Performance of phosphoric acid activated montmorillonite as buffer materials for radioactive waste repository

Study of structural properties of acid-treated natural sediment and its application as a sustainable catalyst

“…However, this behavior is reversed for a 4 M concentration. These observations are consistent with reported data (González et al 1981;Pushpaletha et al 2005;Wang et al 2010).…”

“…Concerning the surface area of the samples, the initial increase is attributed to the leaching and exchange of metal cations for protons present in the illite/montmorillonite interlamellar space. At high H 2 SO 4 concentrations (4 M), a decrease in the BET area is observed, which is associated with the leaching of Al 3+ and Mg 2+ cations from the octahedral sites of the clay mineral crystalline network, thus generating silica because of the partial collapse of the crystalline structure (González et al 1981;Pushpaletha et al 2005;Wang et al 2010).…”

Montmorillonite- hydrothermal carbon nanocomposites: Synthesis, characterization and evaluation of pesticides retention for potential treatment of agricultural wastewater

“…On the other hand, when the hydrothermal treatment at 210 ºC was carried out in the presence of phosphoric acid, an increase in the BET surface area was observed: Mac1 and Mac2 samples had 82 and 81 m 2 g -1 , respectively, as was also reported for an Australian sodium bentonite obtained by acid treatment (Toor and Jin, 2012). This increase in the surface area after activation of M with acids was assigned to the removal of metal-exchange cation (Mg 2+ , Fe 3+ and Al 3+ ) and proton exchange (Nguetnkam et al, 2005;Wang et al, 2010). In addition, for the Mac1 sample the structure was preserved despite the acid treatment, but not for the Mac2 sample where mainly the leaching of octahedral ions Al 3+ modifies the M structure, as will be explained later.…”

Clay Materials for Environmental Remediation

“…The utilization of clay minerals as the adsorbents for the antibiotics removal has been conducted by a large number of researchers, mostly using the synthetic aqueous solution as the model for aquatic environments (Chang et al 2009a, b;Wu et al 2010;Li et al 2010aLi et al , b, 2011Molu and Yurdakoc 2010;Wang et al 2010Liu et al 2012;Lu et al 2012;Parolo et al 2012;Yan et al 2012;Zhao et al 2012;Lv et al 2013;Wu et al 2013a, b;Zhang et al 2013;Sturini et al 2015). Currently, as a consequence of their overuse, bacteria have developed antibiotic resistance as opposed to the oldest compounds.…”