Abstract
A magnetic composite of a meixnerite (Mg-Al-OH) type layered double hydroxide (LDH) and magnetite (Fe3O4), abbreviated as Fe3O4@(Mg-Al-OH LDH), was successfully synthesized by a mechanochemical route with a two-step milling operation. In the first step, the mixture of Mg(OH)2, Al(OH)3 and Fe3O4 as the starting materials was milled without water for 1h, and then with addition water for another 5h in the second step. The so-synthesized composite has the structure of Fe3O4 cores homogeneously dispersed in the LDH matrix and demonstrates super-paramagnetic behavior. This mechanochemical process provides a facile and environmentally safe method for synthesizing magnetic composites based on LDHs.
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