Effects of climate change on surface-water photochemistry: a review

Laurentiis, Elisa De; Minella, Marco; Maurino, Valter; Minero, Claudio; Vione, Davide

doi:10.1007/s11356-013-2343-0

Cited by 15 publications

(7 citation statements)

References 65 publications

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“…This rise in pH may be related to two effects: (i) an effect on the carbonate equilibrium in aqueous media caused by agitation and temperature increase, generating a loss of CO 2 in the medium , being consistent with the results in photo‐Fenton treatment of groundwater , and (ii) CO 3 2− ions can react with photo‐induced

\cdot OH

radicals yielding radical

{CO}_{3}^{- \cdot}

, which can also attack organic matter, oxidizing it or leading to CO 2 and H 2 O 2 formation. Both processes are likely to be responsible for pH increasing .

{CO}_{3}^{2 -} + \cdot OH \to {OH}^{-} + {CO}_{3}^{- \cdot}

2 {CO}_{3}^{- \cdot} + 2 {normalH}^{+} \to 2 {CO}_{2} + {normalH}_{2} {normalO}_{2}

{CO}_{3}^{- \cdot} + OM \to {OM}_{ox} + {CO}_{3}^{2 -}

…”

Section: Resultsmentioning

confidence: 99%

Addition of Hydrogen Peroxide to Groundwater with Natural Iron Induces Water Disinfection by Photo‐Fenton at Circumneutral pH and other Photochemical Events

Gutiérrez‐Zapata

Alvear‐Daza

Rengifo‐Herrera

et al. 2017

Photochem & Photobiology

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Samples of natural groundwater (with low turbidity, neutral pH and 0.3 mg L iron concentration) inoculated with Escherichia coli K-12 were exposed to simulated solar light both in the presence and in the absence 10 mg L of H O Results demonstrated that the viability of E. coli (by DVC-FISH) was grounded to zero after 360 min of irradiation. This abatement could be caused by the oxidative stress induced by ·OH radicals or another photo-induced reactive oxygen species. Two 2 factorial experimental designs enabled the evaluation of the effects of chemical factors on the inactivation of E. coli. The first experimental design considered the pH, iron and H O , while the second evaluated the ions fluoride, carbonate and phosphate found in groundwater. pH was found to play a key role in the inactivation of E. coli. The best reduction in viability was obtained at the lower pH (6.75), while a nonsignificant effect was observed when iron or H O concentrations were raised. At higher concentrations, anions, such as carbonate and phosphate, negatively affected the E. coli abatement. However, a higher concentration of fluoride accelerated it. In all experiments, the pH was observed to rise to values higher than 8.0 units after 360 min of treatment.

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\cdot OH

radicals yielding radical

{CO}_{3}^{- \cdot}

, which can also attack organic matter, oxidizing it or leading to CO 2 and H 2 O 2 formation. Both processes are likely to be responsible for pH increasing .

{CO}_{3}^{2 -} + \cdot OH \to {OH}^{-} + {CO}_{3}^{- \cdot}

2 {CO}_{3}^{- \cdot} + 2 {normalH}^{+} \to 2 {CO}_{2} + {normalH}_{2} {normalO}_{2}

{CO}_{3}^{- \cdot} + OM \to {OM}_{ox} + {CO}_{3}^{2 -}

…”

Section: Resultsmentioning

confidence: 99%

Addition of Hydrogen Peroxide to Groundwater with Natural Iron Induces Water Disinfection by Photo‐Fenton at Circumneutral pH and other Photochemical Events

Gutiérrez‐Zapata

Alvear‐Daza

Rengifo‐Herrera

et al. 2017

Photochem & Photobiology

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“…These genes encode dioxygenases, the main enzymes that participate in aerobic degradation of aromatic compounds. In the presence of dioxygenases, 2,4-D is transformed to 2,4-dichlorophenol (de Lipthay et al 2002). The quantitative and qualitative composition of aquatic microflora is modified by its exposure to mixtures of herbicides.…”

Section: Biodegradationmentioning

confidence: 99%

Occurrence and transformation of phenoxy acids in aquatic environment and photochemical methods of their removal: a review

