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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Electromigration of Mn, Fe, Cu and Zn with citric acid in contaminated clay
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Electromigration of Mn, Fe, Cu and Zn with citric acid in contaminated clay

机译：柠檬酸中锰，铁，铜和锌在污染黏土中的电迁移

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摘要

Metal reactivity, speciation and solubility have an important influence in its transportation through a porous matrix by electrokinetics and, therefore, they dramatically affect the removal efficiency. This work deals with the effect of solubility and transport competition among several metals (Mn, Fe, Cu and Zn) during their transport through polluted clay. The unenhancement electrokinetic treatment results in a limited removal of the tested metals because they were retained into the kaolinite sample by the penetration of the alkaline front. Metals showed a removal degree in accordance with the solubility of the corresponding hydroxide and its formation pH. In 7 days of treatment, the removal results were: 75.6% of Mn; 68.5% of Zn, 40.6% of Cu and 14.8% of Fe. In order to avoid the negative effects of the basic front generated at the cathode, two different techniques were proposed and tested: the addition of citric acid as complexing agent to the polluted kaolinite sample and the use of citric acid to control de pH on the cathode chamber. Both techniques are based on the capability of citric acid to act as a complexing and neutralizing agent. Almost complete removal of Mn, Cu and Zn was achieved when citric acid was used (as neutralizing or complexing agent). But Fe only reached 33% of removal because it formed a negatively charged complex with citrate that retarded its transportation to the cathode.
机译：金属的反应性，形态和溶解度对电动势通过多孔基质的传输有重要影响，因此，它们会显着影响去除效率。这项工作处理了几种金属（锰，铁，铜和锌）在通过污染粘土的运输过程中的溶解度和运输竞争的影响。不增强的电动处理导致测试金属的去除受限，因为它们通过碱性前沿的渗透而保留在高岭土样品中。根据相应的氢氧化物的溶解度及其形成的pH，金属显示出去除程度。在7天的处理中，去除结果为：75.6％的Mn；锌为68.5％，铜为40.6％，铁为14.8％。为了避免在阴极产生碱性前沿的负面影响，提出并测试了两种不同的技术：向污染的高岭石样品中添加柠檬酸作为络合剂，以及使用柠檬酸控制阴极上的de pH室。两种技术均基于柠檬酸作为络合和中和剂的能力。当使用柠檬酸（作为中和剂或络合剂）时，几乎可以完全去除Mn，Cu和Zn。但是，铁仅达到去除率的33％，因为它与柠檬酸盐形成带负电荷的络合物，从而阻碍了其向阴极的传输。

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