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 shu

Double-Layer SiO₂ Encapsulated Fe₃O₄ Composite： Preparation and Dye Absorption Properties

LIU Yun-Fang ^1,2,, ,
REN Sen ¹ ,
WU Ri-Liang ¹ ,
LI Yang-Yang ¹ ,
SHI Xiang-Hui ¹ ,
CHI Wei-Dong ^1,2 ,
HUANG Qi-Gu ^1,2,,

1.
1 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2.
2 Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China

Corresponding author: LIU Yun-Fang, HUANG Qi-Gu,
Received Date: 1 July 2015
Available Online: 12 October 2015
Fund Project: 国家自然科学基金(No.21174011, U1462102) (No.21174011, U1462102) 中央高校基本科研业务费项目(JD1406)资助。 (JD1406)

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.
- Fe₃O₄;SiO₂;magnetic property;porous structure;absorption property
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Double-Layer SiO₂ Encapsulated Fe₃O₄ Composite： Preparation and Dye Absorption Properties