SBA-15 nanoporous silicas functionalized with amine-, thiol-, vinyl-, phenyl-and cyano surface groups were synthesized by using the amphiphilic block copolymer P123 as the structure-directing agent. The obtained materials have awell-developed porous structure - the values of specific surface area are in the range 800-950 m(2)/g and the sizes of cylindrical mesopores are in the range 7.4-8.6 nm. It was established that the size of the mesopores strongly depends even on small amounts of co-monomers co-condensing with TEOS. Adsorption of Zn(II) ions at the SBA-15/NaCl interface was investigated by means of the radioactive isotope tracer technique over the pH range of 3-11. Surface charge density, adsorption density, pH(50%) and Delta pH(10-90%) parameters for different concentrations of the carrying electrolyte were evaluated and discussed. (C) 2009 Elsevier B.V. All rights reserved.