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Abstract：
Lead-contaminated soil was cleaned through ethylene-diamine-teraacetic acid disodium salt (EDTA-2Na) combined with diluted deep eutectic solvent (DES) which was prepared by mixing choline chloride with ethylene glycol. The influences of leaching temperature, leaching time, liquid-solid (L/S) ratio, concentration of EDTA-2Na, water-DES ratio, and the molar ratio of choline chloride-ethylene glycol (Ch-E) on the leaching rate of lead were investigated. The mineral phases of the soil and DES before and after washing were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). The changes to the DESs before and after dissolving lead nitrate (Pb(NO3)2) were analyzed by high resolution mass spectrometry (HRMS) and nuclear magnetic resonance (NMR). Hydrogen bonds and EDTA-2Na in the Ch-M system resulted in the conversion of Pb(NO3)2 to other complex ions such as [Pb·Ch-E]- and [Pb·EDTA-2Na]- and other complex ions due to the dissolution of the washing agent. The results showed that the soil mineral phase did not change significantly and up to 95.79% of Pb could be washed under temperature, time, L/S ratio, EDTA-2Na concentration, DES/water ratio, Ch-E molar ratio, and stirring speed conditions of 40 °C, 2 h, 6, 0.02 M, 2, 0.75 and 300 rpm, respectively. The hydrogen bonds and EDTA-2Na may play a key role in the remediation of lead-contaminated soil by a washing agent. This research describes a rapid, efficient, and environmentally friendly method for remediation of lead-contaminated soil.
摘要：
铅污染的土壤通过乙二胺-四乙酸二钠盐（EDTA-2Na）与稀释的低共熔溶剂（DES）一起清洁，该溶剂是通过将氯化胆碱与乙二醇混合制备的。浸出温度的影响，浸出时间，液固比（L/S），EDTA-2Na的浓度，水-DES比，考察了氯化胆碱-乙二醇(Ch-E)的摩尔比对铅浸出率的影响。使用扫描电子显微镜（SEM）分析了洗涤前后土壤和DES的矿物相，X射线衍射(XRD)傅里叶变换红外光谱(FT-IR)。通过高分辨率质谱（HRMS）和核磁共振（NMR）分析了溶解硝酸铅（Pb（NO3）2）前后DES的变化。Ch-M系统中的氢键和EDTA-2Na导致Pb（NO3）2转化为其他络合离子，例如[Pb·Ch-E]-和[Pb·EDTA-2Na]-和其他络合离子由于洗涤剂的溶解。结果表明，土壤矿物相没有明显变化，在温度下可以洗涤高达95.79％的Pb，时间,L/S比,EDTA-2Na浓度，DES/水比率,Ch-E摩尔比,和40°C的搅拌速度条件，2h,6,0.02M,2、0.75和300rpm，分别。氢键和EDTA-2Na可能在洗涤剂修复铅污染土壤中起关键作用。这项研究描述了一种快速的，高效,和环保的铅污染土壤修复方法。
