst treated at 400°C retained most of its initial capacity. The degradation capacity was kinetically fast, and the equilibrium was attained within 30 min.

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“…Among the various environmental parameters affecting degradation reactions are aerobic-anaerobic conditions, humic compounds and other organic material in water, nitrate concentration, and pH (Lahti and Oikari 2011 ; Fatta-Kassinos et al 2011 ; Andreozzi et al 2002 ; Koumaki et al 2015 ). To avoid unmanageable complexity, these were ignored in the reaction rate setup.…”

Section: Methodsmentioning

confidence: 99%

“…However, the reaction rates were temperature corrected as described by Sinkkonen and Paasivirta ( 2000 ). While Koumaki et al ( 2015 ) and Koumaki et al ( 2017 ) have estimated photolysis to be an important pharmaceutical degradation path, their measurements were done in accordance to OECD guideline 316 ( 2008 ), which represents photolysis in the surface layer of water only. However, Bartels and von Tümpling ( 2007 ) have reported the diminishing effect of depth on photolysis.…”

Section: Methodsmentioning

confidence: 99%

A fugacity model assessment of ibuprofen, diclofenac, carbamazepine, and their transformation product concentrations in an aquatic environment

Nurmi

Kiljunen

Knuutinen

2018

Environ Sci Pollut Res

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An updated version of FATEMOD, a multimedia fugacity model for environmental fate of organic chemicals, was set up to assess environmental behaviour of three pharmaceuticals in northern Lake Päijänne, Finland. Concentrations of ibuprofen, diclofenac, and carbamazepine were estimated at various depths at two sites: near a wastewater treatment plant and 3.5 km downstream the plant. When compared with environmental sampling data from corresponding depths and sites, the predicted concentrations, ranging from nanograms to hundreds of nanograms per litre, were found to be in good agreement. Weather data were utilised with the model to rationalise the effects of various environmental parameters on the sampling results, and, e.g. the roles of various properties of lake dynamics and photodegradation were identified. The new model also enables simultaneous assessment of transformation products. Environmentally formed transformation product concentrations were estimated to be at highest an order of magnitude lower than those of the parent compounds, and unlikely to reach a detectable level. However, a possibility that conjugates of ibuprofen are present at higher levels than the parent compound was identified. Simulation results suggest that environmental degradation half-lives of the inspected contaminants under stratified lake conditions are in the range of some weeks to months.

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Degradation of emerging contaminants from water under natural sunlight: The effect of season, pH, humic acids and nitrate and identification of photodegradation by-products

Cited by 99 publications

References 20 publications

Photodegradation of 17α-Ethynylestradiol (EE2) in the Presence of Humic Acid and Carbonate Ions in Water Solutions

Photodegradation of 17α-Ethynylestradiol (EE2) in the Presence of Humic Acid and Carbonate Ions in Water Solutions

Visible Light Degradation of Naproxen by Enhanced Photocatalytic Activity of NiO and NiS, Scavenger Study and Focus on Catalyst Support and Magnetization

A fugacity model assessment of ibuprofen, diclofenac, carbamazepine, and their transformation product concentrations in an aquatic environment

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