Amino ionic liquids-modified magnetic core/shell nanocomposite as an efficient adsorbent for dye removal

Amino ionic liquids modified superparamagnetic mesoporous core/shell nanocomposite (Fe 3 O 4 @ n SiO 2 @ m SiO 2 @DHIM-NH 2 ) was synthesized to remove orange II and amaranth from water. Due to the multiple active sites of the introduced ionic liquids, the adsorbent presents superior adsorption performance and instantaneous adsorption capacity. The maximum adsorption capacities are reached at pH 2 due to the protonation of amino groups, which are 153.06 and 84.40   mg   g −1 for orange II and amaranth, respectively. The good stability, rapid adsorption kinetics, large adsorption capacity, and high separation efficiency make Fe 3 O 4 @ n SiO 2 @ m SiO 2 @DHIM-NH 2 an efficient adsorbent for removing anionic contaminant from water.