Kinetics of adsorption of disperse dyes by polyepicholorohydrin-dimethylamine cationic polymer/bentonite

Selective sorption of rubidium by potassium cobalt hexacyanoferrate

“…6] and the reduced rate of intraparticle diffusion resulting from the low Rb concentration in solution [27]. As the entire plot was not linear and did not pass through the origin, film diffusion, intra-particle diffusion, and exchange with structural K appeared to have occurred simultaneously during the sorption process.…”

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

“…Cationic polymers contain large amounts of cation charge, and they have also been used for modifying montmorillonite to obtain novel polymer-montmorillonite complexes Li et al, 2007;Yue et al, 2007a;Yue et al, 2007b). Although the polymermontmorillonite complexes can efficiently remove dyes from water (primarily via an ionic exchange process) Yue et al, 2007a;Yue et al, 2007b), they have not been widely used for the sorption of HOCs.…”

“…Although the polymermontmorillonite complexes can efficiently remove dyes from water (primarily via an ionic exchange process) Yue et al, 2007a;Yue et al, 2007b), they have not been widely used for the sorption of HOCs. This might be because the cationic polymers are always more hydrophilic than cationic surfactants and could not provide as many effective sorption sites as the cationic surfactants for the HOCs.…”

Adsorption of polyhydroxy fullerene on polyethylenimine-modified montmorillonite

“…A number of studies indicated that Mt could be easily modified by cationic modifiers to synthesize various adsorbents, such as the cationic surfactant modified Mt for organic contaminants (Roberts et al, 2006;Zhu et al, 2011), and the hydroxymetal polycations modified Mt for oxyanions (Zhou et al, 2010;Ma et al, 2015). As an important type of modifiers for Mt, the cationic polymers have received broad attentions because of their large charge/mass ratio (Yue et al, 2007;Zhu et al, 2010). In this regard, cationic polymers could readily saturate the CEC of Mt and change the surface charge of Mt from negative into positive.…”