Preparation and adsorption properties of novel Fe3O4@SA/La gel composite microspheres
FENG Yan-xia, LI Bei-gang
Inner Mongolia Key Laboratory of Environmental Chemistry, College of Chemistry and Environmental Sciences, Inner Mongolia Normal University, Hohhot 010022, China
Abstract：A novel magnetic lanthanum alginate gel composite microspheres (Fe3O4@SA/La) were prepared by aqueous solution reaction method with the addition of sodium alginate (SA), Fe3O4 and La(Ⅲ) ions. The morphology and structures of Fe3O4@SA/La were characterized by scanning electron microscope (SEM), X ray diffraction (XRD) and fourier transform infrared spectroscopy (FT-IR). The effects of pH, adsorption time and temperature on the adsorbent properties of Fe3O4@SA/La for direct red brown RN (DRB RN) and direct deep brown 2M (DDB 2M) were investigated. The results indicated that Fe3O4@SA/La shown high adsorbability to both DDB 2M and DRB RN at room temperature, when the amount of adsorbent was 0.1g, in natural pH. Adsorption equilibrium could be reached in 120min, where the adsorption capacity of Fe3O4@SA/La for DDB 2M and DRB RN could reached up 678 and 688mg/g, respectively. The adsorption process and the isothermal adsorption were in accordance with pseudo-second-order adsorption kinetic equation and the Freundlich model. The adsorption thermodynamic parameters (ΔG<0, ΔH<0, ΔS>0) indicated that the adsorption reactions of two dyes on Fe3O4@SA/La were spontaneous exothermic reactions with increased degree of confusion.
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