Nitrogen compounds' formation in aqueous solutions under high ionizing radiation: An overview

Dey, G.R.

doi:10.1016/j.radphyschem.2010.10.010

Cited by 16 publications

(7 citation statements)

References 32 publications

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“…In any case, the ultimate products of nitrite and nitrate ( Figure 6 c) suggested that our experiments followed similar mechanisms to those observed in previous reports on the conversion of ammonia to nitrite and nitrate through UV irradiation, in the presence of H 2 O 2 [ 4 , 5 , 69 ]. It is difficult to interpret experimental observations related to the formation and decay mechanisms of peroxynitrite; thus findings are controversial [ 4 , 5 , 52 , 53 , 60 , 64 , 65 , 70 ]. A full discussion of the step-by-step mechanisms under various irradiation conditions is beyond the scope of this article and may be found elsewhere [ 5 , 52 , 60 , 70 ].…”

Section: Discussionmentioning

confidence: 99%

“…It is difficult to interpret experimental observations related to the formation and decay mechanisms of peroxynitrite; thus findings are controversial [ 4 , 5 , 52 , 53 , 60 , 64 , 65 , 70 ]. A full discussion of the step-by-step mechanisms under various irradiation conditions is beyond the scope of this article and may be found elsewhere [ 5 , 52 , 60 , 70 ]. Our results demonstrate a new way to form this species and open avenues to its further investigation on ultrafast timescales.…”

Section: Discussionmentioning

confidence: 99%

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Radical Chemistry in a Femtosecond Laser Plasma: Photochemical Reduction of Ag+ in Liquid Ammonia Solution

et al. 2018

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Plasmas with dense concentrations of reactive species such as hydrated electrons and hydroxyl radicals are generated from focusing intense femtosecond laser pulses into aqueous media. These radical species can reduce metal ions such as Au3+ to form metal nanoparticles (NPs). However, the formation of H2O2 by the recombination of hydroxyl radicals inhibits the reduction of Ag+ through back-oxidation. This work has explored the control of hydroxyl radical chemistry in a femtosecond laser-generated plasma through the addition of liquid ammonia. The irradiation of liquid ammonia solutions resulted in a reaction between NH3 and OH·, forming peroxynitrite and ONOO−, and significantly reducing the amount of H2O2 generated. Varying the liquid ammonia concentration controlled the Ag+ reduction rate, forming 12.7 ± 4.9 nm silver nanoparticles at the optimal ammonia concentration. The photochemical mechanisms underlying peroxynitrite formation and Ag+ reduction are discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Radical Chemistry in a Femtosecond Laser Plasma: Photochemical Reduction of Ag+ in Liquid Ammonia Solution

et al. 2018

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“…The principal reactions of NO 3 − ions during the irradiation are listed in Equations (30)–(38) [ 13 , 28 , 29 , 30 , 31 , 32 , 33 ]. The reactions can be classified by direct and indirect decomposition reactions.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…As shown in Equation (30), the NO 3 − ion is directly changed into NO 3 ● and electron due to the γ-ray irradiation [ 13 , 28 ]. The NO 3 − ion is also changed into NO 3 2− ion or NO 2 ● through the reactions with e aq − or H ● , as can be seen in Equations (31) and (32) [ 29 , 30 ]. The NO 3 2−● reduces into NO 2 ● in the water, as represented in Equation (33) [ 29 , 31 ].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Hydrazine Radiolysis by Gamma-Ray in the N2H4–Cu+–HNO3 System

Chang

Won

Park

et al. 2021

IJMS

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Radiolysis of chemical agents occurs during the decontamination of nuclear power plants. The γ-ray irradiation tests of the N2H4–Cu+–HNO3 solution, a decontamination agent, were performed to investigate the effect of Cu+ ion and HNO3 on N2H4 decomposition using a Co-60 high-dose irradiator. After the irradiation, the residues of N2H4 decomposition were analyzed by Ultraviolet-visible (UV) spectroscopy. NH4+ ions generated from N2H4 radiolysis were analyzed by ion chromatography. Based on the results, the decomposition mechanism of N2H4 in the N2H4–Cu+–HNO3 solution under γ-ray irradiation condition was derived. Cu+ ions form Cu+N2H4 complexes with N2H4, and then N2H4 is decomposed into intermediates. H+ ions and H● radicals generated from the reaction between H+ ion and eaq− increased the N2H4 decomposition reaction. NO3− ions promoted the N2H4 decomposition by providing additional reaction paths: (1) the reaction between NO3− ions and N2H4●+, and (2) the reaction between NO● radical, which is the radiolysis product of NO3− ion, and N2H5+. Finally, the radiolytic decomposition mechanism of N2H4 obtained in the N2H4–Cu+–HNO3 was schematically suggested.

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