Nanostructured mesoporous magnetic (m-Fe 3 O 4 ) particles are promising candidate materials for separation, detoxification, and precious metal recovery. The silanation of m-Fe 3 O 4 particles using 3-aminopropyltriethoxysilane is described. The silanized films were characterized using XPS, diffuse-reflectance FTIR spectroscopy, and electrokinetic techniques. The loading capacity of the silanized m-Fe 3 O 4 particles was found to be superior to that of m-Fe 3 O 4 or directly silanized Fe 3 O 4 particles. Extraction and separation of transition metals (II) were investigated using the silanized m-Fe 3 O 4 particles. The effectiveness of metal (II) extraction was found to increase with increasing solution pH, but was less effective at pH below 2. Satisfactory separation with loading efficiency in the order of Cu 2+ > Ni 2+ > Zn 2+ was obtained. The adsorbed metals were successfully desorbed with 1 M aqueous HCl solutions. As a result, the recovered m-Fe 3 O 4 particles can be recycled in industrial applications.
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Wu et al. (2005) studied this question.
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