Lehrstuhl für Hydrogeologie, Institut für Geowissenschaften, Friedrich-Schiller-Universität Jena, Burgweg 11, D-07749 Jena, Germany.
J Colloid Interface Sci. 2013 Sep 1;405:44-50. doi: 10.1016/j.jcis.2013.05.041. Epub 2013 Jun 1.
Cryptomelane-type octahedral molecular sieves (K-OMS-2) were successfully synthesized at ambient pressure and temperature by a simple one-step reaction pathway. We designed three synthesis mixes based on redox reactions of either MnSO4 or MnCl2 together with KMnO4 in aqueous solution. The synthesis products were characterized structurally (XRD, FTIR spectroscopy), morphologically (SEM, BET surface area), and chemically (SEM-EDX, ICP-OES). For all mixes, a precursor octahedral layered K-birnessite (K-OL-1) was formed after 1d that subsequently transformed into K-OMS-2. This transformation process depends on the pH of the reaction solution, the respective Mn(II) salt and time. We obtained K-OMS-2 materials with BET surface areas between 50.4 and 104.5 m(2) g(-1) and different crystallinities. The described method is reliable, reproducible, easy to handle and may be the basis to produce well defined Mn oxides that could be used for remediation and catalysis purposes.
通过简单的一步反应途径，在常压和温度下成功合成了八面体型分子筛（K-OMS-2）。我们设计了三种基于 MnSO4 或 MnCl2 与 KMnO4 在水溶液中的氧化还原反应的合成混合物。通过结构（XRD、FTIR 光谱）、形态（SEM、BET 表面积）和化学（SEM-EDX、ICP-OES）对合成产物进行了表征。对于所有混合物，在 1d 后形成了前驱体八面体层状 K-钠锰矿（K-OL-1），随后转化为 K-OMS-2。这种转化过程取决于反应溶液的 pH 值、各自的 Mn(II)盐和时间。我们获得了 BET 表面积在 50.4 到 104.5 m(2) g(-1)之间且结晶度不同的 K-OMS-2 材料。该方法可靠、可重复、易于操作，可能是制备具有明确结构的 Mn 氧化物的基础，这些氧化物可用于修复和催化目的。
