Polymer-Inorganic Composites Containing Immobilized Poly[8-hydroxyquinoline-formaldehyde-resorcinol] and Their Sorption Properties Against Cu(II), Cd(II), Pb(II), and Fe(III) Ions

Polymer-inorganic composites were synthesized via in situ polycondensation of 8-hydroxyquinoline, resorcinol, and formaldehyde on clinoptilolite, as well as through physical adsorption of the resulting copolymer on bentonite, clinoptilolite, saponite, and silica gel. IR spectroscopy confirmed the surface immobilization of the polymer phase, while thermogravimetric analysis revealed thermal degradation of the polymer between 200–590 °C, allowing determination of its mass fraction in the composite materials.

Changes in specific surface properties and morphology following immobilization were characterized using low-temperature N₂ adsorption-desorption isotherms and scanning electron microscopy. Sorption evaluation against Fe(III), Cu(II), Pb(II), and Cd(II) ions demonstrated that composites based on clinoptilolite and saponite achieved enhanced adsorption capacities for all target metal ions compared to the untreated parent minerals.