| 纳米铁对水中Cr(Ⅵ)和p-NCB的同步修复机制 |
| 摘要点击 1915 全文点击 1129 投稿时间：2008-01-14 修订日期：2008-03-27 |
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| 中文关键词 纳米铁 Cr(Ⅵ) p-NCB 同步修复 |
| 英文关键词 nanoscale iron Cr(Ⅵ) p-NCB simultaneous remediation |
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| 中文摘要 |
| 采用化学沉淀法制备纳米级Fe和纳米级Ni/Fe,利用制备的纳米催化剂对六价铬［Cr(Ⅵ)］与对硝基氯苯（p-NCB）进行同步修复研究.主要探讨纳米级Fe及纳米级Ni/Fe对Cr(Ⅵ)和p-NCB同步修复过程中,受污染水体中Cr(Ⅵ)和对硝基氯苯(p-NCB)的相互影响.实验表明,纳米级Fe可将p-NCB降解为对氯苯胺(p-CAN),并不能进一步脱氯,Cr(Ⅵ)与p-NCB的降解存在着竞争关系.纳米级Ni/Fe双金属应用于p-NCB和Cr(Ⅵ)同步修复,可以取得良好的修复效率,反应产物为Cr(Ⅲ)和苯胺,并不产生中间产物.Ni(Ⅱ)浓度的增加,可以促进脱氯反应的进行,最佳Ni/Fe质量比为1∶50.而Cr(Ⅵ)、p-NCB初始浓度增加会导致脱氯率的下降.Cr(Ⅵ)浓度为20 mg/Ｌ时,对应的最大脱氯效率为43.0%,而p-NCB的浓度为40 mg/Ｌ时,对应的六价铬还原效率为71.4%. |
| 英文摘要 |
| Nanoscale Fe and Ni/Fe, which were prepared by chemical deposition, were utilized as catalyst for remediation of Cr(Ⅵ) and p-NCB in contaminated water. The interactions between Cr(Ⅵ) and p-NCB in contaminated water during the simultaneous remediation process were analyzed. It is demonstrated from the experiment that p-NCB can be degradated into p-CAN by nanoscale iron, but cannot exhibit the effect of dechlorination, and that there is a competitive relationship between Cr(Ⅵ) and p-NCB in the remediation process. The nanoscale Ni/Fe bimetals could be applied in simultaneous remediation of p-NCB with Cr(Ⅵ) and give rise to a good remediation efficiency, where the products are only Cr(Ⅲ) and p-CAN without any intermediate products. It was found that the conditions of higher Ni(Ⅱ) concentration can promote the degradation rate of p-NCB. The optimum Ni/Fe ratio is 1∶50. Whereas, the higher concentrations of Cr(Ⅵ) and p-NCB will lead to the lower degradation rate. Under the condition that concentration of Cr (Ⅵ) was 20 mg/Ｌ,the corresponding maximum dechlorination of p-NCB was 43.0%; under the condition that concentration of p-NCB was 40 mg/Ｌ,the corresponding maximum removal efficiency of Cr(Ⅵ) was 71.4%. |
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