SBA-ionic liquid as an efficient adsorbent of palladium, silver, and gold ions

Syntesis of amine and thiol silica modified: used of removal Ag(I) of aqueous system

“…In recent years, magnetic hybrid nanomaterials have been studied as adsorbents in the recovery of metal ions, these have been proposed as an alternative in hydrometallurgy for the recovery of precious metals mainly (Pd, Pt, Rh, Ag and Au) and rare earths from e-waste recovery processes [1][2][3][4][5][6][7][8][9][10]. These proposals involve the use of a magnetic nanostructured material such as Fe3O4, -Fe2O3, CoFe2O4, MnFe2O4 among others; these materials are usually coated with a film of a surfactant, polymer or silica as a protective film that favours the modification of the magnet surface with various functional groups that provide selectivity to the metal ion of interest [1].…”

“…These proposals involve the use of a magnetic nanostructured material such as Fe3O4, -Fe2O3, CoFe2O4, MnFe2O4 among others; these materials are usually coated with a film of a surfactant, polymer or silica as a protective film that favours the modification of the magnet surface with various functional groups that provide selectivity to the metal ion of interest [1]. The principle of these materials is the adsorption of the metal ion with the functionalising group, which can be done by physical adsorption or covalent immobilisation [1][2][3][4][5][6][7][8][9][10].…”

“…One of the advantages of silica coatings is the ease of anchoring a wide range of functional groups through the condensation of various alkylarylsilanes. [1][2][3][4][5][6][7][8][9][10]. Recently, the use of mesoporous silica (MS) type SBA-15, modified with magnetite and chelating groups N, N, O donors for the recovery of Cd(II), Ni(II), Pb(II) and Zn(II) traces in aqueous solutions has been proposed [6][7][8][9][10][11][12][13].…”

“…[1][2][3][4][5][6][7][8][9][10]. Recently, the use of mesoporous silica (MS) type SBA-15, modified with magnetite and chelating groups N, N, O donors for the recovery of Cd(II), Ni(II), Pb(II) and Zn(II) traces in aqueous solutions has been proposed [6][7][8][9][10][11][12][13]. Recently, the use of magnetic composites with metal lattices, polymers and mesoporous silica matrices, activated carbon and other ceramics has been reported for the removal of various contaminants in aqueous media and soil, such as U(VI), Cd, Ni, Pb and various organic contaminants such as oils and dyes [14 -19].…”

Effect of silicic acid concentration on green mesoporous silica synthesis

“…Mesoporous and functionalized mesoporous silica material has been an important application and interest in the material science, for example, has been widely used in the removal of contaminants (ion metallic and no metallic, dyes and different organic compound), as support catalytic, optic application, and diverse biologic application (control release drug system, support of biomolecule) [1][2][3][4][5][6]. Usually, the TEOS (tetraethoxysilane) is used as a precursor of silica matrix in the synthesis of these materials, this precursor has the disadvantage of being very expensive, so the use of other silica precursors is more economic as the sodium metasilicate (Na2SiO3) has been proposed in these materials syntheses [7][8][9][10][11][12][13].…”