淡水和咸水条件下沿海含水层材料中稀土元素的流动性

IF 6.7 Q1 ENGINEERING, ENVIRONMENTAL
Nitai Amiel, Ishai Dror* and Brian Berkowitz, 
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引用次数: 0

摘要

稀土元素(REE)在制造高科技产品和开发各种技术方面发挥着不可或缺的作用,这导致稀土元素的提取和加工急剧增加。后者反过来又加剧了人为的稀土元素向环境的释放,特别是在地下水系统中。沿海含水层系统是大量人口的饮用水和生活用水来源,因此需要彻底了解 REE 在这些环境中的迁移和滞留机制。在这项研究中,我们使用五种具有代表性的沿海含水层材料和一种酸洗砂样本作为基准,进行了批量和柱状实验。这些实验是在淡水和咸水条件下用氯化钠向 REE 溶液中添加腐植酸(HA)进行的,代表了沿海含水层中不同的地下水成分。结果表明,酸洗砂和天然砂样品中的 REEs 移动性最强,其次是两种低碳酸盐钙质砂岩和一种高钙质砂岩,而红壤砂中的 REEs 移动性最小。溶液中的 REEs 主要以 REE-HA 复合物的形式存在,其流动性主要受 HA 的滞留性控制,而 HA 的滞留性随着含水层材料离子强度和表面积的增加而增加。此外,研究还发现,碳酸盐和粘土矿物的存在会增强表面相互作用,从而降低 REE 的流动性。在酸洗砂和天然砂样品中观察到,柱实验流出物中的中-REE(MREE)回收率较高,这是因为与轻-REE(LREE)和重-REE(HREE)HA 复合物相比,MREE-HA 复合物的稳定性更高。钙质砂岩的 HREE 回收率较高,这是因为 HREE 优先与碳酸根离子络合,而红壤砂的 HREE 回收率较高,这是因为粘土、铁和锰矿物优先保留 LREE 和 MREE。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Mobility of Rare Earth Elements in Coastal Aquifer Materials under Fresh and Brackish Water Conditions

Mobility of Rare Earth Elements in Coastal Aquifer Materials under Fresh and Brackish Water Conditions

Mobility of Rare Earth Elements in Coastal Aquifer Materials under Fresh and Brackish Water Conditions

The indispensable role of rare earth elements (REEs) in manufacturing high-tech products and developing various technologies has resulted in a surge in REE extraction and processing. The latter, in turn, intensifies the release of anthropogenic REEs into the environment, particularly in the groundwater system. REE contamination in coastal aquifer systems, which serve as drinking and domestic water sources for large populations, demands a thorough understanding of the mechanisms that govern REE transport and retention in these environments. In this study, we conducted batch and column experiments using five representative coastal aquifer materials and an acid-wash sand sample as a benchmark. These experiments were conducted by adding humic acid (HA) to the REE solution under fresh and brackish water conditions using NaCl, representing different groundwater compositions in coastal aquifers. The REEs were shown to be most mobile in the acid-wash sand and natural sand samples, followed by two types of low-carbonate calcareous sandstone and one type of high-calcareous sandstone and the least mobile in red loamy sand. The mobility of REEs, found in solution primarily as REE–HA complexes, was controlled mainly by the retention of HA, which increases with increasing ionic strength and surface area of the aquifer material. Furthermore, it was found that the presence of carbonate and clay minerals reduces the REE mobility due to enhanced surface interactions. The higher recoveries of middle-REE (MREE) in the column experiment effluents observed for the acid-wash sand and natural sand samples were due to the higher stabilization of MREE–HA complexes compared to light-REE (LREE) and heavy-REE (HREE) HA complexes. Higher HREE recoveries were observed for the calcareous sandstones due to the preferred complexation of HREE with carbonate ions and for the red loamy sand due to the preferred retention of LREE and MREE by clay, iron, and manganese minerals.

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来源期刊
ACS Environmental Au
ACS Environmental Au 环境科学-
CiteScore
7.10
自引率
0.00%
发文量
0
期刊介绍: ACS Environmental Au is an open access journal which publishes experimental research and theoretical results in all aspects of environmental science and technology both pure and applied. Short letters comprehensive articles reviews and perspectives are welcome in the following areas:Alternative EnergyAnthropogenic Impacts on Atmosphere Soil or WaterBiogeochemical CyclingBiomass or Wastes as ResourcesContaminants in Aquatic and Terrestrial EnvironmentsEnvironmental Data ScienceEcotoxicology and Public HealthEnergy and ClimateEnvironmental Modeling Processes and Measurement Methods and TechnologiesEnvironmental Nanotechnology and BiotechnologyGreen ChemistryGreen Manufacturing and EngineeringRisk assessment Regulatory Frameworks and Life-Cycle AssessmentsTreatment and Resource Recovery and Waste Management
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