有机酸强化电动修复去除污染土壤中的重金属。
Removal of heavy metals from contaminated soil by electrodialytic remediation enhanced with organic acids.
机构信息
Centre of Research in Physical and Chemical Analysis (CRAPC), PO BOX 248, Algiers, 16004 Algeria and Laboratory of Hydrometallurgy and Inorganic Molecular Chemistry, Faculty of Chemistry, University of Sciences and Technology Houari Boumediene, USTHB PO BOX 32 El Alia Bab Ezzouar, Algiers, 16111, Algeria.
Department of Chemical Engineering, University of Vigo, Rua Maxwell s/n. Edificio Fundicion, 36310 Vigo, Spain.
出版信息
Environ Sci Process Impacts. 2016 Nov 9;18(11):1440-1448. doi: 10.1039/c6em00380j.
The soil from an industrial area in Algeria was contaminated with Cr (8370 mg kg), Ni (1135 mg kg) and zinc (1200 mg kg). The electrodialytic remediation of this soil was studied using citric acid and EDTA as facilitating agents. 0.1 M citric acid or EDTA was added directly to the soil before it was introduced in an electrodialytic cell in an attempt to enhance the heavy metal solubility in the interstitial fluid. The more acidic pH in the soil when citric acid was used as the facilitating agent was not enough to mobilize and remove the metals from the soil. Only 7.2% of Ni and 6.7% of Zn were removed from the soil in the test with citric acid. The best results were found with EDTA, which was able to solubilize and complex Zn and Ni forming negatively charged complexes that were transported and accumulated in the anolyte. Complete removal was observed for Ni and Zn in the electrodialytic treatment with EDTA. Minor amounts of Cr were removed with both EDTA and citric acid.
来自阿尔及利亚工业区的土壤受到铬（8370 毫克/千克）、镍（1135 毫克/千克）和锌（1200 毫克/千克）的污染。使用柠檬酸和 EDTA 作为促进剂研究了这种土壤的电渗析修复。在将土壤引入电渗析池之前，直接向土壤中添加 0.1 M 的柠檬酸或 EDTA，试图提高间隙流体中重金属的溶解度。当使用柠檬酸作为促进剂时，土壤中的 pH 值更酸性，不足以将金属从土壤中动员和去除。柠檬酸试验中仅从土壤中去除了 7.2%的镍和 6.7%的锌。使用 EDTA 时发现了最佳效果，EDTA 能够溶解和络合 Zn 和 Ni，形成带负电荷的配合物，在阳极电解液中被输送和积累。在 EDTA 的电渗析处理中，镍和锌完全去除。EDTA 和柠檬酸都去除了少量的铬。
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