4.7 Article

Iron (III) hydroxocomplex-methyl viologen dication system as a prospective tool for determination of hydroxyl radical reaction rate constants with environmental pollutants

Journal

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 28, Issue 47, Pages 67891-67897

Publisher

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-17166-2

Keywords

AOPs; Hydroxyl radical; Laser flash photolysis; Iron hydroxocomplex; Methyl viologen dication; Reaction rate constants

Funding

  1. Russian Science Foundation [RSF-NSFC, 21-43-00004]
  2. National Natural Science Foundation of China [NSFC-RSF 22061132001]
  3. Russian Science Foundation [21-43-00004] Funding Source: Russian Science Foundation

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This study introduces a new method to determine the reaction rate constants of hydroxyl radicals by utilizing UVA laser flash photolysis technique and a specific probe substance. The approach allows for measurement of compounds that do not generate optically detectable transient species in reactions with hydroxyl radicals.
Reactivity of oxidative species with target pollutants is one of the crucial parameters for application of any system based on advanced oxidation processes (AOPs). This work presents new useful approach how to determine the hydroxyl radical reaction rate constants (k(OH)) using UVA laser flash photolysis technique. Fe (III) hydroxocomplex at pH 3 was applied as a standard source of hydroxyl radicals and methyl viologen dication (MV2+) was used as selective probe for (OH)-O-center dot radical. Application of MV2+ allows to determine k(OH) values even for compounds which do not generate themselves optically detectable transient species in reaction with hydroxyl radicals. Validity of this approach was tested on a wide range of different persistent pesticides and its main advantages and drawbacks in comparison with existing steady-state and time-resolved techniques were discussed.

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