|Ozone is a bluish gas with a boiling point at -112oC. At atmospheric pressure, ozone can partially dissolve in water. At standard pressure and temperature, the solubility of ozone is thirteen times that of oxygen. |
The oxidation potential of 2.07 volts proves that ozone is a strong oxidizer. In fact, ozone is one of the strongest oxidants available for water treatment.
Concentrated mixtures of ozone and oxygen containing more than 20% ozone can become explosive in fluids and gases. In commercial ozone generators, these concentrations do not occur because they can not be easily generated.
Ozone is rather unstable in an aqueous solution; its half-life in water is about 20 minutes. In the air, ozone has a half-life of 12 hours, which explains the higher stability of ozone in the air .
The structure of ozone is as follows
Figure 1: Ozone structure
The symbols δ + and δ- are two so-called partial loads because they are fractions (between 0 and 1), positive or negative, of the elementary charge. Ozone is a dipole molecule. This gives the ozone characteristic properties. Ozone reacts very selectively and is electrophilic [6,7].
The properties of ozone are shown in Table 1.