Facile Synthesis of ZIF-8/ZnO/Polyoxometalate Ternary Composite Materials for Efficient and Rapid Removal of Cationic Organic Dye

In this paper, we develop a facile and convenient two-step strategy for preparation of ZIF-8/ZnO/K6P2W18O62 (P2W18) ternary composite materials for the first time. ZIF-8/ZnO are fabricated by a “direct mixing” synthesis strategy and served as the substrate for subsequent P2W18 deposition. Then, ZIF-8/ZnO/P2W18 ternary composite was prepared in P2W18 aqueous solution through electrostatic interaction process. Further, the composites with different loading of P2W18 were achieved by reacting with different concentration of P2W18 aqueous solution. The as-prepared composite materials were characterized and confirmed by powder X-ray diffraction, TEM, EDS, ICP, FT-IR spectra, UV–Vis diffuse reflectance spectroscopy, and electrochemical test. It is noteworthy that the hybrid composites exhibit high efficient activities in the removal of cationic dyes, which could be ascribed to the high adsorption capacity derived from the strong electrostatic interaction between P2W18 and cationic dyes. Based on the investigation, the composites have potential application for waste water purification.