Preparation of Micro-sized Sulfonated Polystyrene Microspheres and Rapid Adsorption of Pb2+
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Abstract:
Micron-sized polystyrene (PS) microspheres were prepared via dispersion polymerization using styrene as the monomer. Micron-sized sulfonated polystyrene (SPS) microspheres were produced via modification with concentrated sulfuric acid before being applied to adsorb heavy metal Pb2+. The structural characterization of PS and SPS microspheres were performed by SEM, FIRT, TG, XRD, XPS and elemental analysis. In the meantime, the effect of the ratio of PS microspheres to concentrated sulfuric acid (g : mL), and the sulfonation degree of microspheres as a function of sulfonation time, were also studied. Moreover, the effects of adsorption time, solution pH and initial substrate concentration on the adsorption of Pb2+ on SPS microspheres were investigated, along with the adsorption stability and desorption properties of SPS microspheres. The results showed that the prepared PS microspheres had uniform particle size and an average particle size of 1.2 μm. The sulfonation modification performed at 40 ℃ for 48 h and a solid-to-liquid ratio of 1:40 (g : mL yielded SPS microspheres with good water solubility, monodispersity and uniform particle size, along with an average particle size of 1.4 μm and degree of sulfonation of 0.560±0.01 mmol/g. The adsorption and desorption equilibrium times for Pb2+-SPS microspheres were 5 min and 1 min, respectively, with a desorption rate of 99.81% and unchanged adsorption performance after four cycles.
