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

作者：Xia, Housheng; Lin, Chunxiang; Zhou, Chunhui^*; Beltramini, Jorge; Tong, Dongshen; Yu, Weihua

来源：Materials Letters, 2010, 64(24): 2752-2754.

DOI：10.1016/j.matlet.2010.08.060

• Crystal growth
• Magnetic materials
• Nanocomposites
• Titanosilicate
• Nanoparticles
• Zeolite

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. 400 nm x 200 nm x 200 nm. The nonmagnetic 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 3.7 emu/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.

• 出版日期2010-12-31
• 单位浙江工业大学