Citation: LIU Yun-Fang, REN Sen, WU Ri-Liang, LI Yang-Yang, SHI Xiang-Hui, CHI Wei-Dong, HUANG Qi-Gu. Double-Layer SiO2 Encapsulated Fe3O4 Composite: Preparation and Dye Absorption Properties[J]. Chinese Journal of Inorganic Chemistry, ;2015, (12): 2373-2378. doi: 10.11862/CJIC.2015.302
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Double-layer SiO2 encapsulated Fe3O4 composite was prepared by a modified Stober method. The structures and properties of the composite were characterized by TEM, XRD, VSM and N2 absorption-desorption experiment, and its dye absorption properties were also investigated. This material possesses a BET surface area of 308 m2·g-1 and saturation magnetization of 45.5 emu·g-1. When the rhodamine B (RhB) concentration increases from 25 mg·L-1 to 250 mg·L-1, the RhB saturated absorption capacity of this composite increases from 24.0 mg· g-1 to 112.4 mg·g-1. When the methyl blue (MB) concentration increases from 25 mg·L-1 to 500 mg·L-1, the MB saturated absorption capacity of this composite increases from 22.0 mg·g-1 to 235.1 mg·g-1. With the increasing of pH value, the RhB absorption capacity increases, while that value of MB has no obvious change. The temperature in range of 20~40 ℃ is in favor of dye absorption for the composite.
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