Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 379, Issue -, Pages 84-88Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2012.04.018
Keywords
Amphiphilic composites; Layered silicates fragments; Ethynilestradiol
Categories
Funding
- FAPEMIG
- PRPq/UFMG
- CNPq
- CAPES
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In this work, hybrid magnetic amphiphilic composites were prepared by the catalytic growth of carbon nanotubes (CNTs) and nanofibers CNF on layered silicates fragments. SEM, TEM, Raman, XRD, Mossbauer, TG/DTA showed that CVD with CH4 at 800 degrees C produced CNF and magnetic Fe cores fixed on the surface of microfragments of silicates layers. Due to the amphiphilic character, the composites can be easily dispersed in water and efficiently adsorb hydrophobic contaminant molecules. For example, the composites showed remarkable adsorption capacities for the hormone ethinylestradiol, e.g. 2-4 mg m(-2), compared to ca. 0.1 mg m(-2) obtained for high surface area activated carbon and multiwall CNT. These results are discussed in terms of a high hydrophobic exposed surface area of the CNT and CNF fixed on the layered silicates fragments surface. Moreover, the composites can be easily removed from water by a simple magnetic separation process. (C) 2012 Elsevier Inc. All rights reserved.
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