Intercalation of both CTMAB and Al13 into montmorillonite

Zhu, Runliang; Wang, Tong; Ge, Fei; Chen, Wangxiang; You, Zhixiong

doi:10.1016/j.jcis.2009.03.033

Cited by 49 publications

(39 citation statements)

References 44 publications

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“…Figure 5(a) shows that the ν as (CH 2 ) feature for the CTAB molecule is lower than 2917 cm −1 and the ν sym (CH 2 ) frequency is lower than 2849 cm −1 , meaning that it is a crystalline phase, which distinguishes from a micelle conformation [46,47]. Figures 6(c) [45,[49][50][51][52]. It is important to mention that Campbell et al [53] observed a ν as (CH 2 ) frequency lower than that found in our study, 2915 cm −1 , for a packing density of 2.1×10 14 molecules cm −2 , which is 3 times smaller than our lowest packing density.…”

Section: C-h Stretchingmentioning

confidence: 99%

Infrared Spectroscopy of Anionic, Cationic, and Zwitterionic Surfactants

Viana

Silva

Pimentel

2012

Advances in Physical Chemistry

252

167

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This paper describes the ordering degree of anionic, cationic, and zwitterionic surfactants with the increase of their packing density on Ge substrate by using Fourier transform infrared-attenuated total reflection (FTIR-ATR) spectroscopy. This work shows new insights on the conformational order of sodium dodecyl sulfate (SDS), N-hexadecyl-N-N-dimethyl-3-ammonio-1-propanesulfonate (HPS), hexadecyl-trimethylammonium bromide (CTAB), and dodecyl trimethylammonium bromide (DTAB). DFT and semiempirical calculations are also performed in order to evaluate the effect of headgroup hydration and counterion. The CH 2 asymmetric and symmetric stretching bands for the SDS molecule show a shift of 1.7 and 0.9 cm −1 to higher frequencies as the packing density increases, while it is observed a shift of 2.6 and 2.7 cm −1 for the HPS molecule, respectively. The DTAB molecule shows a shift of 4.5 cm −1 to lower frequencies for both CH 2 asymmetric and symmetric stretching bands as the packing density increases, indicating the decrease of gauche conformations and the increase of all-trans conformations over the aliphatic chain.

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Section: C-h Stretchingmentioning

confidence: 99%

Infrared Spectroscopy of Anionic, Cationic, and Zwitterionic Surfactants

Viana

Silva

Pimentel

2012

Advances in Physical Chemistry

252

167

View full text Add to dashboard Cite

show abstract

“…So to reduce wastewater treatment cost, it is desirable to develop adsorbents that can simultaneously remove both organic and inorganic contaminants. Previous studies used both metal complex cations and organic cations as intercalators to modify the montmorillonites, and obtained inorganicorganic montmorillonites (IOMts) [24,25]. The IOMts are of the adsorption sites/domains for both organic and inorganic contaminants, and used as an effective adsorbent for the both organic and inorganic pollutants from wastewater [11,[25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Investigation of structure and thermal stability of surfactant-modified Al-pillared montmorillonite

Zhou

Tian

et al. 2013

J Therm Anal Calorim

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For combining the properties of organoclays and pillared clays, inorganic-organic clays have attracted much attention in recent years. In this study, Al Keggin cation pillared montmorillonites (Al-Mts) were first prepared and parts of Al-Mts were calcined at different temperatures (C-Al-Mts). The inorganic-organic montmorillonites were synthesized by intercalating Al-Mts and C-Al-Mts with the cationic surfactant, hexadecyltrimethyl ammonium bromide (HDTMAB). The products were characterized by X-ray diffraction, X-ray fluorescence, and simultaneous thermogravimetric analysis. For HDTMAB-modified uncalcined Al Keggin cation pillared montmorillonites (H-Al-Mts), the basal spacing increased with the increment of surfactant loading level, but the Al content of H-Al-Mts decreased simultaneously, indicating that the intercalated surfactant replaced some Al Keggin cations in the interlayer space. However, in the case of C-Al-Mts, the interlayer spaces could not be further expanded after surfactant modification, implying that the neighboring montmorillonite layers were ''locked'' by the aluminum pillars which were formed by dehydroxylation of Al Keggin cation pillars during thermal treatment. The thermal stability of HDTMAB-modified C-Al-Mts (H-C-Al-Mts) was much better than that of H-AlMts. The major mass loss of H-C-Al-Mts occurred at ca. 410°C, corresponding to decomposition of intercalated surfactant cations. In contrast, H-Al-Mts displayed two mass loss temperatures at ca. 270 and 410°C, corresponding to the evaporation of surfactant molecules and the decomposition of surfactant cations in the interlayer space, respectively.

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“…The specific surface area of AlPMt (283.2 m 2 /g) was much larger than that of Ca-Mt (65.6 m 2 /g) ( Table 1), which was attributed to the expansion of montmorillonite's interlayer space by Al 13 cations [17]. After modification of surfactant, the specific surface areas of both C-AlPMts and Z-AlPMts dramatically decreased since the interlayer space were blocked by loaded surfactant ( Table 1).…”

Section: Structure Of Adsorbentsmentioning

confidence: 94%

“…Hydroxyl-metal pillared montmorillonites, on the other hand, exhibits a strong affinity for heavy metals and phosphate [11][12][13][14][15][16]. Inorganic-organic montmorillonite (IOMts), intercalated by both surfactant and hydroxyl-metal, have been developed to remove both organic and inorganic contaminants [17][18][19]. The adsorption capacities of IOMts toward organic contaminants and phosphate or organic contaminants and heavy metal cations have received a lot of attention [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Intercalation of both CTMAB and Al13 into montmorillonite

Cited by 49 publications

References 44 publications

Infrared Spectroscopy of Anionic, Cationic, and Zwitterionic Surfactants

Infrared Spectroscopy of Anionic, Cationic, and Zwitterionic Surfactants

Investigation of structure and thermal stability of surfactant-modified Al-pillared montmorillonite

Adsorption of phenol, phosphate and Cd(II) by inorganic–organic montmorillonites: A comparative study of single and multiple solute

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