https://scholars.lib.ntu.edu.tw/handle/123456789/548272
標題: | Mechanistic exploration of the catalytic modification by co-dissolved organic molecules for micropollutant degradation during fenton process | 作者: | Lee, Y.-Y. CHIHHAO FAN |
關鍵字: | Citrate; Cyclodextrin; Fenton process; Humic acid; Tetracycline | 公開日期: | 2020 | 卷: | 258 | 來源出版物: | Chemosphere | 摘要: | This study aimed to explore the catalytic effect of co-dissolved organic compounds on the tetracycline degradation by Fenton process both in the acidic and neutral environment. The experiments were carried out at [Fe2+]/[H2O2] of 50 μM/50 μM and 50 μM/100 μM. The humic acid, citrate and α-cyclodextrin were selected as the co-dissolved organic compounds. The best removal efficiency of 71% was observed at [Fe2+]/[H2O2] of 50 μM/100 μM without the presence of co-dissolved organic compounds. In the presence of co-dissolved organic compounds, the competition effect occurred and tetracycline removal efficiency was reduced to different extents depending on the H2O2 concentrations and chemical properties of the co-dissolved organic substances. The mechanistic exploration confirmed that the complex-forming interactions among Fe2+, tetracycline and organic co-dissolved molecules kept the catalytic ferrous/ferric redox cycle operating to generate hydroxyl radicals for tetracycline degradation at neutral condition, and this phenomenon was more obvious when the H2O2 concentration was higher. Complex formation also contributed to the overall tetracycline removal in addition to oxidation reactions. By comparing to the mass spectra of citrate, the α-cyclodextrin having a larger molecular structure might react with hydroxyl radicals at a higher probability, resulting in an apparent difference in degradation efficiency despite of the equality of their existing amount in the beginning of the experiment. © 2020 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.url?eid=2-s2.0-85086754664&partnerID=40&md5=07e6b30f5eeb6a31bc956671ff78c21c https://scholars.lib.ntu.edu.tw/handle/123456789/548272 |
DOI: | 10.1016/j.chemosphere.2020.127338 | SDG/關鍵字: | Cyclodextrins; Degradation; Efficiency; Mass spectrometry; Molecules; Organic compounds; Photodegradation; Redox reactions; Catalytic modifications; Competition effects; Degradation efficiency; Dissolved organic compounds; Dissolved organic substances; Neutral environment; Oxidation reactions; Removal efficiencies; Dissolution; alpha cyclodextrin; citric acid; dissolved organic matter; humic acid; hydroxyl radical; tetracycline; hydrogen peroxide; iron; organic compound; catalysis; catalyst; chemical pollutant; chemical reaction; concentration (composition); degradation; dissolved organic carbon; drug; experimental study; exploration; hydrogen peroxide; hydroxyl radical; organic compound; oxidation; pollutant removal; solvent; Article; catalyst; chemical structure; complex formation; controlled study; Fenton reaction; heavy metal removal; high performance liquid chromatography; industrial production; ionization; mass spectrometry; oxidation reduction reaction; stoichiometry; waste water treatment plant; catalysis; chemistry; ecosystem restoration; humic substance; procedures; water pollutant; Catalysis; Environmental Restoration and Remediation; Humic Substances; Hydrogen Peroxide; Iron; Organic Chemicals; Oxidation-Reduction; Tetracycline; Water Pollutants, Chemical |
顯示於: | 生物環境系統工程學系 |
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