Rate constants of carbonate radical anion reactions with molecules of environmental interest in aqueous solution: A review

Wojnárovits, László; Tóth, Tünde; Takács, Erzsébet

doi:10.1016/j.scitotenv.2020.137219

Cited by 101 publications

(69 citation statements)

References 76 publications

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“…•are around 1 × 10 10 M -1 s -1 , while those of reactions with CO 3 •are in the 2 × 10 6 -5 (Wojnárovits and Takács 2019;Wojnárovits et al 2020). The rate constants increasing in the CO 3…”

Section: Anisolesmentioning

confidence: 92%

“…•and SO 4 •reactions: 3.34±0.47 × 10 7 and 2.72±0.41 × 10 9 M -1 s -1 , respectively (Wojnárovits and Takács 2019;Wojnárovits et al 2020). The trend of the average values reflects the trend of reduction potentials of the oxidants.…”

Section: Tetracycline Antibiotics and Tylosinmentioning

confidence: 96%

“…•reactions (Wojnárovits and Takács 2019; Wojnárovits et al 2020) Due to the three heavy iodine atoms, iopromide is used as a contrast material in the medical practice; k Cl2•-is high, 2.05 ±0.10 × 10 9 M -1 s -1 (Lei et al 2019…”

Section: •-mentioning

confidence: 99%

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Rate constants of dichloride radical anion reactions with molecules of environmental interest in aqueous solution: a review

Wojnárovits

Takács

2021

Environ Sci Pollut Res

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Natural waters, water droplets in the air at coastal regions and wastewaters usually contain chloride ions (Cl-) in relatively high concentrations in the milimolar range. In the reactions of highly oxidizing radicals (e.g., •OH, •NO3, or SO4•-) in the nature or during wastewater treatment in advanced oxidation processes the chloride ions easily transform to chlorine containing radicals, such as Cl•, Cl2•-, and ClO•. This transformation basically affects the degradation of organic molecules. In this review about 400 rate constants of the dichloride radical anion (Cl2•-) with about 300 organic molecules is discussed together with the reaction mechanisms. The reactions with phenols, anilines, sulfur compounds (with sulfur atom in lower oxidation state), and molecules with conjugated electron systems are suggested to take place with electron transfer mechanism. The rate constant is high (107–109 M-1 s-1) when the reduction potential the one-electron oxidized species/molecule couple is well below that of the Cl2•-/2Cl- couple.

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Section: Anisolesmentioning

confidence: 92%

Section: Tetracycline Antibiotics and Tylosinmentioning

confidence: 96%

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Rate constants of dichloride radical anion reactions with molecules of environmental interest in aqueous solution: a review

Wojnárovits

Takács

2021

Environ Sci Pollut Res

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“…proposed by an earlier study (Onori and Santucci, 1996), if the water in the SOA-mimicking solutions exists in two forms, bulk and hydrating, the micro-heterogeneities may interact with water/nitrate matrix to sequester the reactants and products, concentrating them within a smaller effective solvent volume and consequently resulting in increased normalized abundance of products (Berke et al, 2019). (Gen et al, 2019b), the increased normalized abundance of products may be due to other reactions promoted by the carbonate radical (CO3 •-), which can be generated from the reactions of bicarbonate/carbonate with • OH (Reactions 18 and 19; Table 1) (Neta et al, 1988;Wojnárovits et al, 2020) or 3 VL* (Reactions 20 and 21; Table 1) (Canonica et al, 2005). CO3 •is a selective oxidant that reacts with organic molecules at a lower rate than • OH and readily reacts with electron-rich parts of phenols, aromatic amines, and sulfur-containing compounds (e.g., glutathione) through both electron transfer and H-abstraction (Huang and Mabury, 2000;Wojnárovits et al, 2020).…”

Section: Effect Of Vocs and Inorganic Anionsmentioning

confidence: 99%

“…(Gen et al, 2019b), the increased normalized abundance of products may be due to other reactions promoted by the carbonate radical (CO3 •-), which can be generated from the reactions of bicarbonate/carbonate with • OH (Reactions 18 and 19; Table 1) (Neta et al, 1988;Wojnárovits et al, 2020) or 3 VL* (Reactions 20 and 21; Table 1) (Canonica et al, 2005). CO3 •is a selective oxidant that reacts with organic molecules at a lower rate than • OH and readily reacts with electron-rich parts of phenols, aromatic amines, and sulfur-containing compounds (e.g., glutathione) through both electron transfer and H-abstraction (Huang and Mabury, 2000;Wojnárovits et al, 2020). Similar to IPA, the enhancement of normalized abundance of products (VL+AN+NaBC: 4.3 times vs. VL*+NaBC: 1.4 times; Table S2) and <OSc> (VL+AN+NaBC: -0.13 to 0.08 vs.…”

Section: Effect Of Vocs and Inorganic Anionsmentioning

confidence: 99%

Aqueous SOA formation from the photo-oxidation of vanillin: Direct photosensitized reactions and nitrate-mediated reactions

Mabato

Lyu

et al. 2021

Preprint

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Abstract. Vanillin (VL), a phenolic aromatic carbonyl abundant in biomass burning emissions, forms triplet excited states (3VL*) under simulated sunlight leading to aqueous secondary organic aerosol (aqSOA) formation. This direct photosensitized oxidation of VL was compared with nitrate-mediated VL photo-oxidation under atmospherically relevant cloud and fog conditions, through examining the VL decay kinetics, product compositions, and light absorbance changes. The majority of the most abundant products from both VL photo-oxidation pathways were potential Brown carbon (BrC) chromophores. In addition, both pathways generated oligomers, functionalized monomers, and oxygenated ring-opening products, but nitrate promoted functionalization and nitration, which can be ascribed to its photolysis products (•OH, •NO2, and N(III), NO2- or HONO). Moreover, a potential imidazole derivative observed from nitrate-mediated VL photo-oxidation suggested that ammonium may be involved in the reactions. The effects of secondary oxidants from 3VL*, pH, the presence of volatile organic compounds (VOCs) and inorganic anions, and reactants concentration and molar ratios on VL photo-oxidation were also explored. Our findings show that the secondary oxidants (1O2, O2•-/•HO2, •OH) from the reactions of 3VL* and O2 play an essential role in VL photo-oxidation. Enhanced oligomer formation was noted at pH < 4 and in the presence of VOCs and inorganic anions, probably due to additional generation of radicals (•HO2 and CO3•-). Also, functionalization was dominant at low VL concentration, whereas oligomerization was favored at high VL concentration. Furthermore, guaiacol oxidation by photosensitized reactions of VL was observed to be more efficient relative to nitrate-mediated photo-oxidation. Lastly, potential VL photo-oxidation pathways under different reaction conditions were proposed. This study indicates that the direct photosensitized oxidation of VL, which nitrate photolysis products can further enhance, may be an important aqSOA source in areas influenced by biomass burning emissions.

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Enhanced degradation of emerging contaminants by percarbonate/Fe(II)-ZVI process: case study with nizatidine

Huo

Zou

Lin

et al. 2023

Environ Sci Pollut Res

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Rate constants of carbonate radical anion reactions with molecules of environmental interest in aqueous solution: A review

Cited by 101 publications

References 76 publications

Rate constants of dichloride radical anion reactions with molecules of environmental interest in aqueous solution: a review

Rate constants of dichloride radical anion reactions with molecules of environmental interest in aqueous solution: a review

Aqueous SOA formation from the photo-oxidation of vanillin: Direct photosensitized reactions and nitrate-mediated reactions

Enhanced degradation of emerging contaminants by percarbonate/Fe(II)-ZVI process: case study with nizatidine

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