Removal of hydroxylamine by processes generating OH radicals in aqueous solution

Leitner, Nathalie Karpel Vel; Berger, P.; Dutois, Guillaume; Légube, B.

doi:10.1016/s1010-6030(99)00191-4

Cited by 17 publications

(13 citation statements)

References 7 publications

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“…In addition, some researchers have proposed that the protonated form of NH 2 O • , the one-electron transfer intermediate of HA with a p K a1 of about 4.2, reacts much faster with H 2 O 2 than the unprotonated NH 2 O • to produce HO • . 35 Under acidic conditions, most of the NH 2 O • are protonated, and thus the HO • production increases with decreasing pH. Moreover, another factor controlled by the pH is the activity of Ce(IV).…”

Section: Resultsmentioning

confidence: 99%

“…It has been reported that the reaction rate between HO • with H 2 NOH is faster than that between HO • with H 3 NOH + via reactions and , respectively. In addition, some researchers have proposed that the protonated form of NH 2 O • , the one-electron transfer intermediate of HA with a p K a1 of about 4.2, reacts much faster with H 2 O 2 than the unprotonated NH 2 O • to produce HO • . Under acidic conditions, most of the NH 2 O • are protonated, and thus the HO • production increases with decreasing pH.…”

Section: Resultsmentioning

confidence: 99%

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Decolorization and Mineralization of Rhodamine B in Aqueous Solution with a Triple System of Cerium(IV)/H₂O₂/Hydroxylamine

et al. 2018

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Hydroxylamine (HA) can react with hydrogen peroxide (H 2 O 2 ) to generate hydroxyl radical (HO • ), but the reaction rate between them is very slow (2.2 × 10 –4 M –1 s –1 ). We propose a new system to accelerate the formation of aminoxyl radical (NH 2 O • ) by the addition of cerium [Ce(IV)] to induce the continuous production of HO • through reaction with H 2 O 2 . We also investigate the decolorization and mineralization of rhodamine B (RhB) and mechanism in the Ce(IV)/H 2 O 2 /HA system. The initial pH plays a significant role in decolorization of RhB. In this work, observation of the rapid decolorization process after 60 min revealed that approximately 80% of RhB was degraded at the initial pH of 4.0. The HO • radicals were considered as the primary reactive oxidant in the system, during its investigation through coumarin capturing, benzoic acid capturing, and radical quenching experiments. The results of the present study suggest that the addition of Ce(IV) can greatly enhance the production of HO • , and the rapid decolorization and mineralization of RhB can occur through the Ce(IV)/H 2 O 2 /HA system at acidic pH conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Decolorization and Mineralization of Rhodamine B in Aqueous Solution with a Triple System of Cerium(IV)/H₂O₂/Hydroxylamine

et al. 2018

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“…Researchers have reported that photodecomposition of dichloramine did not produce significant amounts of nitrate and nitrogen dioxide in the absence of oxygen, but production increased under saturated oxygen conditions (Leitner et al, 1999;De Laat et al, 2010). This suggests that insufficient oxygen in solutions may inhibit UV/titanium dioxide activity, resulting in a lower hydroxide radical concentration and decreasing the degree of mineralization (particularly at a lower pH).…”

Section: Resultsmentioning

confidence: 99%

Carbamazepine Degradation by Photolysis and Titanium Dioxide Photocatalysis

Son

Kang

et al. 2012

Water Environment Research

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We investigated the degradation of carbamazepine by photolysis/ultraviolet (UV)-C only and titanium dioxide photocataiysis. The degradation of carbamazepine by UV-only and titanium-dioxideonly (adsorption) reactions were inefficient, however, complete degradation of carbamazepine was observed by titanium dioxide photocataiysis within 30 min. The rate of degradation increased as initial carbamazepine concentration decreased, and the removal i

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“…Hydroxylamine (HA), a widely used reductant and antioxidant, contains an ionizable hydroxyl moiety and can undergo electron transfer or H atom abstraction. − Previous work in our laboratory has indicated that it can accelerate Fe(II)/Fe(III) redox cycles to enhance the generation of reactive radicals dramatically in a Fenton system or an Fe(II)/peroxymonosulfate system. , Considering its similar reducing activity and the ionizable hydroxyl group, it is hypothesized that HA may activate H 2 O 2 to form HO· without a transition metal. Radical species are very probably produced as intermediates in the electron transfer process between H 2 O 2 and HA, though the mechanism of HO· production involving HA and H 2 O 2 is still unknown.…”

Section: Introductionmentioning

confidence: 99%

Production of Hydroxyl Radical via the Activation of Hydrogen Peroxide by Hydroxylamine

Chen

Zhang

et al. 2015

Environ. Sci. Technol.

155

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The production of the hydroxyl radical (HO·) is important in environmental chemistry. This study reports a new source of HO· generated solely from hydrogen peroxide (H2O2) activated by hydroxylamine (HA). Electron paramagnetic resonance analysis and the oxidation of a HO· probe, benzoic acid, were used to confirm the production of HO·. The production of HO· increased with increasing concentrations of either HA or H2O2 as well as decreasing pH. The second-order rate constant for the reaction was (2.2 ± 0.2) × 10(-4) M(-1) s(-1). HO· was probably produced in two steps: the activation of H2O2 by protonated HA and then reaction between the H2O2 and the intermediate protonated aminoxyl radical generated in the first step. Such a two-step oxidation can possibly be ascribed to the ionizable hydroxyl moiety in the molecular structure of HA, as is suggested by comparing the reactivity of a series of HA derivatives in HO· production. The results shed light on a previously unknown source of HO· formation, which broadens the understanding of its role in environmental processes.

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Removal of hydroxylamine by processes generating OH radicals in aqueous solution

Cited by 17 publications

References 7 publications

Decolorization and Mineralization of Rhodamine B in Aqueous Solution with a Triple System of Cerium(IV)/H₂O₂/Hydroxylamine

Decolorization and Mineralization of Rhodamine B in Aqueous Solution with a Triple System of Cerium(IV)/H₂O₂/Hydroxylamine

Carbamazepine Degradation by Photolysis and Titanium Dioxide Photocatalysis

Production of Hydroxyl Radical via the Activation of Hydrogen Peroxide by Hydroxylamine

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Removal of hydroxylamine by processes generating OH radicals in aqueous solution

Cited by 17 publications

References 7 publications

Decolorization and Mineralization of Rhodamine B in Aqueous Solution with a Triple System of Cerium(IV)/H2O2/Hydroxylamine

Decolorization and Mineralization of Rhodamine B in Aqueous Solution with a Triple System of Cerium(IV)/H2O2/Hydroxylamine

Carbamazepine Degradation by Photolysis and Titanium Dioxide Photocatalysis

Production of Hydroxyl Radical via the Activation of Hydrogen Peroxide by Hydroxylamine

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Product

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Decolorization and Mineralization of Rhodamine B in Aqueous Solution with a Triple System of Cerium(IV)/H₂O₂/Hydroxylamine

Decolorization and Mineralization of Rhodamine B in Aqueous Solution with a Triple System of Cerium(IV)/H₂O₂/Hydroxylamine