Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 20, Pages 10853-10862Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b01894
Keywords
saponite; organoclay; caffeine adsorption; emerging contaminants; wastewater
Funding
- MEC [PHBP14/00003]
- CAPES [317/15]
- Universidad de Salamanca
- FAPESP [2013/50216-0]
- Ministerio de Economia y Competitividad [MAT2013-47811-C2-R]
- [SAXS 1/16981]
- [SAXS 1/17845]
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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.
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