Photochemical decomposition of perfluorodecanoic acid in aqueous solution with VUV light irradiation

Wang, B.B.; Cao, Miao; Tan, Zhe; Wang, L.L.; Yuan, Shuiqiao; Chen, Jianjun

doi:10.1016/j.jhazmat.2010.04.115

Cited by 42 publications

(18 citation statements)

References 28 publications

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“…[22] The oxidative activity of the SO 4 À C radical is so high that once formed, the SO 4 À C radical reacts quickly with the substrate regardless of the redox potential of the substrate. Therefore, for this homologous oxidation, the time for the entire transformation process for an equivalent of any substrate, that is, the average conversion rate, definitely depended on the length of the carbon chain of the substrates.…”

Section: Resultsmentioning

confidence: 99%

“…photooxidation is a classic one-electron-oxidation process that takes place through homogenous cleavage of S 2 O 8 2À into the highly active SO 4 À C radical under UV light and is usually used to degrade organic pollutants in water. [22] The oxidative activity of the SO 4 À C radical is so high that once formed, the SO 4 À C radical reacts quickly with the substrate regardless of the redox potential of the substrate. Therefore, for this homologous oxidation, the time for the entire transformation process for an equivalent of any substrate, that is, the average conversion rate, definitely depended on the length of the carbon chain of the substrates.…”

Section: Resultsmentioning

confidence: 99%

“…This activation of S 2 O 8 2À by UV irradiation could be compared with the TiO 2 /UV photocatalysis in which the possible effects of direct photolysis by UV irradiation on the photocatalytic degradation of dicarboxylic acid might be offset. The kinetic studies concerning the photooxidation of dicarboxylic acids by persulfate ion (S 2 O 8 2À ) [22] were also all performed in Pyrex vessels (50 mL) with a solution volume of 50 mL. The initial concentration for all the substrate dicarboxylic acids was 0.5 mm, and the initial concentration of persulfate was 15 mm.…”

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confidence: 99%

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An Unexpected Fluctuating Reactivity for Odd and Even Carbon Numbers in the TiO₂‐Based Photocatalytic Decarboxylation of C2‐C6 Dicarboxylic Acids

Sun¹,

Chang²,

Ji³

et al. 2014

Chemistry A European J

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The degradation behaviours of five straight-chain dicarboxylic acids (from ethanedioic acid to hexanedioic acid) were compared in aqueous TiO2-based photocatalysis. When all other conditions were identical, the degradation rates were found to fluctuate regularly with the parity of the number of carbon atoms. Dicarboxylic acids with an even number of carbon atoms (e-DAs) always degraded more slowly than those acids with an odd number of carbon atoms (o-DAs). This unusual fluctuation in the reactivity for the degradation of dicarboxylic acids by TiO2-based photocatalysis is very closely related to the different pre-coordination modes of the acids with the photocatalyst. Attenuated total reflection FTIR (ATR-FTIR) of e-DAs labelled with (13)C showed that both carboxyl groups of the acid coordinate to TiO2 through bidentate chelating forms. In contrast, only one carboxyl group of the o-DAs coordinated to TiO2 in a bidentate chelating manner, whereas the other formed a monodentate binding linkage. The bidentate chelating form with bilateral symmetric coordination did not favour degradation. Isotope-labelling experiments were performed with (18)O2 to observe the different ways in which incorporated oxygen entered the initial decarboxylated products of e- and o-DAs. For the degradation of butanedioic acid, (45.9±0.5) % of the oxygen in the formed propanedioic acid came from H2O, whereas for pentanedioic acid, (97.4±0.2) % of the oxygen in the formed butanedioic acid came from H2O. Our results demonstrate that in TiO2-based photocatalysis, the reactivity of active species, such as ·OH/h(vb)(+), is far from non-selective and that the attacks of these active species on organic substrates are significantly affected by the coordination patterns of the substrates on the TiO2 surface.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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An Unexpected Fluctuating Reactivity for Odd and Even Carbon Numbers in the TiO₂‐Based Photocatalytic Decarboxylation of C2‐C6 Dicarboxylic Acids

Sun¹,

Chang²,

Ji³

et al. 2014

Chemistry A European J

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“…22 Furthermore, several studies found that the application of sulfate radicals leads to efficient degradation of various organic micropollutants including perfluoroalkyl carboxylic acids (PFCAs; C n F (2n+1) COOH). 8,[23][24][25] Hori et al 23,26 found a substantial decrease of PFCA concentrations when treating contaminated water with photocatalytically activated persulfate while Wang et al 27 showed that F − , CO 2 and small quantities of shorter chain PFCAs were the main reaction products in a similar experiment. Abu Amr et al 28 found an enhanced PFAS removal in landfill leachate for the combination of ozone and persulfate compared to a treatment with ozone only.…”

Section: Introductionmentioning

confidence: 99%

Removal of per- and polyfluoroalkyl substances (PFASs) from tap water using heterogeneously catalyzed ozonation

Franke

Schäfers

Lindberg³

et al. 2019

Environ. Sci.: Water Res. Technol.

