Enhanced adsorption of humic acid on amine functionalized magnetic mesoporous composite microspheres
Enhanced adsorption of humic acid on amine functionalized magnetic mesoporous composite microspheres
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胺功能化磁性介孔复合微球对腐植酸的增强吸附
DOI：
10.1016/j.colsurfa.2012.04.050
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发表时间：
2012-07-20
影响因子：
5.2
通讯作者：
Wang, Yilong
中科院分区：
文献类型：
--
作者：
Tang, Yulin;Liang, Song;Wang, Yilong
采用典型的溶剂热法合成了Fe3O4 @介孔SiO2核壳复合微球（MS），并对其进行了PEI功能化（MS-PEI）。采用扫描电子显微镜、透射电子显微镜、能量色散X射线衍射仪、N2吸附-脱附、Zeta电位测定、X射线衍射仪和振动样品磁强计对微球的结构进行了表征。高饱和磁化强度（31.9emu/g）使它们在外加磁场下更容易和更快地从水中分离。批量吸附实验表明，MS-PEI对HA水溶液表现出较高的吸附亲和力，最大吸附容量为128.64 mg/g。HA在MS和MS-PEI上的吸附等温线均符合Freundlich模型，表明吸附过程是非均相的。HA在MS和MS-PEI上的吸附符合准二级动力学方程。HA在吸附剂上的吸附被发现是强烈依赖于pH值。HA负载MS-PEI可以有效地在0.1 M NaOH中解吸。再生后的微球可循环使用。因此，它可以作为一种很有前途的吸附剂，用于水处理过程中的吸附去除HA。(C)2012爱思唯尔有限公司版权所有。
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.