Preparation of ZIF‐8‐Based Functionalized Magnetic Nanocomposites and Their Application in Aqueous Environment

Abstract

ABSTRACTIn this study, a functionalized magnetic powder complex porous carbon derived from ZIF‐8 (ZIF‐8@Na‐Cit@Fe3O4NPs@AC(500°C)) was prepared and applied for the waste liquid containing MB, TC, and Cu2+ adsorption removal. The ZIF‐8@Na‐Cit@Fe3O4NPs@AC(500°C) perfectly inherited the feature of parent ZIF‐8, posed a high specific surface area (SBET = 812.73 m2 g−1), be rich in surface nitrogen functional groups, and resulting in a good dynamic adsorption of the MB, TC, and Cu2+. The ZIF‐8@Na‐Cit@Fe3O4NPs@AC(500°C) exhibited the best adsorption performance of high‐concentration waste liquid containing MB, TC, and Cu2+, with equilibrium adsorption capacity of MB (408 mg g−1), TC (417 mg g−1), and Cu2+ (386 mg g−1), respectively. The acetone and toluene adsorption were spontaneously and exothermic, given the negative values of free energy (ΔG) and enthalpy (ΔH). The difference of MB, TC, and Cu2+ adsorption on ZIF‐8@Na‐Cit@Fe3O4NPs@AC(500°C) attributed to the affinity difference (polarity and molecular diameter) and the nitrogen‐containing functional groups (π‐π interaction and electrostatic attraction). Therefore, it was found that ZIF‐8@Na‐Cit@Fe3O4NPs@AC(500°C) could effectively adsorb MB, TC, and Cu2+, and ZIF‐8@Na‐Cit@Fe3O4NPs@AC(500°C) could remove more than 70% of the above pollutants after repeated use for four times; it has a good application prospect.