实验参数对铁酸锰纳米颗粒吸附稀土元素行为的影响

João Pinto, Daniela Branco, Lina Carvalho, Bruno Henriques, Rosa Freitas, Tito Trindade, Daniela Tavares, Eduarda Pereira
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引用次数: 0

摘要

稀土元素(REE)在许多技术中几乎是不可替代的,但其供应受到地缘政治因素的限制。此外,它们的开采和提炼带来了严重的环境后果。因此,最近尝试了通过吸附等方法来替代这些元素的来源。纳米粒子是特殊的稀土吸附剂,然而,吸附后材料分离的困难激发了人们对磁性纳米粒子的兴趣,磁性纳米粒子可以通过施加外部磁场很容易地从溶液中分离出来。在本研究中,我们探讨了吸附剂用量、pH值和基质复杂性对铁酸锰纳米颗粒(MnFe2O4)去除九种稀土(Y、La、Ce、Pr、Nd、Eu、Gd、Tb和Dy)三价阳离子的影响;本文使用缩写REE来表示包括三价阳离子的这些元素。随着吸附剂投加量的增加和pH值的增加,稀土元素的去除率也随之增加。在pH值为6和8时,单元素溶液中稀土元素的去除率超过90%。当pH < 4时,由于吸附剂表面带正电荷,不利于与阳离子REE相互作用,其去除率低于10%。随着基质复杂性的增加,水中稀土元素的去除率明显下降,这可能是由于总稀土浓度的增加和吸附剂中吸附位点的数量有限。据报道,在离子强度增加的情况下(矿物质和盐水),可能是由于与Na+的竞争,进一步的吸附抑制作用可能限制了该材料在复杂基质中的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Influence of experimental parameters on the sorption behavior of Rare Earth Elements on manganese ferrite nanoparticles

Influence of experimental parameters on the sorption behavior of Rare Earth Elements on manganese ferrite nanoparticles
Rare Earth Elements (REE) are nearly irreplaceable in many technologies, but their supply is limited by geopolitical factors. Additionally, their exploration and refinement bring serious environmental consequences. As such, alternative sourcing of these elements through methods such as sorption has recently been attempted. Nanoparticles are exceptional REE sorbents, however, difficulties in material separation post-sorption have fueled an interest in the use of magnetic nanoparticles, which can be easily separated from the solution by applying an external magnetic field. In this study, we explore the influence of sorbent dosage, pH and matrix complexity in the removal of trivalent cations of nine REE (Y, La, Ce, Pr, Nd, Eu, Gd, Tb and Dy) using manganese ferrite nanoparticles (MnFe2O4); herein the abbreviation REE is employed to indicate such elements including the trivalent cations. The REE removal increased for higher sorbent dosages and pH. More than 90% of REE in mono-elemental solutions were removed from water at pH 6 and 8. Removal below 10% was observed for pH < 4, due to the positive surface charge of the sorbent which did not favor interaction with cationic REE species. Increasing the complexity of the matrix, the removal of REE from water decreased considerably, which can be attributed an increase of total REE concentration and the limited number of sorption sites in the sorbent. Further sorption inhibition was reported in increased ionic strength scenarios (mineral and saline water), possibly due to competition with Na+, which may limit the application of this material in complex matrices.
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