| The physical chemistry properties of ozone, its actual practical application and research progress are reviewed in this article. The emphasis of discussion focuses on the current research and application of advanced oxidation process based on ozone. At the fundamental demand in water treatment and ozone research in its field, this paper presents research purposes and main tasks. The content of dissertation mainly includes three parts:（1） degradation of acetophenone by Ti-MCM-41/O3 process;（2） degradation of acetic acid by Ti-MCM-41/H2O2/O3 process under acidic circumstance;（3） determination of generating ·OH by Ti-MCM-41/H2O2/O3 process under acidic circumstance.In chapter III, acetophenone was selected as the target compound since it could generates H2O2 during its ozonation. After ozonation for 60 min, the removal rates of acetophenone were 50.74% and 80.71% by O3 and Ti-MCM-41/O3, respectively, indicating Ti-MCM-41 could promote the degradation of acetophenone efficiency. The effect of pH values showed that increase of pH resulted in high efficiency of ozonation, for example, the removal rates of acetophenone at the pH values of 2, 3, 4.83 and 8.6 were 36.42%,49.52%,94.97% and 93.21% respectively after 30 min. This result can be explained that OH- may play a critical role in this process. Under the same conditions, the COD removal rates of acetophenone were 39.06% and 45.56% by O3 and Ti-MCM-41/O3, respectively. The decomposition rate of dissolved ozone also ageed with the result of degradation rate of acetophenone. The above results all support the fact that Ti-MCM-41 could effectively active ozone to improve the efficiency of ozonation.In chapter IV, acetic acid was chosen to be the target compound because of its inert to ozone. Degradation of acetic acid by different processes（Ti-MCM-41/H2O2/O3,Ti-MCM-41/O3, MCM-41/H2O2/O3 and H2O2/O3） was conducted. It was found that the corresponding degradation rates of acetic acid were 45.59%, 15.86%, 15.88% and 6.51%, respectively. Showing that Ti-MCM-41/H2O2/O3 had the highest oxidative efficiency When the concentration of H2O2 was 50mg·L-1, 100mg·L-1, 200mg·L-1 and 300mg·L-1, degradation rate of acetic acid was 40.02%, 49.83%, 55.82% and 62.08% respectively. It reveals the amount of acetic acid removal can be controlled by adjusting the amount of H2O2 addition. The amount of Ti-MCM-41 was also investigated, the results revealed that the degradation rate of acetic acid was 23.88%,32.33%,43.38% and 50.22%, respectively, when the amount of Ti-MCM-41 was 0.1g,0.2g,0.35 g and 0.5g, indicating that the rate of generation of hydroxyl radicals can be regulated by the amount of Ti-MCM-41. On the basis of the results above, we can infer the the following conclustion: consuming H2O2 slowly can produce more ·OH in Ti-MCM-41/H2O2/O3, however, producing ·OH in a high rate should consume more H2O2.In chapter V, The amount of ·OH generated in Ti-MCM-41/H2O2/O3 process was measured. The results agreed well with the results of degradation of acetic acid. The generated amount of ·OH was 4.08mg·L-1,6.48 mg·L-1,8.07mg·L-1 and 9.33mg·L-1, respectively, when the amount of Ti-MCM-41 was 0.1g,0.2g,0.35 g and 0.5g. |
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