Retention of radionuclides by organophilic bentonite

The Geochemistry of Technetium: A Summary of the Behavior of an Artificial Element in the Natural Environment

“…For example, in the marine environment, seawater containing high concentrations of organic matter (typically at depths well below the oxygen-rich surface waters) yields high partition coefficients (K D up to 1500 mL/g) (Brown et al 1999). In terrestrial environments, a number of investigators have reported retention of technetium in soils containing relatively high amounts of organic matter (Bors et al 1999;Geraedts et al 2002;Wolfrumm and Bunzl 1986). In addition, soil scientists have noted that the bioavailability of technetium in plants diminishes with time (Cataldo et al 1989;Echevarria et al 1997), and some investigators have speculated that binding between organic matter and technetium may be one reason for the diminishing uptake of technetium into plants with time ).…”

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

“…More poorly hydrated head groups require lower free energy to displace the hydration shell and bind to the target anions with lower hydration energy (Wolff, 1998;Xiong et al, 2007). In the present work, the influence of the surfactant structure to modify Mt on the removal of perchlorate by modified Mt was examined, because of the potential harmfulness, high solubility and persistence of ClO (Haggety and Bowman, 1994;Bors et al, 1999;Behnsen and Riebe, 2008;Xi et al, 2010) and using the obtained organoclays to remove different inorganic anions (Atia, 2008). Although several research groups comparatively studied the influence of surfactant structure (number and length of alkyl chain) on surfactant configuration and distribution in organoclays (Xi et al, 2007;Zhu et al, 2012), the further application and significant discussion in inorganic anion adsorption were not addressed.…”

Characterization of Sr2+uptake on natural minerals of kaolinite and magnesite using XRPD, SEM/EDS, XPS, and DRIFT

“…Various studies have been carried out to examine different aspects of the sorption behavior of Sr on a variety of solid materials [2][3][4][5][6][7][8][9][10][11][12][13]. Whereas the sorption behavior of Sr 2+ on kaolinite was investigated in a limited number of studies [14][15][16][17], our literature survey did not yield information *Author for correspondence (E-mail: talalshahwan@iyte.edu.tr).…”