| 零价铁对重金属和硝酸根的同步去除研究 |
| 摘要点击 3285 全文点击 1799 投稿时间：2008-04-01 修订日期：2008-07-18 |
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| 中文关键词 Cu2+ Ni2+ Cr(Ⅵ) NO-3 Fe０ 同步处理 |
| 英文关键词 Cu2+ Ni2+ Cr(Ⅵ) NO-3 Fe０ simultaneously treatment |
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| 中文摘要 |
| 为考察零价铁粉(FeO)同步快速处理废水中多种污染物的可能性，研究了Fe０同步处理Cu2+、 Ni2+、 Cr(Ⅵ)等重金属离子和硝酸根.实验结果表明，硝酸盐对重金属离子的去除无明显影响，而不同重金属离子则对硝酸盐的去除有不同的影响.Fe０同步去除水中的NO-3和Cu2+时，明显地提高了硝酸盐的去除率和反应速度，反应120 min使NO-3的去除率从38.2%提高到了95.0％，相应反应速率常数kobs也从0.004 3 min-1提高到了0.033 9 min-1，且kobs与Cu2+的初始浓度呈线性关系.Fe０同步去除水中的NO-3 和Cu2+时，由于Cu2+的存在，使得铁还原NO-3的表观活化能由40.8 kJ·mol-1降低到21.1 kJ·mol-1. 从而加快了Fe０还原NO-3的反应速度.Fe０同步去除水中的NO-3 和Ni2+时，它们之间的相互影响较小.Fe０同步去除水中的NO-3和Cr(Ⅵ)时，溶液中的硝酸盐浓度几乎保持不变，Cr(Ⅵ)的存在明显阻碍了铁粉还原脱除硝酸盐反应的发生. |
| 英文摘要 |
| The wastewater which contains bivalent copper and nitrate, bivalent nickel and nitrate, hexavalent chromium and nitrate were simultaneously treated by the zero-valent iron (Fe０) system to investigate the feasibility of using Fe０ for the remediation of contaminated groundwater. The experimental results indicate that nitrate has no obvious effect on the removal of heavy metals, and different heavy metal has different impacts on the removal of nitrate. Bivalent copper accelerates the nitrate removal percentage and the reaction rate. 50 mg·L-1 bivalent copper made the nitrate removal percentage in 120 min increase from 38.2% to 95.0%, meanwhile made kobs of the nitrate reduction increase from 0.004 3 to 0.033 9 min-1. And the more the concentrations of bivalent copper are, the higher the nitrate removal percentage and the reaction rate are. And it is the bivalent copper that makes the apparent activation energy of the nitrate reduction by Fe０ decrease from 40.8 kJ·mol-1 to 21.1 kJ·mol-1, which leads to the increase of the reaction rate. When Fe０ simultaneously treats the wastewater containing bivalent nickel and nitrate, they have no obvious effects on each other. When Fe０ simultaneously treats the wastewater containing hexavalent chromium and nitrate, the results show the nitrate concentration remains unchanged, and prove that hexavalent chromium decreases the nitrate removal speed. |
