Generation of Hydroxyl Radicals during Laser Breakdown of Aqueous Solutions in the Presence of Fe and Cu Nanoparticles of Different Sizes

2020 ◽  
Vol 28 (2) ◽  
pp. 107-110 ◽  
Author(s):  
I. V. Baimler ◽  
A. V. Simakin ◽  
O. V. Uvarov ◽  
M. Yu. Volkov ◽  
S. V. Gudkov
Keyword(s):  
Aqueous Solutions ◽  
Hydroxyl Radicals ◽  
Cu Nanoparticles ◽  
Laser Breakdown

At the crossroad of photochemistry and radiation chemistry: formation of hydroxyl radicals in diluted aqueous solutions exposed to ultraviolet radiation

2017 ◽  
Vol 19 (43) ◽  
pp. 29402-29408 ◽  
Author(s):  
Kateřina Tomanová ◽  
Martin Precek ◽  
Viliam Múčka ◽  
Luděk Vyšín ◽  
Libor Juha ◽  
...  
Keyword(s):  
Ultraviolet Radiation ◽  
Aqueous Solutions ◽  
Hydroxyl Radicals ◽  
Radiation Chemistry ◽  
Quantum Yields ◽  
Oh Radicals

We provide evidence on the formation of ˙OH radicals via 253.7 nm photolysis of aqueous solutions, determine their quantum yields, and apply the knowledge to photo-induced formation of phospholipid hydroperoxides.

scholarly journals Reaction of Br3·2- with 2-Deoxy-D-ribose. A Preferred Attack at C-1

1978 ◽  
Vol 33 (6) ◽  
pp. 666-668 ◽  
Author(s):  
Barry J. Parsons ◽  
Dietrich Schulte-Frohlinde ◽  
Clemens von Sonntag
Keyword(s):  
Aqueous Solutions ◽  
Hydroxyl Radicals ◽  
Pulse Radiolysis ◽  
Hydrogen Abstraction ◽  
Major Product ◽  
Alternative Route ◽  
Sugar Moiety ◽  
Bromide Ions

Abstract In the photolysis of 5-bromouracil containing DNA Br atoms are expected inter mediates. In order to evaluate the possible site of attack of the Br atom at the sugar moiety of DNA the reaction of 2-deoxy-D-ribose with the Br atom (complexed with two bromide ions) was investigated. Hydroxyl radicals generated by the radiolysis of N2O saturated aqueous solutions were converted into Br3·2- radicals by 1 M bromide ions. Br3·2- reacts with 2-deoxy-D-ribose (k = 3.7 · 104M-1s-1, pulse radiolysis). The major product is 2-deoxy-D-erythro-pentonic acid (G = 2.4, γ-radiolysis). It is formed by hydrogen abstraction from C-l and oxidation of this radical by other radicals. An alternative route via the radical at C-2 is neglible. It follows that Br3·2- reacts preferentially at C-1 of 2-deoxy-D-ribose

Electron spin resonance study of spin-trapped azide radicals in aqueous solutions

1980 ◽  
Vol 58 (15) ◽  
pp. 1592-1595 ◽  
Author(s):  
Walter Kremers ◽  
Ajit Singh
Keyword(s):  
Electron Spin Resonance ◽  
Aqueous Solutions ◽  
Hydroxyl Radicals ◽  
Electron Spin ◽  
Sodium Azide ◽  
Electron Spin Resonance Study ◽  
Spin Traps ◽  
Spin Resonance ◽  
Hyperfine Splittings ◽  
Spin Resonance Study

Organic spin traps have been used to study the formation of azide radicals during the reaction of azide anions with hydroxyl radicals. The azide radicals have been successfully trapped with three spin traps: 5,5-dimethylpyrroline-1-oxide (DMPO), phenyl-N-tert-bulyl nitrone (PBN), and 4-pyridyl-N-tert-butyl nitrone (PyBN). The azide radicals produced from 15N sodium azide have also been trapped. The hyperfine splittings of the resulting radicals have been determined.

Biogenic nanosilver-assisted degradation of tetracycline in aqueous solutions via sulfate and hydroxyl radicals

2020 ◽  
Vol 208 ◽  
pp. 345-354
Author(s):  
Mohammad Malakootian ◽  
Seyedeh Nastaran Asadzadeh ◽  
Mehrdad Khatami
Keyword(s):  
Aqueous Solutions ◽  
Hydroxyl Radicals

Kinetics of ozone reactions with 1-naphthalene, 1,5-naphthalene and 3-nitrobenzene sulphonic acids in aqueous solutions

2001 ◽  
Vol 44 (5) ◽  
pp. 7-13 ◽  
Author(s):  
V. Calderara ◽  
M. Jekel ◽  
C. Zaror
Keyword(s):  
Aqueous Solutions ◽  
Hydroxyl Radicals ◽  
Oxidation Kinetics ◽  
Order Kinetic ◽  
Rate Of Reaction ◽  
Direct Reactions ◽  
Kinetics Of ◽  
By Products ◽  
Ozone Reactions ◽  
Primary Oxidation

This paper describes the ozone oxidation kinetics of 1-naphthalene (1NS), 1,5-naphthalene (1,5NDS), and 3-nitrobenzene (3NBS) sulphonic acid. The presence of hydroxyl radicals and their effect on the overall rate of reaction was studied. Second order kinetic constants of direct reactions were estimated at around 252 M-1s-1, 41 M-1s-1 and 22 M-1s-1, for 1NS, 1,5NDS, and 3NBS sulphonic acids, respectively. At pH 3, the indirect reaction accounted for 2%, 15% and 4% of total primary oxidation of 1NS, 1,5NBS, and 3NBS sulphonic acids, respectively. At pH 9, indirect reaction contribution increased to 73%, 84% and 48%, respectively. C4 compounds (maleic and fumaric acids), C2 (oxalic), C1 (formic) and sulphate were identified as oxidation by-products in all cases. TOC slowly decreased throughout ozonation, reaching around 40-60% and 60-70% reduction over 90 minutes at pH 7 and 3, respectively.

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