Synthesis of new functionalized magnetic nano adsorbents and adsorption performance for Hg(II) ions

Fe₃O₄@SiO₂-NH-nNG-SPTZ (including Fe₃O₄@SiO₂-NH-2NG-SPTZ, Fe₃O₄@SiO₂-NH-3NG-SPTZ) were prepared by 2-mercapto-5-(4-pyridyl)-1,3,4-thiadiazole and the reaction products of 3, 6-dichloropyridazine and cyanuric chloride with Fe₃O₄@SiO₂-NH₂ respectively. Fe₃O₄@SiO₂-S-nNG-SPTZ (including Fe₃O₄@SiO₂-S-2NG-SPTZ, Fe₃O₄@SiO₂-S-3NG-SPTZ) were prepared by 2-mercapto-5-(4-pyridyl)-1,3,4-thiadiazole and the reaction products of 3, 6-dichloropyridazine and cyanuric chloride with Fe₃O₄@SiO₂-SH respectively. Four novel adsorbents were characterized by SEM, TEM, FT-IR and XRD. Hg(II) ions removal efficiency of these adsorbents were more than 95%, in 15-20 min, at pH 7.0-8.0. It is easy to separate these adsorbents that adsorb mercury ions from the solution through magnets. These adsorbents have similar adsorption mechanism and have application value in the treatment of mercury ions in sewage and are worth studying.