Crystalline polysilicate magadiite with intercalated n-alkylmonoamine and some correlations involving thermochemical data

Effect of thermal dehydration and rehydration on Na-magadiite structure

“…This material exhibits a broad range of properties, such as sorption of interlamellar water and polar organic molecules, cation exchange of interlayer sodium cations, intracrystalline swelling, grafting, and transformation into crystalline layered silicic acids by proton exchange [14,15]. Thus, these properties promote the application of Na-magadiite as adsorbents [16], catalysts [17], cation exchangers, or molecular sieves [18]. The interlayer spacing of Na-magadiite, d 001 , changes with water content and exchange sodium ions.…”

Thermodynamics of the nickel and cobalt removal from aqueous solution by layered crystalline organofunctionalized barium phosphate

“…The same adsorption procedure with the original lamellar compound showed that no cation was adsorbed. On the contrary, as exemplified for the isotherm of nickel on BaPSiL 1 , the adsorption results were adjusted to the Langmuir model [21], in a C s versus n f plot gives the slope and its linearized form, C s /n f versus C s plot, provided the intercept, as shown in figure 4. In all cases, the organofunctionalized species on the solid surface, containing one to three basic nitrogen atoms attached to the pendant chains, coordinate the divalent cations (M), which diffuse from the solution phase to the expanded layered cavity.…”

“…Thus, a sequence of values was obtained from the calorimetric results to enable the calculation of the net enthalpy of interaction to form a monolayer per unit mass of matrices, Dh int , by using equation (6), a modified Langmuir model adjusted to describe several types of systems [20,21] …”

Structural incorporation of titanium and/or aluminum in layered silicate magadiite through direct syntheses

“…After 60 h of hydrothermal reaction, as represented in Fig. 1c, the magadiite started to form, indicated by the presence of all characteristic structural peaks [29]. With thermal treatment the crystallinity increased, presenting the layered silicate form after 72 h.…”