N-Butanol

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The analysis results from Section 3.3 and 3.4 show that PBX decomposed and generated n-butanol after the oxidation, of which n-butanol is an inhibitor of hydroxyl free radicals. As the concentration of n-butanol increased, the indirect ozone oxidation reaction was inhibited, and the direct oxidation was the major pathway. Although the indirect ozone oxidation reaction occurred, it was not significant and therefore the pH did not decrease obviously.
According to the principle of charge balance, there must be equal number of cationic and anionic (H+ and K+) species in the PBX solution. Fig. 5 show that the concentration of IC was maintained at 0 mg/L during the entire oxidation process, indicating that there is no CO32- and HCO3- in this solution. The ion …show more content…

Therefore, PBX was oxidized to generate some SO42- to combine with H+. Fig. 7 shows that with increasing oxidation time, the concentration of SO42- increased, whereas the concentration of PBX decreased. After ozone oxidation of air source, the SO42- concentration increased significantly in 20 min, but 20 min later, the increase in the concentration gradually slowed and finally became constant at 80.1 mg/L at 60 min. The concentration of PBX decreased in 15 min and then became constant at 60 min. However, for the oxygen source ozone oxidation, the concentration of SO42- increased rapidly in 12 min and remained constant at 80.1 mg/L after 12 min. The concentration of PBX dropped in 12 min and then remained unchanged after 12 min. At 0 min ozone oxidation time, the concentration of SO42- was 0 mg/L. The sulfur in PBX is in the form of organic sulfur, indicating that some sulfur of PBX converted into SO42- after oxidation. According to the products analysis results of PBX (section 3.4), because of the strong oxidation ability of ozone, the sulfur of PBX converted into SO42-, in which sulfur is in the highest valence state (S6+), instead of producing reductive organic sulfide (S2-).

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