(48a) Cobalt (II) Activated Sodium Percarbonate for the Degradation of Tetracycline Antibiotics By Using Reactive Oxygen and High Valent-Cobalt Oxo Species.

The present study is one of the alluring advance oxidation processes (AOPs) involving the reaction of sodium percarbonate (SPC) and cobalt (II) generating reactive oxygen species (ROSs) i.e., hydroxyl radicals, superoxide radicals and high-valent cobalt oxo used for the destruction of chlorinated organic solvents (COSs). The contribution and influence of these different ROSs in the process of degrading the pollutants is unclear and unanswered till now. The production and existence of the cobalt oxo was confirmed in acidic media as significant intermediately oxidant. Methyl phenyl sulfoxide was used as probe compound. The scavengers tests were also performed to evaluate the presence of hydroxyl and superoxide radicals whereas, most of the ROSs converted from cobalt oxo to reactive oxygen radicals, thus increased the pH values of the solution and molar ratio of the SPC/Co (II). The degradation of the pollutants was found highly dependent on the substrate reactivity and the availability of the present number of ROSs in the system. Cobalt oxo has a higher rate of reaction affinity with organic substrates having least ionization potentials. On the other hand, contrary to the free radicals’ oxidation, cobalt oxo showed high resistance to humic acid and other ions in the process. This research can open new horizons for the degradation of chlorinated organic pollutants (COSs) using cobalt (II) activated SPC System.