Effects of Rare Earth Elements’ Physicochemical Properties on Their Stabilization during the Fe(II)aq-induced Phase Transformation of Ferrihydrite,ACS Earth and Space Chemistry

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Effects of Rare Earth Elements’ Physicochemical Properties on Their Stabilization during the Fe(II)aq-induced Phase Transformation of Ferrihydrite
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2019-05-08 00:00:00 , DOI: 10.1021/acsearthspacechem.8b00201
Jian Hua _{1,

2} , Chengshuai Liu _{2,

3} , Fangbai Li ₁ , Zhenke Zhu ₄ , Zhiqi Wei ₁ , Manjia Chen ₁ , Ting Gao ₂ , Guohong Qiu ₅

Affiliation

Ferrihydrite (FHY), a widespread Fe(III) (hydr)oxide, is abundant in earth surface and critical in affecting the environmental behavior of soil elements, such as rare earth elements (henceforth referred to REEs). Under anoxic conditions, the coexisting Fe(II) induces FHY conversion to the minerals with high crystallinity, such as lepidocrocite, goethite, or magnetite, where the phase transformation processes were affected by the coexisting ions. The interactions between REE ions (henceforth referred to Ln(III)) and FHY in the transformation system, however, are still not well understood. We therefore investigated Fe(II)_aq-induced FHY transformation affected by four kinds of Ln(III) (Ce³⁺, Nd³⁺, Tb³⁺, and Lu³⁺). The discernible inhibition was found among the different treatments with different Ln(III), and both the FHY transformation and Fe atom exchange ratios decreased with coexistent Ln(III) that have larger atomic number. In this study, the Fe atom exchange ratios with different coexistent Ln(III) were linearly negatively depended on the molar enthalpy values of Ln(III), which are explained by the molar enthalpy considered to be important in affecting the adsorption behaviors of Ln(III). Furthermore, the adsorption behaviors can affect the incorporation efficiency of the Ln(III), so as to affect the Fe atom exchange and FHY phase transformation. The Ln(III) with larger atomic number can be stabilized more, which results from the effects of incompatible REEs in determining the efficiency of immobilizing Ln(III) in the transformed iron (hydr)oxides. Our research suggested the important role of FHY in the distribution of REEs and the key properties of REEs in affecting their different distribution characteristics in earth surface environments.

中文翻译：

Fe（II）_aq引起的水铁矿相变过程中稀土元素的理化性质对其稳定化的影响

水铁矿（FHY）是一种分布广泛的Fe（III）（氢）氧化物，在地球表面非常丰富，对于影响土壤元素（如稀土元素）的环境行为至关重要（此后称为REE）。在缺氧条件下，共存的Fe（II）导致FHY转化为具有高结晶度的矿物，如纤铁矿，针铁矿或磁铁矿，其中相变过程受共存离子的影响。然而，人们对转化系统中REE离子（以下简称Ln（III））和FHY之间的相互作用还不甚了解。因此，我们研究的Fe（II）_水性诱导FHY受4种LN（III）（铈改造³⁺，钕³⁺，铽³⁺，和卢³⁺）。在具有不同Ln（III）的不同处理之间发现了明显的抑制作用，并且当原子序数更大的Ln（III）共存时，FHY转化率和Fe原子交换率均降低。在这项研究中，不同共存的Ln（III）的Fe原子交换率与Ln（III）的摩尔焓值呈线性负相关，这可以通过摩尔焓值来解释，这对影响Ln（III）的吸附行为很重要。 III）。此外，吸附行为会影响Ln（III）的结合效率，从而影响Fe原子交换和FHY相变。具有更大原子序数的Ln（III）可以更稳定，这是由于不相容的REE决定了将Ln（III）固定在转化的铁（氢）氧化物中的效率所致。

更新日期：2019-05-08

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