Dechlorination of chloride-sulfate solutions using ozone

The kinetic characteristics of the chlorine release reaction during oxidation of chloride ion in solutions of Na⁺ – H⁺ – HSO₄^– – Cl^–, Mg²⁺ – H⁺ – HSO₄^– – Cl^–, Zn²⁺ – H⁺ – HSO₄^– – Cl^–, Cu²⁺ – H⁺ – HSO₄^– – Cl^–, Fe³⁺ – H⁺ – HSO₄^– – Cl^–, Mg²⁺ – H⁺ – Cl^–, Ca²⁺ – H⁺ – Cl^– are found. Under similar experimental parameters, the reaction rate takes significantly different values depending on the nature of the added salt. This is due to the possibility of catalyzing the reaction of O₃ with Cl^–(aq) cations of some metals and the formation of chloride and sulfate metal complexes, which leads to changes in the actual concentrations of reagents, as well as changes in the ozone solubility. For aqueous solutions of zinc sulfate and magnesium sulfate with concentrations of 0–1 M at temperatures of 20 and 25°C, ozone solubility, values of the Henry constant and Sechenov coefficient are found.