Macroscopic and spectroscopic investigations on Eu(III) and Cm(III) sorption onto bayerite (beta-AlH)(3)) and corundum (alpha-Al2O3)

Kupcik Tomas; Rabung Thomas; Luetzenkirchen Johannes; Finck Nicolas; Geckeis Horst; Fanghaenel Thomas

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Macroscopic and spectroscopic investigations on Eu(III) and Cm(III) sorption onto bayerite (beta-AlH)(3)) and corundum (alpha-Al2O3)

机译：宏观和光谱研究Eu（III）和Cm（III）吸附到三羟铝石（beta-AlH）（3）和刚玉（alpha-Al2O3）上

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The interaction of trivalent Cm and Eu with the aluminum hydroxide bayerite (beta-Al(OH)(3)) and the aluminum oxide corundum (alpha-Al2O3) was investigated by batch sorption experiments and time resolved laser fluorescence spectroscopy (TRLFS). The experimental methods for both polymorphs show similar pH dependent sorption behavior at trace metal ion concentrations (similar to 10(-7) M), i.e. similar Eu sorption edges and nearly identical Cm speciation between pH = 3 and 13. In this pH range the Cm aquo ion as well as the Cm(III) surface species surface...Cm(OH)(x)(H2O)(5), (x = 0, 1,2) can be distinguished by TRLFS. The similar sorption data point to a (surface) transformation of the thermodynamically unstable Al2O3 surface into bayerite, in agreement with the similar isoelectric points obtained for both minerals (PHIEP = 8.6-8.8). The pH dependent surface charge is most likely due to the protonation/deprotonation of singly coordinated Al-OH surface groups, prevailing on the edge planes of the rod-like bayerite crystals and the surface of the colloidal Al2O3 particles. These surface groups are also believed to act as ligands for lanthanide/actinide(III) surface complexation. In contrast to the similar sorption behavior at trace metal ion concentrations, discrepancies are observed at higher Eu levels. While similar sorption edges occur up to 7 x 10(-7) M Eu for corundum, the pH edge on bayerite is gradually shifted to higher pH values in this Eu concentration range. The latter behavior may be related either to the existence of multiple sorption sites with different sorption affinities, or to the influence of an additional amorphous Al-phase, forming in the course of the bayerite synthesis. (C) 2015 Elsevier Inc. All rights reserved.

机译：通过分批吸附实验和时间分辨激光荧光光谱（TRLFS）研究了三价Cm和Eu与氢氧化铝钠铝石（β-Al（OH）（3））和氧化铝刚玉（α-Al2O3）的相互作用。两种多晶型物的实验方法在痕量金属离子浓度（类似于10（-7）M）下都表现出相似的pH依赖性吸附行为，即相似的Eu吸附边和在pH = 3和13之间几乎相同的Cm形态。 Cm水族离子以及Cm（III）表面物种表面... Cm（OH）（x）（H2O）（5），（x = 0，1,2）可以通过TRLFS进行区分。相似的吸附数据表明，热力学不稳定的Al2O3表面（表面）转变为三钠铝石，这与两种矿物获得的相似的等电点一致（PHIEP = 8.6-8.8）。 pH依赖性表面电荷最可能是由于单配位Al-OH表面基团的质子化/去质子化，普遍存在于棒状三方晶晶体的边缘平面和胶体Al2O3颗粒的表面上。还认为这些表面基团充当镧系元素/ act系元素（III）表面络合的配体。与痕量金属离子浓度下相似的吸附行为相反，在较高的Eu含量下观察到差异。当刚玉达到7 x 10（-7）M Eu时，会出现相似的吸附边，而在此Eu浓度范围内，三钠铝石的pH边逐渐移至更高的pH值。后者的行为可能与存在具有不同吸附亲和力的多个吸附位点有关，或者与在三羟铝石合成过程中形成的其他无定形Al相的影响有关。（C）2015 Elsevier Inc.保留所有权利。

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《Journal of Colloid and Interface Science 》 |2016年第null期| 共10页
作者
Kupcik Tomas; Rabung Thomas; Luetzenkirchen Johannes; Finck Nicolas; Geckeis Horst; Fanghaenel Thomas;
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正文语种 eng
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Bayerite; Corundum; Curium; Europium; Aluminum oxides; Aluminum hydroxides; Sorption; Time resolved laser fluorescence spectroscopy (TRLFS); lsoelectric point;

机译：硅铝石;刚玉;C;Euro;铝氧化物;氢氧化铝;吸附;时间分辨激光荧光光谱法（TRLFS）;等电点;

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1. Macroscopic and spectroscopic investigations on Eu(III) and Cm(III) sorption onto bayerite (beta-AlH)(3)) and corundum (alpha-Al2O3) [J] . Kupcik Tomas, Rabung Thomas, Luetzenkirchen Johannes, Journal of Colloid and Interface Science . 2016 ,第Null期

机译：宏观和光谱研究Eu（III）和Cm（III）吸附到三羟铝石（beta-AlH）（3）和刚玉（alpha-Al2O3）上
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4. Solution Chemistry of Cm(III) and Eu(III) in Ionic Liquids [C] . S. Stumpf, 1. Billard, P. J. Panak American Chemical Society . 2007

机译：CM（III）和EU（III）的溶液化学在离子液体中
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Macroscopic and spectroscopic investigations on Eu(III) and Cm(III) sorption onto bayerite (beta-AlH)(3)) and corundum (alpha-Al2O3)

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