Naveau Aude, Monteil-Rivera Fanny, Dumonceau Jacques, Boudesocque Stéphanie
Université de Reims, GRECI, Chimie de Coordination aux Interfaces, BP 1039, 51687 Reims cedex 2, France.
J Contam Hydrol. 2005 Mar;77(1-2):1-16. doi: 10.1016/j.jconhyd.2004.10.002.
An experimental and theoretical study of Eu(III) sorption on goethite surface was performed in the presence of different background electrolytes (NaCl, NaNO3, KNO3). Results were described using a simple surface complexation, the double-layer model (DLM), and calculations were performed using either Fiteql3.2 or Jchess codes. The surface acidity constants and sites density were first determined by potentiometric titrations. The influence of electrolyte ions on the value of point of zero charge was studied by both potentiometric and electrokinetic measurements in order to assess their possible retention on goethite. The sorption of Eu(III) was then investigated by the batch method, in the three background electrolytes, as a function of pH. The presence of electrolyte ions was found to decrease the immobilization of Eu on goethite. Sorption results were modelled considering ternary surface complexes (goethite surface/europium/electrolyte ions).
在不同背景电解质（NaCl、NaNO₃、KNO₃）存在的情况下，对Eu(III)在针铁矿表面的吸附进行了实验和理论研究。使用简单的表面络合、双层模型（DLM）对结果进行了描述，并使用Fiteql3.2或Jchess代码进行了计算。首先通过电位滴定法确定了表面酸度常数和位点密度。通过电位滴定和电动测量研究了电解质离子对零电荷点值的影响，以评估它们在针铁矿上的可能保留情况。然后采用分批法在三种背景电解质中研究了Eu(III)的吸附情况，作为pH的函数。发现电解质离子的存在会降低Eu在针铁矿上的固定化。吸附结果采用三元表面络合物（针铁矿表面/铕/电解质离子）进行建模。
