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| Mechanism of iron-based hydrochar in activating persulfate for triclosan catalytic degradation |
| Received:September 11, 2024 |
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| KeyWord:iron-enriched sludge;iron-based hydrochar;persulfate oxidation;triclosan;degradation |
| Author Name | Affiliation | E-mail | | NIU Mengyao | School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China | | | GUO Chennan | China Nuclear Power Engineering Co., Ltd., Hebei Branch, Shijiazhuang 050000, China | | | ZHENG Zhi | School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China | | | SU Han | School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China | | | WANG Meiyan | School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China | | | SUN Binbin | School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China | | | WANG Fei | School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China | wangfei18@hebut.edu.cn |
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| Abstract: |
| Given the limited catalytic degradation activity of biochar, iron-enriched sludge was transformed into iron-based hydrochar using a one-step hydrothermal method. This process leveraged the abundant chemical functional groups and variable redox properties of iron to enhance the activating ability of hydrochar for persulfate（PS）. This study examined the performance and mechanisms by which iron-based hydrochar activates PS for the catalytic degradation of triclosan（TCS）. The findings indicated that when the iron-to-carbon mass ratio in the sludge feedstock was 2.34∶1, the hydrochar exhibited the advantages of the highest specific surface area, richest pore structure, and strongest Fe O/Si O Fe peak intensity. The optimal conditions for the permonosulfate（PMS）oxidation system were found to be iron-to-carbon mass ratio of iron-based hydrochar of 2.34∶1, iron-based hydrochar dosage of 0.6 g·L-1, PMS concentration of 1.5 mmol·L-1, and pH of 3.8. Under these conditions, the TCS degradation rate reached 91%, with a degradation rate constant（Kobs）of （0.022 5 ± 0.001 6）min-1. After four reusability experiments, the Kobs remained at（0.017 7 ± 0.001 7）min-1, demonstrating effective performance in real and simulated water environments. The degradation of TCS by the iron-based sludge hydrochar system was primarily mediated by a radical mechanism, with a synergistic effect between surface iron and carbon. |
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