Ion-exchange and Structural Properties of Magadiite
Ion-exchange and Structural Properties of Magadiite
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DOI：
10.11362/jcssjclayscience1960.12.supplement2_37
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发表时间：
2006-04
期刊：
影响因子：
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通讯作者：
Y. Murakami;Masafumi Nanba;Shouji Tagashira;Yoshiaki Sasaki
中科院分区：
文献类型：
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作者：
Y. Murakami;Masafumi Nanba;Shouji Tagashira;Yoshiaki Sasaki
研究了水介质中钠镁铁矿与H+、K+、Mg2+、Ca2+、Sr2+、Ba2+、Cu2+、Zn2+等金属阳离子的离子交换反应。H+离子和除镁以外的所有二价金属离子在具有化学计量比金属离子的水溶液中与Na+交换。K+、Mg~(2+)与钠镁铁矿的反应活性较差。即使K+或Mg2+浓度是Na+浓度的100倍，也不能完全取代Na+。Cu2+对离子交换反应的pH依赖性与其他金属离子不同。X射线衍射分析表明，钠镁铁矿的结构与铜氢镁铁矿的结构不同。这些差异是由于H+或Cu2+在与硅酸盐片中的氧原子相互作用中采用不同的几何构型而引起的硅酸盐片的结构变化。乙二胺和五乙烯六胺与Cu2+形成稳定的阳离子络合物：具有平面结构的铜(En)2和具有八面体结构的铜(五烯)。X-射线衍射谱均显示金属-镁闪锌矿的基面间距与金属的晶态离子直径和H-镁闪锌矿的基面间距之和不同。在过量络合物存在的情况下，Na仍留在镁铁矿层间。金属阳离子的脱水程度取决于镁闪石的离子交换活性。
The ion-exchange reactions of Na-magadiite with metal cations such as H+, K+, Mg2+, Ca2+, Sr2+, Ba2+, Cu2+ and Zn2+ were studied in an aqueous medium. The H+ ion and all divalent metal ions except Mg2+ exchanged with Na+ in an aqueous solution with a stoichiometric amount of the metal ion. K+ and Mg2+ showed poor reactivity with the Na-magadiite. Na+ was not fully replaced even with a K+ or Mg2+ concentration that was 100 times the Na+ concentration. The pH dependence of Cu2+ for the ion-exchange reaction was different from that of other metal ions. XRD analysis revealed that the structure of the Na-magadiite differed from the Cuor H-magadiite. These differences arose from structural changes in the silicate sheet due to the H+ or Cu2+ adopting a different geometry in interaction with the oxygen atoms in the silicate sheet. Ethylene diamine (en) and pentaethylene hexamine (pentaen) react with Cu2+ to form stable cationic complexes: Cu(en)2, which has a planar structure, and Cu(pentaen), which has an octahedral structure. The XRD patterns all revealed a difference between the basal spacings of the metal-magadiite and the sum of the crystalline ionic diameter of the metal and basal spacing of the H-magadiite. Na remained in the interlayer of the magadiite in the presence of excess complexes. The degree of dehydration of the metal cation depends on the ion-exchange reactivity of the magadiite.