| 牛梦瑶,郭晨楠,郑治,苏涵,王美艳,孙斌斌,王菲.铁基水热炭活化过硫酸盐催化降解三氯生机制[J].农业环境科学学报,2025,44(7):1860-1871. |
| 铁基水热炭活化过硫酸盐催化降解三氯生机制 |
| Mechanism of iron-based hydrochar in activating persulfate for triclosan catalytic degradation |
| 投稿时间：2024-09-11 |
| DOI：10.11654/jaes.2024-0767 |
| 中文关键词: 富铁污泥 铁基水热炭 过硫酸盐氧化 三氯生 降解 |
| 英文关键词: iron-enriched sludge iron-based hydrochar persulfate oxidation triclosan degradation |
| 基金项目:国家自然科学基金青年科学基金项目（42007322）；河北省中央引导地方科技发展资金项目（246Z3604G） |
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| 摘要点击次数: 1888 |
| 全文下载次数: 1829 |
| 中文摘要: |
| 基于生物炭自身催化降解活性有限的特点，本研究将富铁污泥通过一步水热技术制备为铁基水热生物炭，利用其丰富的化学官能团及铁可变的氧化还原特性促进过硫酸盐（PS）活化，探究污泥铁基水热炭活化PS催化降解三氯生（TCS）的性能及机制。结果表明，污泥原料中铁碳质量比为2.34∶1时，水热炭具有最高的比表面积、最丰富的孔隙结构以及最强的Fe O/Si O Fe峰强度。铁基水热炭铁碳质量比为2.34∶1、用量为0.6 g·L-1、过一硫酸盐（PMS）浓度为1.5 mmol·L-1以及pH=3.8时，PMS氧化体系有最佳的TCS处理效果，TCS降解率达到91%，降解速率常数（Kobs）达到（0.022 5±0.001 6）min-1。铁基污泥水热炭在4次重复利用性实验后TCS的Kobs仍能达到（0.017 7±0.001 7）min-1，在实际/模拟水体环境中性能表现良好。研究表明，铁基污泥水热炭的降解机制主要以自由基降解途径为主，表面的铁和碳对TCS降解具有协同作用。 |
| 英文摘要: |
| 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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