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“…2 ) can be produced by irradiation (X/γ-rays [15], vacuum UV [16], electron beams [17]), ultrasound, peroxide thermolysis/photolysis/transition metal activation [18], photosensitization [19], ozone chain decomposition [20], and Fe(CN) [22]. Besides H·/e − aq , another strong reductant carboxyl anion radical (CO •− 2 , −2.0 V) exists.…”

Section: •−mentioning

confidence: 99%

Treatment of Aqueous Bromate by Superparamagnetic BiOCl-Mediated Advanced Reduction Process

et al. 2017

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Bromate (BrO − 3 ) contamination in drinking water is a growing concern. Advanced reduction processes (ARPs) are reportedly promising in relieving this concern. In this work, UV/superparamagnetic BiOCl (BiOCl loaded onto superparamagnetic hydroxyapatite) assisted with small molecule carboxylic acid (formate, citrate, and acetate), a carboxyl anion radical (CO •−2 )-based ARP, was proposed to eliminate aqueous BrO − 3 . Formate and citrate were found to be ideal CO•− 2 precursor, and the latter was found to be safe for practical use. BrO − 3 (10 µg·L −1 , WHO guideline for drinking water) can be completely degraded within 3 min under oxygen-free conditions. In this process, BrO − 3 degradation was realized by the reduction of CO •− 2 (major role) and formyloxyl radical (minor role) in bulk solution. The formation mechanism of radicals and the transformation pathway of BrO − 3 were proposed based on data on electron paramagnetic resonance monitoring, competitive kinetics, and degradation product analysis. The process provided a sustainable decontamination performance (<5% deterioration for 10 cycles) and appeared to be more resistant to common electron acceptors (O 2 , NO − 3 , and Fe 3+ ) than hydrated electron based-ARPs. Phosphate based-superparamagnetic hydroxyapatite, used to support BiOCl in this work, was believed to be applicable for resolving the recycling problem of other metal-containing catalyst.

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Photochemical decomposition of perfluorodecanoic acid in aqueous solution with VUV light irradiation

Cited by 42 publications

References 28 publications

An Unexpected Fluctuating Reactivity for Odd and Even Carbon Numbers in the TiO₂‐Based Photocatalytic Decarboxylation of C2‐C6 Dicarboxylic Acids

An Unexpected Fluctuating Reactivity for Odd and Even Carbon Numbers in the TiO₂‐Based Photocatalytic Decarboxylation of C2‐C6 Dicarboxylic Acids

Removal of per- and polyfluoroalkyl substances (PFASs) from tap water using heterogeneously catalyzed ozonation

Treatment of Aqueous Bromate by Superparamagnetic BiOCl-Mediated Advanced Reduction Process

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Photochemical decomposition of perfluorodecanoic acid in aqueous solution with VUV light irradiation

Cited by 42 publications

References 28 publications

An Unexpected Fluctuating Reactivity for Odd and Even Carbon Numbers in the TiO2‐Based Photocatalytic Decarboxylation of C2‐C6 Dicarboxylic Acids

An Unexpected Fluctuating Reactivity for Odd and Even Carbon Numbers in the TiO2‐Based Photocatalytic Decarboxylation of C2‐C6 Dicarboxylic Acids

Removal of per- and polyfluoroalkyl substances (PFASs) from tap water using heterogeneously catalyzed ozonation

Treatment of Aqueous Bromate by Superparamagnetic BiOCl-Mediated Advanced Reduction Process

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Product

Resources

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An Unexpected Fluctuating Reactivity for Odd and Even Carbon Numbers in the TiO₂‐Based Photocatalytic Decarboxylation of C2‐C6 Dicarboxylic Acids

An Unexpected Fluctuating Reactivity for Odd and Even Carbon Numbers in the TiO₂‐Based Photocatalytic Decarboxylation of C2‐C6 Dicarboxylic Acids