期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 735, 期 -, 页码 1986-1996出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.11.349
关键词
Microfluidic; Hydrothermal method; Magnetic microspheres; Carbonized chitosan; Adsorbent; Organic dyes
资金
- State Key Program of National Natural Science of China [51433008]
- National Natural Science Foundation of China [21704084]
- International Cooperation and Exchanges NSFC [51711530233]
- Fundamental Research Funds for the Central Universities [3102017gx13006, 3102017jc01001]
A novel Fe3O4@SiO2@carbonized chitosan (Fe3O4@SiO2@CCS) porous magnetic microspheres are prepared through the combination technique of microfluidic, ionic crosslinking and hydrothermal carbonization. Modern characterization analysis shows that Fe3O4@SiO2@CCS microspheres are superparamagnetic and exhibit excellent pore performance. The carbonization time is investigated to study its influence on morphology, pore property, component and magnetic performance. Carbonization reaction is carried out from outside to inside and contained hydration condensation process. The as-obtained microspheres are used as adsorbents for removal of organic dyes from water. It is found that the microspheres prepared at 12 h (MSCCS-12) show greater advantage as the adsorbents. The adsorption isotherms can be fitted with Langmuir equation. The maximum adsorption capacity for RhB on MSCCS-12 estimated from the Langmuir model is 191.57 mg g(-1) at 25 degrees C. A distinct advantage of Fe3O4@SiO2@CCS microspheres is that they can readily be isolated from solutions by application of an external magnetic field. The microspheres exhibit excellent reusability. The removal efficiency retained nearly 90% after fifteen successive cycles of reuse. Thus, the novel adsorbent shows potential application value in removal of organic dyes. (C) 2017 Elsevier B.V. All rights reserved.
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