Abstract
The adsorptions of polyethylene glycol monomethyl ether (PEGMME) and polyethylene glycol dimethyl ether (PEGDME) on CaA, NaX, NaY, and ZSM-5 zeolites have been analyzed by using experimental FT-IR and Raman spectroscopies. The vibration wavenumbers of polymers adsorbed on zeolites have been reported and the adsorption properties of zeolites with different molecular sizes and cations have been compared. Disappearing of some vibration modes of polymers or shifts to the higher and lower frequency region after the polymers have been adsorbed on zeolites; indicates an interaction between polymers and zeolites. By considering the obtained experimental spectral results we can suggest that the source of adsorption of polymers on zeolites can be based on the interactions between OH groups or oxygen atoms settled in polymer chains and the silanol hydroxyl groups on the surface of each zeolite.
Highlights
The zeolites are crystalline aluminosilicates that exhibit three-dimensional structures interconnecting frameworks of SiO4 and AlO4 tetrahedra, being connected by sharing one oxygen atom between two tetrahedra
This study aims to notice the results of infrared and Raman spectra of two polymers adsorbed on CaA (LTA, type 5A), NaX (FAU, type 13X), NaY (FAU), and ZSM-5 (MFI) synthetic zeolites and the source of adsorption of polyethylene glycol and polyethylene glycol
When the IR and Raman spectra of pure zeolites are compared with the spectra recorded after the adsorption process on zeolites, the observed extra bands are caused by the adsorbed polymers
Summary
The zeolites are crystalline aluminosilicates that exhibit three-dimensional structures interconnecting frameworks of SiO4 and AlO4 tetrahedra, being connected by sharing one oxygen atom between two tetrahedra. Low SiO2 ratio normally provides stronger adsorbance for polar molecules and powerful cation exchange capacity. The unit cells of the synthetic zeolites CaA, NaX, NaY, and ZSM-5 used in this study consist of Ca12[(AlO2)12(SiO2)12].27H2O, Na86[(AlO2)86(SiO2)106].264H2O, Na56[(AlO2)86(SiO2)136].250H2O and NanAlnSi96-nO192.16H2O, respectively (Öztürk et al, 2005; Thomas and Klinowski, 2007; Öztürk et al, 2010). Öztürk et al have investigated the Infrared and SEM analyses of Polyethyleneglycol-400 adsorbed on zeolites NaA, CaA, NaX and NaY zeolites (Öztürk et al, 2009). It seems that our study is in harmony with this study
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