Abstract
Acrylamide, sodium alginate and ferroferric oxide were used as raw materials to prepare polyacrylamide/calcium alginate/ferroferric oxide magnetics composite microspheres with metal–organic double network skeleton structure. Chemical structure, thermal stability, crystallization ability, specific surface area and pore structure, surface morphology of the microspheres were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analyzer (TGA), X-ray diffractometer (XRD), specific surface area analyzer (BET) and scanning electron microscope (SEM). The effects of pH value, temperature, amount of adsorbent and triiron tetroxide on the adsorption of methylene blue (MB) were studied. At the same time, the experiments of reusability were also carried out multiple adsorption/desorption cycles on the adsorption of MB by microspheres. The maximum adsorption capacity was 71.6 mg/g. Adsorption kinetics studies show that the quasi-first-order kinetic model can be better fit the experimental data, and the Freundlich isotherm model fits a good correlation with MB adsorption. In addition, after 5 adsorption/desorption cycles, the removal rate of the adsorbent was maintained at about 94.6%, indicating that it can be reused.
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