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Reactivity of Zn+aq in high-temperature water radiolysis

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/d2cp02434a· OSTI ID:1978869
For this work, reactivity of transients involving Zn+ in high-temperature water radiolysis has been studied in the temperature range of 25–300 °C. The reduced monovalent zinc species were generated from an electron transfer process between the hydrated electron and Zn2+ ions using pulse radiolysis. The Zn+ species can subsequently be oxidized by the radiolytically-produced oxidizing species: ˙OH, H2O2 and ˙H. We find that the absorption of monovalent zinc is very sensitive to the pH of the medium. An absorption maximum at 306–311 nm is most pronounced at pH 7 and the signal then decreases in acidic media where the reducing electrons are competitively captured by protons. At pH values higher than 7, hydroxo-forms of Zn2+ are created and the maximum of the absorption signal begins to shift to the red spectral region. We find that the optical spectrum of Zn+aq cannot be fully explained in terms of a charge-transfer to solvent (CTTS) process, which was previously proposed. Reaction rates of most of the recombination reactions investigated follow the empirical Arrhenius relationship at temperatures up to 200 °C and have been determined at higher temperatures for the first time. A bimolecular disproportionation reaction of Zn+aq is not observed under the conditions investigated.
Research Organization:
University of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FC02-04ER15533
OSTI ID:
1978869
Alternate ID(s):
OSTI ID: 1881352
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 33 Vol. 24; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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