Adsorption of Methyl Red Dye onto a Novel Fe3O4/ZnO/C Composite Derived from ZIF-8
摘要
In this study, the synthesis of a novel magnetic Fe3O4/ZnO composite embedded in porous carbon matrix, namely Fe3O4/ZnO/C was conducted. Fe3O4/ZnO/C (FZC) was synthesized by a simple method by the calcination of mixed FeCl2 and ZIF-8 at 600 °C under N2 flow. It was found that ZFC had a porous structure owning a reasonable surface area of 184 m2 g−1. The adsorption performance of the material was demonstrated through the elimination of methyl red (MR) in water. The MR adsorption process was investigated under various conditions, reaching the highest removal efficiency to 95% within 180 min at pH 7, an initial MR solution concentration of 10 mg L−1, and an adsorbent dosage of 0.2 g L−1. Furthermore, the Elovich kinetic model and the Bangham isotherm models were found suitable for describing the MR adsorption on this material. The Qmax value was 88.8 mg CR per gram of FZC adsorbent. The proposed adsorption mechanisms were π–π interaction, n–π interaction, electrostatic interaction and hydrogen bonding. With three cycles of reuse and maintaining good stability, and adsorption capacity, FZC may be highly appropriate for a promising application in practical dye treatment systems.