Creation of new environmental clean-up material by effect of size of layered double hydroxide

在Mg-Al和Fe-Zn体系中合成了晶粒尺寸小于20 nm的层状双氢氧化物（LDH）。LDHs能有效地吸附和固定排水中的有害负离子。在Fe-Zn系Zn端元附近的点上选择性地形成具有桥结构的硅锰钾石型材料，并且对Cr（VI）离子具有选择性。此外，通过重组方法，在具有吸附和交换率约95%的原LDH中显示出重现性。

Layered double hydroxide (LDH) adjusted the crystallite size to less than 20nm was synthesized in Mg-Al and Fe-Zn systems. The LDHs were able to adsorb and to fix the contained harmful negative ions in drainage effectively. The simonkolleite type material that had the bridge structure was selectively formed in a point near the Zn end member of the Fe-Zn system, and selectivity was admitted for Cr (VI) ion. Moreover, it was shown to reproduce in former LDH that had adsorption and the exchangeability of about 95% by the restructuring method.