シンクロトロン放射光による粘土中に吸着された陽イオンの局所構造の解析 : ストロンチウム (Sr) 原子の吸着を例にして

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This report describes a method of local structure analysis around cation adsorbed in clay using synchrotron X-ray, Beam line 01,Spring8,taking strontium Sr as an example. Sr adsorbed is one in solution of 0.1N SrCl_2 and an adsorbing agent is montmorillonite minerals in Bentonite. EXAFS measurement is carried out on K-edge of Sr in air-dried samples with a dry density 2.0g/(cm)^3 at pH4.7 and 9.6 in transmission mode. An analysis is performed on coordinate numbers of Oxygen atom and inter-atomic distances between Sr and O. The results are cited as followed. The inter-atomic distances nearly equal in both cases of pH. The coordinate number is larger at pH4.7 than at pH9.6. It is supposed that the difference is due to adsorption of cation on both flat surfaces and edges of minerals at pH9.6,while adsorption is performed only on flat surfaces of minerals at pH4.7 and Sr forms the Sr-octahedron with 6 oxygen at edges of minerals in compacted air-dried clays.
神戸大学の論文
2001-02-25