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

In this study, a functionalized magnetic powder complex porous carbon derived from ZIF-8 (ZIF-8@Na-Cit@Fe3O4NPs@AC(500 degrees C)) was prepared and applied for the waste liquid containing MB, TC, and Cu2+ adsorption removal. The ZIF-8@Na-Cit@Fe3O4NPs@AC(500 degrees 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 degrees 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 (Delta G) and enthalpy (Delta H). The difference of MB, TC, and Cu2+ adsorption on ZIF-8@Na-Cit@Fe3O4NPs@AC(500 degrees C) attributed to the affinity difference (polarity and molecular diameter) and the nitrogen-containing functional groups (pi-pi interaction and electrostatic attraction). Therefore, it was found that ZIF-8@Na-Cit@Fe3O4NPs@AC(500 degrees C) could effectively adsorb MB, TC, and Cu2+, and ZIF-8@Na-Cit@Fe3O4NPs@AC(500 degrees C) could remove more than 70% of the above pollutants after repeated use for four times; it has a good application prospect. Porous organic composite modified with sodium citrate (ZIF-8@Na-Cit@Fe3O4NPs@AC(500 degrees C)) was successfully synthesized via ultrasonic-assisted in situ precipitation and calcination in a tubular furnace and applied to adsorption experiments of wastewater containing MB, TC, and Cu2+. It was found that ZIF-8@Na-Cit@Fe3O4NPs@AC(500 degrees C) could effectively adsorb MB, TC, and Cu2+, and ZIF-8@Na-Cit@Fe3O4NPs@AC(500 degrees C) could remove more than 70% of the above pollutants after repeated use for four times; it has a good application prospect.image