The adsorption behaviors of Hg2+ ions on adsorbents, salicylaldehyde modified amino-terminated polymers (denoted as SiO2-APTS-SA, SiO2-EDA-SA, SiO2-DETA-SA, SiO2-TETA-SA and SiO2-TEPA-SA, respectively), were studied. The prepared five resins were characterized by Fourier transform-infrared spectra (FTIR), elemental analysis and nitrogen adsorption–desorption. The maximum adsorption capacity of SiO2-APTS-SA, SiO2-EDA-SA, SiO2-DETA-SA, SiO2-TETA-SA and SiO2-TEPA-SA for Hg2+ ions reached 0.2416, 0.2603, 0.2655, 0.2769 and 0.2915 mmol g-1, respectively.