Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 406, Issue -, Pages 61-67Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2012.04.050
Keywords
Humic acid; Adsorption; Magnetic mesoporous microspheres; Amine functionalization
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Funding
- National Natural Science Foundation [21007048]
- Program for Young Excellent Talents in Tongji University [2009KJ074]
- State Key Joint Laboratory of Environment Simulation and Pollution Control [10K09ESPCT]
- State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRY11011, PCRRF11003]
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Fe3O4@mesoporous SiO2 core-shell composite microspheres (MS), synthesized by a typical solvothermal reaction and PEI functionalized MS (MS-PEI), have been investigated for humic acid (HA) adsorption. The structure of microspheres was characterized using scanning electron microscope, transmission electron microscope, energy dispersive X-ray, N-2 adsorption-desorption, zeta potential measurements, X-ray diffraction and vibrating sample magnetometer. The high saturation magnetization (31.9 emu/g) made them easier and faster to be separated from water under an external magnetic field. Batch adsorption tests indicated that MS-PEI exhibited high adsorption affinity to aqueous HA with a maximum adsorption capacity of 128.64 mg/g. The Freundlich model could fit the adsorption isotherm of HA on MS and MS-PEI very well, implying that adsorption processes are heterogeneous. HA adsorption on MS and MS-PEI could be well described by the pseudo-second-order kinetics. Adsorption of HA on the adsorbents was found to be strongly dependent on pH. HA loaded MS-PEI can be effectively desorbed in 0.1 M NaOH. and the regenerated microspheres can be recycled. So, it can be used as a promising adsorbent for the adsorptive HA removal in water treatment process. (C) 2012 Elsevier B.V. All rights reserved.
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