Expansion characteristics of organo montmorillonites during the intercalation, aging, drying and rehydration processes: Effect of surfactant/CEC ratio

Montmorillonite as a multifunctional adsorbent can simultaneously remove crystal violet, cetyltrimethylammonium, and 2-naphthol from water

“…According to previous studies (He et al, 2006;Xi et al, 2005), CTMA should first adopt lateral-monolayer arrangement and then lateral-bilayer arrangement within the interlayer space of dry CA-Mt, as its loading level increased from 0.2 CEC to 0.6 CEC. Water saturated CA-Mt has larger basal spacing than the corresponding dry CA-Mt and the wet Mt, consistent with previous studies (Zhu et al, 2011), indicating the incorporation of large amount of water molecules to the interlayer space of the wet samples.…”

Effect of surfactant molecular structure on perchlorate removal by various organo-montmorillonites

“…The large surfactant loading (Table 2) and dense packing of alkyl chains (Fig. 4) of C18-BM/Mt and 2C18-DM/Mt suggested a poor swelling property derived from the rehydration process (Zhu et al, 2011), which may be responsible for the second adsorption stage. The ion exchange sites on the external surface are more readily accessible than those inside of the adsorbents which became accessible through slow swelling process.…”

Investigation of the Orientation of CTA+ Ions in the Interlayer of CTAB Pillared Montmorillonite

“…e structural characteristics, such as basal spacing, surface area, porous structure, and arrangement models of organic cations, have been reported in numerous publications [7][8][9][10][11][12][13][14][15][16]. Based on the obtained structural information, the potential correlation between microstructure and adsorption characteristics of organoclays has been proposed in several reports [1,[17][18][19][20][21][22][23][24]. Chen et al [5] indicated that as the arrangement model of organic cations evolves from �at-monolayer to �at-bilayer, to pseudotrilayer, then to paraffin-monolayer and �nally to paraffinbilayer with the increase of their loading amounts, the alkyl chains will �rst form strong adsorbed organic �lm and then gradually transfer to weak partition organic phase.…”