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  • Efficient and versatile fibrous adsorbent based on magnetic amphiphilic composites of chrysotile/carbon nanostructures for the removal of ethynilestradiol.

Efficient and versatile fibrous adsorbent based on magnetic amphiphilic composites of chrysotile/carbon nanostructures for the removal of ethynilestradiol.

Journal of hazardous materials (2013-02-13)
Ana Paula C Teixeira, Aluir D Purceno, Camila C A de Paula, Julio César C da Silva, José D Ardisson, Rochel M Lago
ABSTRACT

In this work, chrysotile was used as support to grow carbon nanotubes and nanofibers to produce fibrous amphiphilic magnetic nanostructured composites. Iron impregnated on the chrysotile surface at 1, 5 and 15 wt% was used as catalyst to grow carbon nanostructures by CVD (chemical vapor deposition) with ethanol at 800°C. Raman, TG/DTA, Mössbauer, XRD, BET, SEM, TEM, elemental analyses and contact angle measurements suggested the formation of a complex amphiphilic material containing up to 21% of nanostructured hydrophobic carbon supported on hydrophilic Mg silicate fibers with magnetic Fe cores protected by carbon coating. Adsorption tests for the hormone ethynilestradiol (EE), a hazardous water contaminant, showed remarkable adsorption capacities even compared to high surface area activated carbon and multiwall carbon nanotubes. These results are discussed in terms of the hydrophobic surface of the carbon nanotubes and nanofibers completely exposed and accessible for the adsorption of the EE molecules combined with the hydrophilic Mg silicate surface which allows good dispersion in water. The composites are magnetic and after adsorption the dispersed particles can be removed by a simple magnetic process. Moreover, the fibrous composites can be conformed as threads, screens and pellets to produce different filtering media.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
17α-Ethynylestradiol, ≥98%
Supelco
Florisil® Adsorbent for Chromatography, 30-60 mesh
Ethinylestradiol, European Pharmacopoeia (EP) Reference Standard
Supelco
Florisil® Adsorbent for Chromatography, 60-100 mesh
Supelco
17α-Ethynylestradiol solution, 1.0 mg/mL in methanol, ampule of 1 mL, certified reference material, Cerilliant®
Supelco
Florisil®, <200 mesh, fine powder
Supelco
Florisil®, for the determination of hydrocarbon acc. to ISO 9377-2
Supelco
Florisil® PR, PR grade (analysis acc. to FDA)
Sigma-Aldrich
Florisil®, 100-200 mesh
Ethinylestradiol for system suitability, European Pharmacopoeia (EP) Reference Standard
Supelco
Florisil®, 100-200 mesh, fine powder
Supelco
Florisil®, PR grade, 60-100 mesh, coarse powder