| 纳米FeO作用下4-氯酚的脱氯特性及机理 |
| 摘要点击 1420 全文点击 1053 投稿时间：2006-03-17 修订日期：2006-08-08 |
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| 中文关键词 纳米铁 4-氯酚 苯酚 脱氯 地下水污染 |
| 英文关键词 nanoscale iron 4-chlorophenol (4-CP) phenol dechlorination groundwater pollution |
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| 中文摘要 |
| 采用化学还原法制备了纳米FeO, ESEM测定结果表明其颗粒在1～100 nm内. 实验表明这些纳米FeO能在20 h内将初始浓度为20 mg/L的4-氯酚完全降解, FeO对4-CP的还原脱氯是主要去除途径. 苯酚是脱氯反应的主要产物. 当4-CP的初始浓度由20 mg/L增大到50, 100, 150 mg/L时, 其相对去除率明显降低, 但绝对降解量有较大提高. 温度不仅影响脱氯速率, 而且影响4-CP去除的途径. 30℃时, 脱氯反应为主要反应; １０℃时, 较易产生氧化产物. Fe原子的迁移过程在4-CP的降解中也是一个重要的限速步骤. 此外, 纳米FeO具有很好的稳定性, 在受试的379 h内, 纳米FeO能够应对不同浓度冲击及反复投加的4-氯酚冲击的能力. |
| 英文摘要 |
| Nanoscale FeO was synthesized through a reductive method and the size of the particles is in the range of 1～100 nm, observed by ESEM image. The experimental results demonstrated that these metal particles can reduce 4-chlorophenol (4-CP) completely in 20 hours, when the initial concentration was 20 mg/L. Dechlorination by FeO is the main reaction pathway, and phenol is the main product. As the concentration of 4-CP increased from 20 mg/L to 50, 100, 150 mg/L, the relative dechlorination ratio decreased obviously. But the reduced amounts of 4-CP increased. Temperature can influence dechlorination rate and change the reductive pathway. Dechlorination is the main reaction at 30℃ while some oxidized compounds may be produced at 10℃. The transfer of iron atom may be an important factor, limiting the dechlorination rate. Moreover, the stability and durability of nanoscale FeO was assessed through batch studies over extended periods of time. The results indicated that nanoscale FeO can resist the shock of 4-CP concentration during 379 hours. |
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