A magnetic zeolitic nanocomposite from occlusion of silica-coated iron species by crystalline titanosilicate-1

A magnetic zeolitic nanocomposite from occlusion of silica-coated iron species by crystalline titanosilicate-1
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由结晶钛硅酸盐-1吸留二氧化硅包覆的铁物质而形成的磁性沸石纳米复合材料

DOI:
10.1016/j.matlet.2010.08.060
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发表时间:
2010-12
期刊:
影响因子:
3
通讯作者:
周春晖
周春晖
中科院分区:
材料科学3区
文献类型:
--
作者:
周春晖

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本文研究了用结晶钛硅酸盐-1包埋二氧化硅包覆的铁物种制备新型磁性沸石纳米复合材料。结果表明,在二氧化硅-赤铁矿纳米粒子的存在下,可以合成结晶良好的TS-1。每个纳米复合材料颗粒表现出一个紧凑的和整体的“砖状”的形态与大小约。400nm×200nm×200nm。在这样的纳米复合材料中的非磁性赤铁矿(氧化铁)可以被氢还原以产生亚铁磁性氧化铁和铁磁性元素铁。所得纳米复合材料由作为外壳的TS-1组成,其包藏作为核心的小部分的硅-铁物种,总磁化强度值为3.7emu/g。氧化硅涂层和尺寸的赤铁矿纳米粒子,碳酸铵的存在下作为结晶介导剂的成核和生长的TS-1是制备这种纳米复合材料时的关键因素。
This paper examines the preparation of novel magnetic zeolitic nanocomposites from the occlusion of silica-coated iron species by crystalline titanosilicate-1. The results revealed that well-crystallized TS-1 could be synthesized in the presence of silica-hematite nanoparticles. Each as-made nanocomposite particle exhibited a compact and monolithic ‘brick-like’ morphology with a size of ca. 400nm×200nm×200nm. The non-magnetic hematite (iron oxide) in such an as-made nanocomposite can be reduced by hydrogen to produce ferrimagnetic iron oxides and ferromagnetic elemental iron. The resultant nanocomposite consists of TS-1 as outer shell, which occludes a small portion of silica-iron species as the core with a total magnetization value of 3.7emu/g. The silica coating and size of hematite nanoparticles, the presence of ammonium carbonate as the crystallization-mediating agent for nucleation and growth of TS-1 are critical factors when preparing such nanocomposites.
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