Comprehension of paraquat adsorption on faujasite zeolite X and Y in sodium form

The nature of paraquat adsorption is compared between zeolite NaX and NaY which have the same faujasite structure but different Si/Al ratio, namely 1.2 and 2.2, respectively. The adsorption was proposed to occur via ion exchange and expected to increase with Al content. However, NaX had a lower para...

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Published inAdsorption science & technology Vol. 36; no. 1-2; pp. 684 - 693
Main Authors Rongchapo, Wina, Keawkumay, Chalermpan, Osakoo, Nattawut, Deekamwong, Krittanun, Chanlek, Narong, Prayoonpokarach, Sanchai, Wittayakun, Jatuporn
Format Journal Article
LanguageEnglish
Published London, England SAGE Publications 01.02.2018
Sage Publications Ltd
Subjects
Adsorption
Aluminum
Fourier transforms
Infrared analysis
Infrared spectroscopy
Ion exchange
NMR
NMR spectroscopy
Nuclear magnetic resonance
Paraquat
Photoelectron spectroscopy
Photoelectrons
Silicon
Sodium
Spectrum analysis
X ray photoelectron spectroscopy
Zeolites
Paraquat
adsorption
NaX
faujasite zeolite
NaY
ion exchange
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Summary:The nature of paraquat adsorption is compared between zeolite NaX and NaY which have the same faujasite structure but different Si/Al ratio, namely 1.2 and 2.2, respectively. The adsorption was proposed to occur via ion exchange and expected to increase with Al content. However, NaX had a lower paraquat adsorption capacity than NaY. The bare and paraquat-containing zeolites (PQX and PQY) were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, N2 adsorption–desorption analysis, magic-angle spinning nuclear magnetic resonance (MAS) NMR, and X-ray photoelectron spectroscopy. The presence of adsorbed paraquat was confirmed by Fourier transform infrared spectroscopy. Paraquat adsorbed in supercages of the zeolites resulting in a decrease of surface area and displacement of sodium cations. Results from 23Na MAS NMR and X-ray photoelectron spectroscopy indicated that interaction of sodium ions in the cavity of NaX was stronger than that in NaY, making it less exchangeable with paraquat.
ISSN:0263-6174
2048-4038
DOI:10.1177/0263617417715394