Adsorptive performance and catalytic activity of superparamagnetic Fe3O4@nSiO2@mSiO2 core-shell microspheres towards DDT.
Due to specific properties, core-shell Fe3O4@SiO2 and core-shell-shell Fe3O4@nSiO2@mSiO2 nanostructures have been extensively investigated for the contamination treatment of wastewater. However, these reported materials were usually used as advanced adsorbents or catalyst-supports. In this study, we demonstrate that magnetic mesoporous silica Fe3O4@nSiO2@mSiO2 microspheres can not only exhibit excellent adsorptive performance for removal of DDT (1,1,1-trichloro-2,2-bis(4-chlorophenyl) ethane) from aqueous media, but also display high catalytic activity. Over 97% of DDT could be quickly removed from aqueous media in 60 min. At 60°C the DDE (1,1-dichloro-2,2-bis(4-chlorophenyl) ethylene) content increases greatly as DDT disappears completely, and is decomposed completely after thermal treatment at a relatively low temperature of 450°C. The obtained magnetic mesoporous silica nanoparticles were characterized by X-ray diffraction, transmission electron microscopy, nitrogen adsorption-desorption measurements and vibrating sample magnetometer. The results indicate that Fe3O4@nSiO2@mSiO2 microspheres show strong superparamagnetism and have high specific surface area (577 m(2) g(-1)).
Functional Nanomaterials Laboratory and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China; School of Chemical & Environmental Engineering, China University of Mining & Technology, Beijing 100083, China.
Feng
F
Liu
Functional Nanomaterials Laboratory and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China.
Hua
H
Tian
Functional Nanomaterials Laboratory and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China. Electronic address: jhhe@mail.ipc.ac.cn.
Junhui
J
He
Adsorption; Catalytic dechlorination; DDT; Magnetic mesoporous silica