Al13-pillared montmorillonite modified by cationic and zwitterionic surfactants: A comparative study

Thermal analysis evidence for the location of zwitterionic surfactant on clay minerals

“…In particular, surfactant-modified montmorillonites ('organoclay') have received a great deal of attention because of their great performance in environmental protection, remediation Theng et al, 2008) and the synthesis of clay polymer nanocomposites (Ray and Okamoto, 2003;Theng, 2012). A recent development of great interest is the preparation of surfactantmodified pillared interlayered clays (PILC) (Tahani et al, 1999;Annabi-Bergaya, 2008;Zhu et al, 2009a;He et al, 2014;Ma et al, 2014aMa et al, , 2014b. Having both hydrophilic and hydrophobic surface properties, these inorganic-organic clays (IOC) are potentially capable of synchronically removing organic and inorganic contaminants in wastewater (Zhu and Zhu, 2007;Bouberka et al, 2009;Zhu et al, 2009b;Ouellet-Plamondon et al, 2012).…”

Adsorption of phenol, phosphate and Cd(II) by inorganic–organic montmorillonites: A comparative study of single and multiple solute

“…indicating that partial replacement of Al 13 cations in the interlayer space of AlPMt by C16 cations [19]. In the case of Z-AlPMt, the Al/Si ratio of Z-AlPMt was closely similar to that of the parent AlPMt ( Table 1), suggesting that the modification of Z16 had little, if any, effect on the Al content of Z-AlPMts.…”

“…Thus, the adsorption capacity of AlPMt strongly depended on the amount of loaded Al 13 cations. Moreover, the exchangeable counter anions (Br − ) on C-AlPMt also could contribute to the adsorption of oxyanions [31,32], since cationic surfactant could intercalate in AlPMt as molecules (ion pairs) via van de Waals force between alkyl chains [18,19]. Adsorption isotherms of phosphate on IOMts were compared in Fig.…”

“…As a result, the maximum loading of Z16 was less than that of C16 on AlPMt. Z16 might occupy the pore space between the interlayer Al 13 pillars [19,28], and/or the external surface of AlPMt.Because of the evident difference in the structure of IOMts with different surfactants, their adsorption capacities towards the three contaminants could be quite different.…”

“…Hydroxyl-metal pillared montmorillonites, on the other hand, exhibits a strong affinity for heavy metals and phosphate [11][12][13][14][15][16]. Inorganic-organic montmorillonite (IOMts), intercalated by both surfactant and hydroxyl-metal, have been developed to remove both organic and inorganic contaminants [17][18][19]. The adsorption capacities of IOMts toward organic contaminants and phosphate or organic contaminants and heavy metal cations have received a lot of attention [20][21][22][23].…”