1. Organically Modified Saponites: SAXS Study of Swelling and Application in Caffeine Removal.
- Author
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Marçal L, de Faria EH, Nassar EJ, Trujillano R, Martín N, Vicente MA, Rives V, Gil A, Korili SA, and Ciuffi KJ
- Subjects
- Adsorption, Caffeine chemistry, Nanoparticles chemistry, Nanoparticles ultrastructure, Particle Size, Scattering, Small Angle, Water Pollutants, Chemical isolation & purification, Aluminum Silicates chemistry, Caffeine isolation & purification, Organic Chemicals chemistry, Water Purification methods, X-Ray Diffraction methods
- Abstract
This study aimed to assess the capacity of saponite modified with n-hexadecyltrimethylammonium bromide (CTAB) and/or 3-aminopropyltriethoxysilane (APTS) to adsorb and remove caffeine from aqueous solutions. Powder X-ray diffraction (PXRD) revealed increased basal spacing in the modified saponites. Small-angle X-ray scattering (SAXS) confirmed the PXRD results; it also showed how the different clay layers were stacked and provided information on the swelling of natural saponite and of the saponites functionalized with CTAB and/or APTS. Thermal analyses, infrared spectroscopy, scanning electron microscopy, element chemical analysis, and textural analyses confirmed functionalization of the natural saponite. The maximum adsorption capacity at equilibrium was 80.54 mg/g, indicating that the saponite modified with 3-aminopropyltriethoxysilane constitutes an efficient and suitable caffeine adsorbent.
- Published
- 2015
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