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In the current study, SiO₂/Fe₃O₄ core–shell nanoparticles functionalized with TiO₂, using a simple method and application for removal of Cd(II), Hg(II) and Ni(II) ions from aqueous solution. The structure of the resulting product was confirmed by X-ray diffraction spectrometry, transmission electron microscopy (TEM), pH_pzc and Brunauer, Emmett and Teller methods. The average diameter of TiO₂/SiO₂/Fe₃O₄ nanoparticles according to TEM was obtained around 48 nm. In batch tests, the effects of pH, initial metal concentration, contact time and temperature were studied. Adsorption of metal ions was studied from both kinetics and equilibrium point of view. Maximum adsorption capacity of Cd(II), Hg(II) and Ni(II) on TiO₂/SiO₂/Fe₃O₄ nanoparticles was 670.9, 745.6 and 563.0 mg g⁻¹, respectively. Adsorption–desorption results showed that the reusability of nanoparticles was encouraging. This adsorbent was …