Ozone homolysis

Advanced oxidation processes (AOP) can be classified using their manner of OH radical production. The most known AOP in water treatment is the combination of ozone with H2O2. Other AOP include the UV-induced AOP (UV/H2O2, UV/ozone, UV/Ti02), Fenton and Photo-Fenton processes, sonolytically induced AOP and those AOP which create OH radicals directly from water by homolysis (gamma radiolysis/electron beam injection, VUV-irradiation). In the following chapters, each technology is discussed with respect to MTBE elimination. 

Ozone is formed in the stratosphere by the short-wavelength (< 240-nm) homolysis of molecular oxygen (O2) to two oxygen atoms (O), followed by the subsequent collision of an oxygen atom with an oxygen molecule to produce O3. The absorption spectrum of ozone (X ax = 255 nm) is such that virtually all the potentially damaging ultraviolet wavelengths between 200 and 300 nm are screened out before they reach... 

We have studied the kinetics of this reaction in CFCI3 at -4 C and have obtained the kinetic isotope effect and an approximate activation energy. Using these data, both an electron-transfer reaction and a concerted 1,3-dipolar insertion reaction can be eliminated as mechanistic possibilities for the peroxide-ozone reaction. We conclude the mechanism involves a molecule-assisted homolysis ... 

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