Characterization of the sorption of europium(III) on calcite by site-selective and time-resolved luminescence spectroscopy
Characterization of the sorption of europium(III) on calcite by site-selective and time-resolved luminescence spectroscopy
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DOI：
10.1006/jcis.1997.5115
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发表时间：
1997-10-15
影响因子：
9.9
通讯作者：
Bercis, L
中科院分区：
文献类型：
--
作者：
Piriou, B;Fedoroff, M;Bercis, L
用323K下的动力学和吸附等温线以及15K下的位置选择性和时间分辨发光光谱研究了Eu(III)在方解石水溶液中的吸附。B构成了一个主要的家族，它出现在所有吸附了Eu的样品中，其特征是环境中含有水或羟基离子。只有在Eu浓度最高的情况下才能观察到C家族。在这些地点，环境比地点B更潮湿。地点A是少数，但在所有样本中都有出现。与方解石在2b位置的中心对称结构钙位置相对应，说明吸附的Eu(III)可以替代方解石中的钙。(C)1997年学术出版社。
Sorption of europium(III) on calcite from aqueous solution was investigated by kinetics and sorption isotherms at 323 K and by site-selective and time-resolved luminescence spectroscopy at 15 K. Three sorption sites (A, B, C) were characterized by this last technique. B constitutes a major family which appears in all samples with sorbed Eu and is characterized by an environment involving water or hydroxyl ions. The C family is observed only for the highest Eu concentrations. In these sites, the environment is more hydrated than in sites B. Site A constitutes a minority but appears in all samples. It corresponds to the centrosymmetric structural Ca site of calcite in position 2b, thus demonstrating that sorbed Eu(III) can substitute for Ca in calcite. (C) 1997 Academic Press.