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

• Published in: Materials letters Vol. 64; no. 24; pp. 2752 - 2754
• Main Authors: Xia, Housheng, Lin, Chunxiang, Zhou, Chunhui, Beltramini, Jorge, Tong, Dongshen, Yu, Weihua
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 31.12.2010
• Subjects: Crystal growth; Crystal structure; Hematite; Iron; Iron oxides; Magnetic materials; Nanocomposites; Nanomaterials; Nanoparticles; Nanostructure; Occlusion; Titanosilicate; Zeolite; Crystal growth; Nanoparticles; Titanosilicate; Magnetic materials; Zeolite; Nanocomposites
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2010.08.060

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 × 200 nm × 200 nm. 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 3.7 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.