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Open AccessArticle

Facile Fabrication of Magnetic Metal-Organic Framework Composites for the Highly Selective Removal of Cationic Dyes

College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China
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Materials 2018, 11(5), 744; https://doi.org/10.3390/ma11050744
Received: 11 April 2018 / Revised: 30 April 2018 / Accepted: 3 May 2018 / Published: 7 May 2018
In this work, we show a novel magnetic composite material Fe3O4@HPU-9 (HPU-9 = {[Cd(L)0.5(H2O)](DMA)(CH3CN)}n) (H4L = 1,1′-di(3,5-dicarbonylbenzyl)-2,2′bimidazoline, DMA = N,N-dimethylacetamide) constructed by in situ growth of HPU-9 on Fe3O4, which has excellent absorption of cationic dyes from aqueous solution. The Fe3O4@HPU-9 particle possesses a well-defined core-shell structure consisting of a Fe3O4 core (diameter: 190 nm) and a HPU-9 shell (thickness: 10 nm). In the composite, the HPU-9 shell contributes to the capsulation of cationic dyes through electrostatic attractions between HPU-9 and cationic dyes, while the Fe3O4 core serves as magnetic particle. The maximum absorption capacity of Fe3O4@HPU-9 for R6G was 362.318 mg·g−1. The absorption kinetics data were well described by a psedo-second-order model (R2 > 0.99), and the equilibrium data were also well fitted to Langmuir isotherm model (R2 > 0.99). Our data confirmed that the proposed magnetic composite could be recycled and reused several times without centrifugal separation, making it more convenient, economic and efficient than common adsorbents. View Full-Text
Keywords: magnetic composite material; core-shell structure; the capsulation of cationic dyes; electrostatic attractions magnetic composite material; core-shell structure; the capsulation of cationic dyes; electrostatic attractions
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MDPI and ACS Style

Li, H.; Li, Q.; He, Y.; Zhang, N.; Xu, Z.; Wang, Y. Facile Fabrication of Magnetic Metal-Organic Framework Composites for the Highly Selective Removal of Cationic Dyes. Materials 2018, 11, 744.

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