Adsorption properties ofmagnetic chitosan hydrogelmicrospheres to Pb(II) from aqueous solutions
PU Sheng-yan1,2,3, WANG Ke-xin1,2, MA Hui1,2, YANG Zeng1,2, HOU Ya-qi1,2, CHEN Hong-yu1,2
1. State Key Laboratory of Geological Prevention and Geological Environment Protection, Chengdu University of Technology, Chengdu 610059, China;
2. State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, Chengdu University of Technology, Chengdu 610059, China;
3. Department of Civil and Environment Engineering, The Hong Kong Polytechnic University, Hong Kong, China
In this study, the magnetic porous chitosan hydrogel microsphere was fabricated by a combination of in situ-coprecipitation and sodium citrate crosslinking technique using chitosan as raw material. The scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TG) were conducted for the characterization of this novel adsorbent. The hydrogel microsphere present a well developed porous inner structure and the Fe3O4nanoparticles with an average diameter of (4.79±1.09) nm dispersed uniformly. The functional group of chitosan, the hydroxyl, amino and carboxyl groups, remained after the introduction of the Fe3O4, and the magnetic adsorbent could be separated by the addition of external magnetic field. The adsorption isotherm and kinetic study for the Pb (Ⅱ) removal from the aquatic environment indicating that the adsorption process was dominated by the chemical adsorption and the maximum adsorption capacity was calculated as 178.25mg/g.
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