Since bentonite has a very good sorption capability for many radionuclides, the displacement of the clay might lead to a "clay-mediated" contaminant transport into the rock.
The FEBEX bentonite has a high cation exchange capacity (∼1 eq/kg), high surface area (∼725 m2/g total surface area and 62 m2/g external surface area) and accessory minerals such as carbonates, sulphates, pyrite, etc.; and organic matter.
Figure 3 shows that 0.1 M MgCl2 had a similar impact on TMV CP removal at all bentonite concentrations tested, with bentonite having a minimal impact on TMV levels in the absence of MgCl2.
A colloidal clay marketed under the trade name 'Bentonite' has a flocculating effect from its sodium salt content, and also disperses to fine particles which have a sealing effect.
Hence, Ca-bentonite has a greater proportion of relatively large pores; this was confirmed by Hg intrusion porosimetry.
The industrial and environmental applications of bentonite have showed an upsurge of interest in recent years; various abundant minerals and clay minerals have been utilized in manufacturing process of cement, and they included: kaolinite, goethite, dolomite, cristobalite, and palykorskite (Bojumueller et al. 2001; Taylor-Lange et al. 2012).
The adsorption and ultrasonic desorption of toxic heavy metal cations (i.e., Cd II) and Zn II)) on natural bentonite have been modeled with the aid of a factorial design approach.
Inside the cells, six blocks of FEBEX bentonite have been piled-up, giving rise to a total length similar to the thickness of the clay barrier in a repository according to the Spanish concept.
The cement pastes containing palygorskite and bentonite have, in comparison to the pure cement paste and the paste containing kaolinite, a more open pore structure consisting of fine pores.
