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| Optimization of Fenton oxidation technology for enhancing polycyclic aromatic hydrocarbons degradation in water |
| Received:December 26, 2024 |
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| KeyWord:polycyclic aromatic hydrocarbons(PAHs);Fenton oxidation technology;citric acid;reaction time;degradation |
| Author Name | Affiliation | E-mail | | ZHOU Luan | Institute of Organic Contaminant Control and Soil Remediation, Nanjing Agricultural University, Nanjing 210095, China | | | WANG Tongxin | Institute of Organic Contaminant Control and Soil Remediation, Nanjing Agricultural University, Nanjing 210095, China | | | CHEN Xuwen | Institute of Organic Contaminant Control and Soil Remediation, Nanjing Agricultural University, Nanjing 210095, China | chenxuwen@njau.edu.cn | | LING Wanting | Institute of Organic Contaminant Control and Soil Remediation, Nanjing Agricultural University, Nanjing 210095, China | |
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| Abstract: |
| In order to solve the problems of incomplete removal, low oxidant utilization rate and serious water matrix damage in the actual removal of polycyclic aromatic hydrocarbons（PAHs）in water by Fenton oxidation technology, various reaction conditions of Fenton technology were optimized. This study mainly explored the influence of key factors such as Fe2+/H2O2 ratio, citric acid concentration of chelating agent, reaction time, H2O2 concentration and pollutant concentration on Fenton oxidation technology. It was found that the degradation percentage of PAHs gradually increased with the extension of reaction time, but tended to be stable after 48 h. H2O2 and Fe2+ were the core components of Fenton reagent, and the ·OH was produced when the O-O bond in H2O2 was broken by Fe2+. The optimal H2O2 concentration for PAHs degradation was 1% and the addition ratio of Fe2+/H2O2 was 1/18. Under these conditions, the degradation percentages of fluorene（FLU）, phenanthrene（PHE）, fluoranthrene（FLA） and PYR were as high as 86%, 99%, 98%, and 100%, respectively. However, when the concentration of H2O2 and/or the addition ratio of Fe2+/H2O2 were too high, a large amount of ·OH produced in a short time would quench each other, and excessive Fe2+ would also consume · OH in competition with PAHs, resulting in lower degradation efficiency of PAHs. Citric acid improved the degradation of PAHs by regulating solution pH and chelating with Fe 2+. In this study, the optimal concentration of citric acid was 20 mol·L-1, under which the degradation percentages of FLU, PHE, FLA and PYR were 81%, 78%, 60%, and 100%, respectively. And PAHs can be completely degraded after further extension of time. In addition, the Fenton oxidation technology had the best degradation effect on PAHs below 0.1 mg·L-1 in water, and the degradation percentage of four PAHs exceeded 94%. This study had shown that the optimal parameters of Fe2+/H2O2 addition ratio, citric acid concentration, reaction time, H2O2 concentration and pollutant concentration have been determined through systematic exploration of key factors, and Fenton oxidation technology has the best degradation effect on PAHs in water. |
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