标题:Core-shell superparamagnetic Fe3O4@β-CD composites for host-guest adsorption of polychlorinated biphenyls (PCBs)
作者:Wang, Manlin ;Liu, Peng ;Wang, Yu ;Zhou, Dongmei ;Ma, Chen ;Zhang, Dongju ;Zhan, Jinhua
作者机构:[Wang, Manlin ;Ma, Chen ;Zhang, Dongju ;Zhan, Jinhua ] Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Department of Chemist 更多
通讯作者:Zhan, Jinhua
来源:Journal of Colloid and Interface Science
出版年:2015
卷:447
页码:1-7
DOI:10.1016/j.jcis.2015.01.061
摘要:The effective recognition and enrichment of trace polychlorinated biphenyls (PCBs) in the environment are currently challenging issues due to human health concerns. In this paper, a surface absorptive layer coating superparamagnetic Fe3O4nanoparticles for PCBs enrichment were prepared. This protocol involved the synthesis of Fe3O4particles through a solvothermal reaction and the covering of a silica layer bonded β-cyclodextrin (β-CD) over Fe3O4via a sol-gel process to construct core-shell Fe3O4@β-CD composites. β-CD was linked covalently to Fe3O4nanoparticles to generate the binding sites, enhancing the stability of Fe3O4nanoparticles in water. Meanwhile, superparamagnetic Fe3O4core could be rapidly separated from matrix to simplify time-consuming washing extraction. The adsorption capacity of Fe3O4@β-CD composites to PCB28 and PCB52 in aqueous solutions was investigated. To estimate the theoretical binding site number of Fe3O4@β-CD, the obtained binding data were replotted according to Scatchard equation. The host-guest interaction between β-CD and PCBs were further examined with density functional theory (DFT) calculations. It provides theoretical evidence of β-CD as host molecule has a higher binding amount towards PCB-28 than PCB-52 on the basis of their optimized geometries and calculated complexation energies. The nanomaterial reported herein is an ideal candidate for various applications, including the recognition and removal of environmentally deleterious substances.
© 2015 Elsevier Inc.
收录类别:EI
资源类型:期刊论文
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