(3-Aminopropyl)triethoxysilane-modified SiO(2 )was used for adsorption of syringic acid. Non-linear fitting anal. was employed to estimation Langmuir and Dubinin-Astakhov isotherm parameters. The adsorption capacity (Dubinin-Astakhov model) was 154,7 mg/g. The adsorbent showed substantial adsorption efficiency at the lowest initial adsorbate concn.