Immobilization mechanism of As, Mn, Pb and Zn ions in sulfide tailings by the addition of triethylenetetramine-montmorillonite nanocomposite

A practical approach for enhanced biodiesel production using organic modified montmorillonites as efficient heterogeneous hybrid catalysts

“…Characteristic peaks at 3621 and 1631 cm −1 were assigned to tensile and flexural vibrations, respectively, of the O–H adsorbed water. 23 The broad bands of the hydroxyl bending vibration of the modified composite material bonded with Al 3+ cations at 3621 cm −1 were significantly reduced, indicating a decrease in adsorbed water content. 24 Peaks at 1448 and 1301 cm −1 resulted from the plane tensile vibration mode of C–N and plane deformation of C–N, 25 respectively, which were the characteristic peaks of polypyrrole.…”

“…cm −1 were assigned to tensile and flexural vibrations, respectively, of the O-H adsorbed water 23. The broad bands of the hydroxyl bending vibration of the modified composite material bonded with Al 3+ cations at 3621 cm −1 were significantly reduced, indicating a decrease in adsorbed water content 24.…”

Comparison of Salvianolic Acid A Adsorption by Phenylboronic-Acid-Functionalized Montmorillonites with Different Intercalators

“…Due to its inherent chemical stability, significant specific surface area, and affordable price, montmorillonite (MMT), a type of clay mineral with three-lamellar structures made up of a Si-O tetrahedron and an Al-O octahedron, plays a significant role in the field of adsorption [ 13 , 14 , 15 ]. However, in practice, natural MMT exhibits some drawbacks, including poor selectivity, a slow mass transfer rate, and a small amount of adsorption capacity [ 16 , 17 , 18 ], which are attributed to the absence of functional groups, narrow interlayer spaces, and a dearth of efficient adsorption sites.…”