Organo-Clay Complexes and Interactions

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

“…The patterns of dry and wet montmorillonite are also shown for comparison. Water molecules can evidently expand the basal spacing of montmorillonite, and the value of 1.86 nm corresponds to an interlayer structure with three water pseudo-layers [37,38]. 0.2 CEC times of CTMA intercalation can further slightly expand the basal spacing (to 1.92 nm), and it is retained at the beginning of the aging process.…”

“…Therefore, the interlayers with 1.90 nm reflection should contain both Ca 2+ and CTMA. Since alkyl chains of CTMA are highly hydrophobic, the alkyl chains would prefer lying on the siloxane surface, which also has been widely considered as hydrophobic [37,42]. At low CTMA loading level (e.g., below 0.4 CEC), plenty of siloxane surfaces are available for alkyl chains to lay flat on them.…”

Novel polymer/surfactant modified montmorillonite hybrids and the implications for the treatment of hydrophobic organic compounds in wastewaters

“…These materials are considered as appropriate landfill liners (Lo, 2001;Smith et al, 2003;Yariv and Cross, 2002), potential sorbents in removing organic pollutants from water (Anirudhan and Ramachandran, 2007;Lin and Juang, 2009;Marsal et al, 2009;Wang et al, 2004), and effective barriers for organic compound contaminated sites to prevent further pollution of the surrounding environments (Boyd et al, 1988a;Zhu and Chen, 2009;Zhu et al, 2003). The efficiency and costs of the organo montmorillonites in pollution control strongly depend on their sorption capacity towards the HOCs; thus the methods for improving their sorption capacities are of great importance.…”

Influence of Basic Red 1 dye adsorption on thermal stability of Na-clinoptilolite and Na-bentonite

“…5b-c. The DTG curves can be divided into three parts [19,44,45]: (1) a low-temperature region (\170°C) where the clay loses adsorbed and interlayer water, (2) a central region (170-500°C) with an exothermic peak at 396°C assigned to the decomposition of the dye ), where dehydroxylation of bentonite and pyrolysis of charcoal are observed. The BR1 adsorption on the bentonite surface leads to changes in the weight loss and a significant shift of decomposition temperature.…”

“…There are several types of reactions of dyes with clays [19] such as colored p-and d-complexes formation and ion-exchange, acid-base and oxidation-reduction reactions. The aim of this article is to show the effects of adsorption of rhodamine 6G as a representative dye on the physicochemical properties of aluminosilicates (clinoptilolite, bentonite) that are of importance from both theoretical and practical points of view.…”