Adsorption of the harmful hormone ethinyl estradiol inside hydrophobic cavities of CTA+ intercalated montmorillonite
| Autor: | Tatiana A. Ribeiro-Santos, A. E. Burgos, Rochel M. Lago |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Environmental Engineering
Intercalation (chemistry) Inorganic chemistry Energy-dispersive X-ray spectroscopy 02 engineering and technology 010501 environmental sciences Ethinyl Estradiol 01 natural sciences Water Purification Contact angle chemistry.chemical_compound Adsorption X-Ray Diffraction Bromide 0105 earth and related environmental sciences Water Science and Technology Spectrometry X-Ray Emission 021001 nanoscience & nanotechnology Thermogravimetry Montmorillonite chemistry Bentonite Cetrimonium Compounds Microscopy Electron Scanning 0210 nano-technology Water Pollutants Chemical |
| Zdroj: | Water Science and Technology. 74:663-671 |
| ISSN: | 1996-9732 0273-1223 |
| DOI: | 10.2166/wst.2016.207 |
| Popis: | Hydrophobic cavities produced by cetyltrimethylammonium cation (CTA+) exchanged and trapped in the interlayer space of montmorillonite were used to remove the harmful hormone contaminant ethinyl estradiol (EE2) from water. X-ray diffraction, thermogravimetry/derivative thermogravimetry, elemental analysis (carbon, hydrogen, nitrogen), Fourier transform infrared, scanning electron microscopy/energy dispersive spectroscopy, Brunauer–Emmett–Teller and contact angle analyses showed that the intercalation of 9, 16 and 34 wt% CTA+ in the montmorillonite resulted in the d001 expansion from 1.37 to 1.58, 2.09 and 2.18 nm, respectively. EE2 adsorption experiments showed that the original clay montmorillonite does not remove EE2 from water whereas the intercalated composites showed high efficiency with adsorption capacities of 4.3, 8.8 and 7.3 mg g−1 for M9CTA+, M16CTA+ and M34CTA+, respectively. Moreover, experiments with montmorillonite simply impregnated with cetyltrimethylammonium bromide showed that the intercalation of CTA+ to form the hydrophobic cavity is very important for the adsorption properties. Simple solvent extraction can be used to remove the adsorbed EE2 without significant loss of CTA+, which allows the recovery and reuse of the adsorbent for at least five times. |
| Databáze: | OpenAIRE |
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