Muszyński

Brodowska

Paszko

2019

Environ Sci Pollut Res

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The article presents the behavior of phenoxy acids in water, the levels in aquatic ecosystems, and their transformations in the water environment. Phenoxy acids are highly soluble in water and weakly absorbed in soil. These highly mobile compounds are readily transported to surface and groundwater. Monitoring studies conducted in Europe and in other parts of the world indicate that the predominant phenoxy acids in the aquatic environment are mecoprop, 4-chloro-2-methylphenoxyacetic acid (MCPA), dichlorprop, 2,4-dichlorophenoxyacetic acid (2,4-D), and their metabolites which are chlorophenol derivatives. In water, the concentrations of phenoxy acids are effectively lowered by hydrolysis, biodegradation, and photodegradation, and a key role is played by microbial decomposition. This process is determined by the qualitative and quantitative composition of microorganisms, oxygen levels in water, and the properties and concentrations of phenoxy acids. In shallow and highly insolated waters, phenoxy acids can be decomposed mainly by photodegradation whose efficiency is determined by the form of the degraded compound. Numerous studies are underway on the use of advanced oxidation processes (AOPs) to remove phenoxy acids. The efficiency of phenoxy acid degradation using AOPs varies depending on the choice of oxidizing system and the conditions optimizing the oxidation process. Most often, methods combining UV radiation with other reagents are used to oxidize phenoxy acids. It has been found that this solution is more effective compared with the oxidation process carried out using only UV.

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“…Another approach, which has not extensively explored towards removal of organic pollutants, is using photo-Fenton processes under natural conditions. Some authors have argued that natural surface waters irradiated with sunlight may promote low concentrations of HO • radicals through several photochemical processes, mainly photo-Fenton reaction with natural iron and H 2 O 2 concentrations (Millero and Sotolongo 1989;Nakatani et al 2007;De Laurentiis et al 2014;Gligorovski et al 2015). Sciacca et al (Sciacca et al 2010) published for the first time that simple adding of 10.0 mg L −1 of hydrogen peroxide to natural Sahelian surface waters containing 0.3 mg L −1 of total iron led to the E. coli and Salmonella inactivation under natural sunlight irradiation demonstrating that H 2 O 2 could enhance natural photochemical events including photo-Fenton.…”

Section: Introductionmentioning

confidence: 99%

Photo-Fenton process at natural conditions of pH, iron, ions, and humic acids for degradation of diuron and amoxicillin

Buitrago

Sanabria

Gutiérrez‐Zapata

et al. 2019

Environ Sci Pollut Res

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Effect of ferric ions at concentrations typically found in natural waters (0.05 to 1.06 mg L −1 ) and low H 2 O 2 concentrations (between 0.5 and 17.9 mg L −1 ) on simulated sunlight-induced (300 W m −2 ) photo-Fenton degradation at initial neutral pH (7.0) of amoxicillin and diuron in Milli-Q water was studied using an rotatable central composite experimental design 2 2 with a central and two axial points. H 2 O 2 concentration was the parameter playing the key role on the degradation of both pollutants. Despite that initial pH was 7.0 in Milli-Q water, this latter decreased rapidly in the first minutes, reaching values of 3.5 and 5.0 for diuron and amoxicillin respectively after 15 min of simulated sunlight irradiation. In contrast, in presence of bicarbonate/carbonate (HCO 3), fluoride (F − ), and humic acids (HAs) at concentrations found often in surface and well waters with ferric ion and H 2 O 2 concentrations of 0.3 and 9.7 and 15.2 mg L −1 respectively, both pollutants exhibited a strong degradation keeping the circumneutral pH. Amoxicillin and diuron degradation byproducts found by HPLC/MS were compatible with HO • and/or CO 3 -• radical attack. Several photo-induced processes such as photo-Fenton (by dissolved ferric-HA complexes), heterogeneous photocatalysis (by colloidal iron), UV-B H 2 O 2 photolysis, irradiated-dissolved organic matter, and their reactions with pollutants would be the main oxidative route responsible of degradations. These findings demonstrated that it could be possible using iron concentrations often found in natural waters to oxidize via photo-Fenton processes among other events, organic pollutants at natural pH conditions.Keywords Circumneutral photo-Fenton . Diuron . Amoxicillin . H 2 O 2 photolysis . Water detoxification . Low iron amounts * Paula Osorio-Vargas

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Effects of climate change on surface-water photochemistry: a review

Cited by 15 publications

References 65 publications

Addition of Hydrogen Peroxide to Groundwater with Natural Iron Induces Water Disinfection by Photo‐Fenton at Circumneutral pH and other Photochemical Events

Addition of Hydrogen Peroxide to Groundwater with Natural Iron Induces Water Disinfection by Photo‐Fenton at Circumneutral pH and other Photochemical Events

Occurrence and transformation of phenoxy acids in aquatic environment and photochemical methods of their removal: a review

Photo-Fenton process at natural conditions of pH, iron, ions, and humic acids for degradation of diuron and amoxicillin

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