Rate Constants and Mechanisms of the Reactions of Cl • and Cl 2 •– with Trace Organic Contaminants

Cl• and Cl2•– radicals contribute to the degradation of trace organic contaminants (TrOCs) such as pharmaceutical and personal care products and endocrine-disrupting chemicals. However, little is known about their reaction rate constants and mechanisms. In this study, the reaction rate constants of Cl• and Cl2•– with 88 target compounds were determined using laser flash photolysis. Decay kinetics, product buildup kinetics, and competition kinetics were applied to track the changes in their transient spectra. Cl• exhibited quite high reactivity toward TrOCs with reaction rate constants ranging from 3.10 × 109 to 4.08 × 1010 M–1 s–1. Cl2•– was less reactive but more selective, with reaction rate constants…

• NN
  National Natural Science Foundation of China

  Awards: 21622706, 41425015, 21577178, 21876210
• MO
  Ministry of Science and Technology of the People's Republic of China

  Award: SQ2017YFGH001858