Figure 3. Hydroxyl radical concentration as a function of pulsed corona discharge time at different applied voltages (DMSO concentration ) 2.82 10-2 M; initial conductivity ) 150 íS cm-1; initial pH ) 5.5). The concentration of hydroxyl radicals was determined by quantifying the concentration of hydroxyl-terephthalate and assuming a 35% yield of the reaction of NaTA with hydroxyl radicals to produce hydroxyl-terephthalate.
Figure 4. Effect of applied voltage on the formation of OH¥ (NaTA concentration ) 5 10-4 M; initial conductivity of solution ) 150 íS cm-1; initial pH ) 5.5; concentration of OH¥ reflects 35% efficiency of the reaction with NaTA). The concentration of hydroxyl radicals was determined by quantifying the concentration of hydroxyl-terephthalate and assuming a 35% yield of the reaction of NaTA with hydroxyl radicals to produce hydroxyl-terephthalate.