采用β-环糊精(β-CD)、FeCl2、Fe2(SO4)3、Na3 P3 O9等为主要原料,制备了阴离子β-CD 磁性微球(β-CDM),通过 X射线衍射、扫描电镜、粒度和热重等对其进行表征、测试,采用原子吸收光谱研究其吸附性能。结果表明,β-CDM 呈规整球形,平均粒径为93.5μm,热性能随Fe3 O4的引入得以提高,对 Cu2+、Mn2+和Zn2+的吸附具有选择性,对 Mn2+的吸附量最大,除去率达到98.59%。准二级吸附动力学模拟结果表明,β-CDM对Cu2+、Mn2+、Zn2+的吸附速率常数K2(g/(mg·min))可分别达到0.1851,0.1068,0.1584,对Cu2+吸附达平衡时所需时间最短。循环使用研究表明,β-CDM在磁场作用下具有较好的分离和循环使用性能。
In this paper,anionicβ-cyclodextrin magnetic microsphere (β-CDM)was prepared by usingβ-CD, FeCl2 ,Fe2 (SO4 )3 and Na3 P3 O9 as main materials.The characterization and performance tests such as X-ray diffraction (XRD),scanning electron microscope (SEM),particle size analysis,TGA and atomic absorption spectroscopy were further studied.The results show the morphology ofβ-CDM presents regular spherical and the average particle size was 93.5μm.Thermal performance increases with increasing Fe3 O4 content.It demon-strates elective adsorption for Cu2+,Mn2+ and Zn2+.The maximum removal rate of Mn2+ reaches 98.59%. The simulation results by quasi secondary adsorption kinetics show that the adsorption rate constant K 2 (g/(mg ·min))for Cu2+,Zn2+,Mn2+ can reach 0.1851,0.1068,0.1584,respectively.And it takes the shortest time for Cu2+ to reach equilibrium.What’s more,recycle studies show thatβ-CDM was in favor of separation and regenerate under the magnetic field.
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