FTIR spectra of a) Na -montmorillonite; b) and d) HDTMA bromide; c) montmorillonites modified with different concentrations of HDTMA cation; e) montmorillonites modified with different concentrations of PTMA cation; f) PTMA chloride.

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... information on the interactions between S-metolachlor and the inorganic and organic montmorillonite was obtained by using infrared spectroscopy. In the spectrum of NaM (Fig. 1a), the absorption band at 3626 cm -1 was assigned to stretching vibrations of structural OH groups, while the absorption bands at 3447 cm -1 and 1643 cm -1 were assigned to stretching and bending vibrations of water molecules in interlayer space (Tomić et al., 2015). The most intensive band in the spectrum at 1034 cm -1 was assigned to ...

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... The most intensive band in the spectrum at 1034 cm -1 was assigned to stretching Si-O vibrations of the tetrahedral sheet. Absorption bands, which originate from Al-Al-OH and Al-Fe-OH bending vibrations, are located around 916 and 871 cm -1 , and they are typical for mineral montmorillonite (Madejova, 2003;Tomić et al, 2012). show two bands (Fig. 1a). Band at 3425 cm −1 was attributed to the symmetric ν1(H2O) and asymmetric ν3(H2O) stretching vibrations, while band at 3223 cm −1 represent overtone of bending vibrations (2ν2(H2O)) (He et al., 2007). At the spectrum of the HDTMA bromide, in the region from 3050-2800 cm −1 , several bands occur (Fig. 1b). Shoulder at 3030 cm −1 and ...

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... 2003;Tomić et al, 2012). show two bands (Fig. 1a). Band at 3425 cm −1 was attributed to the symmetric ν1(H2O) and asymmetric ν3(H2O) stretching vibrations, while band at 3223 cm −1 represent overtone of bending vibrations (2ν2(H2O)) (He et al., 2007). At the spectrum of the HDTMA bromide, in the region from 3050-2800 cm −1 , several bands occur (Fig. 1b). Shoulder at 3030 cm −1 and band at 3018 cm −1 represent νas(N-CH3 ) vibrations ( Madejova et al., 2009), although some authors state that this band at 3018 cm −1 originate from νs(N-CH3) vibrations ( Li et al., 2008). Shoulder at 2945 cm −1 originates from overlapping νs(N-CH3) with νas(CH3) vibrations ( Madejova et al., 2009). A ...

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... interaction of NaM with HDTMA + cations caused the formation of new bands (Fig. 1c). Strong bands at 2925-2927 cm -1 and 2852-2854 cm -1 were assigned to asymmetric and symmetric stretching vibrations of CH2 group respectively ( Tomić et al., 2015). Also , the band at 3447 cm -1 in the spectrum of NaM, was shifted on lower wavenumbers (3433 cm -1 ) in the spectrum of HDTMA-montmorillonite, while the intensity of the ...

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... assigned to asymmetric and symmetric stretching vibrations of CH2 group respectively ( Tomić et al., 2015). Also , the band at 3447 cm -1 in the spectrum of NaM, was shifted on lower wavenumbers (3433 cm -1 ) in the spectrum of HDTMA-montmorillonite, while the intensity of the band became significantly lower with the increment of HDTMA + loading (Fig. 1c). Interaction of HDTMA + with NaM caused the decrease of the water content due to the replacement of hydrated Na + with HDTMA + . Absorption bands around 1473 cm -1 in the spectrum of the HDTMA bromide are attributed to CH2 scissoring vibrational mode (Fig. 1d). The nature of the montmorillonite surface was changed from hydrophilic to ...

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... intensity of the band became significantly lower with the increment of HDTMA + loading (Fig. 1c). Interaction of HDTMA + with NaM caused the decrease of the water content due to the replacement of hydrated Na + with HDTMA + . Absorption bands around 1473 cm -1 in the spectrum of the HDTMA bromide are attributed to CH2 scissoring vibrational mode (Fig. 1d). The nature of the montmorillonite surface was changed from hydrophilic to hydrophobic. Stretching vibration bands of phenyl ring appear between 1400 and 1600 cm -1 in the spectrum of PTMA, namely, at 1594, 1500, 1474, 1461, and 1416 cm -1 (Fig. 1f). The band at 1300 cm -1 was assigned to the vibrations of the ammonium group. Heights ...

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... 1473 cm -1 in the spectrum of the HDTMA bromide are attributed to CH2 scissoring vibrational mode (Fig. 1d). The nature of the montmorillonite surface was changed from hydrophilic to hydrophobic. Stretching vibration bands of phenyl ring appear between 1400 and 1600 cm -1 in the spectrum of PTMA, namely, at 1594, 1500, 1474, 1461, and 1416 cm -1 (Fig. 1f). The band at 1300 cm -1 was assigned to the vibrations of the ammonium group. Heights of these bands decreased after the interaction between PTMA + cations and montmorillonite (Fig. 1e). The band at 1594 cm -1 disappeared, probably as a result of the interaction between π electrons of the phenyl ring and π electrons of the oxygen in ...

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... Stretching vibration bands of phenyl ring appear between 1400 and 1600 cm -1 in the spectrum of PTMA, namely, at 1594, 1500, 1474, 1461, and 1416 cm -1 (Fig. 1f). The band at 1300 cm -1 was assigned to the vibrations of the ammonium group. Heights of these bands decreased after the interaction between PTMA + cations and montmorillonite (Fig. 1e). The band at 1594 cm -1 disappeared, probably as a result of the interaction between π electrons of the phenyl ring and π electrons of the oxygen in the tetrahedral layer of the montmorillonite ( Majdan et al., 2009). Also, the band at 1300 cm -1 disappeared, which is due to a strong interaction between positively charged nitrogen and ...