Conclusion - 應用芬頓法降解四環素及其反應機制之研究

In the tetracycline degradation by Fenton process, the more reagents were added, the higher degradation efficiency occurred. The best reagent concentration ratio to operate Fenton process was [Fe²⁺]/[H2O2] = 100 M /100 M, causing 79.6% degradation of tetracycline in acidic condition. The concentration of hydrogen peroxide and ferrous ions affected the hydroxyl radical production.

Comparing to the degradation experiments of persulfate degradation, hydrogen peroxide showed the best removal efficiency, and peroxymonosulfate showed a stronger oxidizing ability than peroxydisulfate. Sulfate radicals may not only interact with target compound but also with ferrous ion. The degradation pattern of peroxydisulfate was different from that in Fenton process, in which fast stage and slow stage occurred in sequence.

In the neutral environment, the degradation efficiency by Fenton process decreased.

The maximum removal was 46.7% when [Fe²⁺]/[H2O2] = 100 M /100 M. In the presence of coexisting organic macromolecules, citrate showed a lower removal efficiency than that without citrate; humic acid interacted with tetracycline in the beginning, leading to a decrease in tetracycline concentration; -cyclodextrin showed a better removal efficiency in [Fe²⁺]/[H2O2] = 50 M /50 M in acidic condition. In neutral condition, macromolecules might chelate with tetracycline and the degradation efficiency increased slightly because the tetracycline molecules combined with coexisting organic molecules might be released back during the degradation process.

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APPENDIX A. Data analysis of the degradation of

Tetracycline concentration (ppm)

APPENDIX B. Data analysis of the degradation of tetracycline by Fe

²⁺

activated persulfates

Tetracycline concentration (ppm)

APPENDIX C. Data analysis of the degradation of tetracycline by Fenton process in neutral environment

Tetracycline concentration (ppm)