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Electrochemically and Bioelectrochemically Induced Ammonium Recovery
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Scavenging the Water Cation in Concentrated Acidic Solutions
Jun Ma1, Jay A LaVerne2, Mehran Mostafavi1
1Laboratoire de Chimie Physique/ELYSE, Univ. Paris-Sud/CNR/Université Paris-Saclay , Orsay 901405, France.
The Journal of Physical Chemistry. A
|October 10, 2015
Summary
This study reveals that direct ionization and scavenging of water radicals (H2O•+) are crucial for fast oxidation reactions in concentrated acidic solutions, not just hydroxyl radicals.
Area of Science:
- Physical Chemistry
- Radiation Chemistry
- Chemical Kinetics
Background:
- Fast oxidation processes in concentrated acidic solutions are complex.
- Understanding early-time reaction mechanisms is vital for radiation chemistry.
Purpose of the Study:
- To investigate the kinetics of radical species formed during fast oxidation.
- To elucidate the mechanisms of solute oxidation on picosecond timescales.
Main Methods:
- Utilized picosecond pulse radiolysis to observe radical species kinetics.
- Employed diffusion-kinetic simulations to model spur reactions.
Main Results:
- Observed yields could not be explained by hydroxyl radical (OH•) kinetics alone.
- Direct ionization and scavenging of water radical cations (H2O•+) contribute significantly to solute oxidation.
- Determined H2O•+ scavenging fractions for phosphate, sulfate, chloride, and bromide ions.
Conclusions:
- Established that direct ionization and H2O•+ scavenging are key mechanisms in fast solute oxidation.
- Provided the first semiquantitative estimates of H2O•+ scavenging fractions for multiple solutes.
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