Preparation of Cochineal Hyperbranched Magnetic Adsorbent with High Adsorption Performance and Its Application in Environmental Water

The cochineal hyperbranched polyglycidyl ether magnetic adsorbents (Fe3O4-HPG) were synthesized for adsorption of cochineal with glycidyl ether as functional monomer, cochineal as target, and Fe3O4 as carrier by a simple and ingenious synthesis method for the first time. The physical and chemical properties of the materials were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and vibrating sample magnetometer (VSM). These results showed that Fe3O4-HPG had uniform particle size, good magnetism, and stable crystal structure. At the same time, the kinetic adsorption, thermodynamic adsorption, and reusability of Fe3O4-HPG were investigated. The prepared materials had high adsorption capacity (106.06 mg/g), fast adsorption rate (60 min) and good reusability (Adsorption efficiency of 95.8% after reusing for 8 times). Moreover, combined with high performance liquid chromatography, the Fe3O4-HPG as adsorbents have been successfully used to specifically recognize and detect cochineal in environmental water with recoveries over 94.6%.