Abstract Sorption has been proposed as a promising approach towards a sustainable water decontamination and recently to the recycling of rare earth elements (REE). Although living seaweed have been shown to be capable of removing REE from contaminated solutions, no studies have yet compared the effects of REE competition on sorption onto different groups of seaweed. These effects were analysed in the present study by exposing six living seaweed (Ulva lactuca, Ulva intestinalis, Fucus spiralis, Fucus vesiculosus, Gracilaria sp. and Osmundea pinnatifida) (3 g/L, fresh weight) to mono-element and multi-element solutions of Y, La, Ce, Pr, Nd, Eu, Gd, Tb and Dy (1 μmol/L). Results show a preference towards Light REE in mono-element solutions, which is reduced when in competition with other REE. The competitive effect is less pronounced in heavy REE indicating that these are still able to bind to the macroalgae despite of the presence of competing ions. Contrary to water content (%), seaweed specific surface area (cm2 g–1) shows to be an important factor in the sorption of REE, since larger surface area is associated to higher removal and larger competitive effect.

中文翻译：

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稀土元素在六种海藻上的吸附竞争*

摘要 吸附已被提议作为实现可持续水净化和最近回收稀土元素 (REE) 的一种有前景的方法。虽然活的海藻已被证明能够从受污染的溶液中去除 REE，但还没有研究比较 REE 竞争对不同海藻组吸附的影响。在本研究中，通过将 6 种活海藻（石菖蒲、肠石荠、海角藻、墨角藻、江蓠 sp. 和 Osmundea pinnatifida）（3 克/升，鲜重）暴露于单元素和多元素中来分析这些影响Y、La、Ce、Pr、Nd、Eu、Gd、Tb 和 Dy 的溶液 (1 μmol/L)。结果显示在单元素溶液中偏爱轻 REE，当与其他 REE 竞争时，这种偏好会降低。重 REE 中的竞争效应不太明显，表明尽管存在竞争离子，但它们仍然能够与大型藻类结合。与含水量 (%) 相反，海藻比表面积 (cm2 g-1) 是 REE 吸附的重要因素，因为更大的表面积与更高的去除率和更大的竞争效应相关。