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Issue 5, 2019
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Fabrication of poly(β-cyclodextrin)-conjugated magnetic graphene oxide by surface-initiated RAFT polymerization for synergetic adsorption of heavy metal ions and organic pollutants

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Abstract

In order to realize synergetic adsorption of heavy metal ions and organic pollutants, poly(β-cyclodextrin)-conjugated magnetic graphene oxide (MGO@poly(β-CD)) was designed and fabricated. The MGO@poly(β-CD) was characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction and vibrating sample magnetometry, respectively. Results indicated that the MGO@poly(β-CD) was successfully prepared and the adsorbent could be separated easily once an external magnetic field was applied. The adsorption behaviors of Cd2+ and sulfamethazine (SMT) by MGO@poly(β-CD) in the single and binary systems were investigated. The adsorption amounts of both Cd2+ and SMT were pH-dependent, and the increase in the ionic strength of solutions resulted in significant decrease of their adsorption amounts. The adsorption of Cd2+ and SMT on MGO@poly(β-CD) was achieved by different mechanisms, respectively. The sorption of Cd2+ was related to complexation and electrostatic interactions, while the removal of SMT was realized by hydrogen bonding, host–guest supramolecular and π–π interactions. The synergetic adsorption of Cd2+ and SMT in the binary systems was attributed to interactions between loaded Cd2+ (SMT) and free SMT (Cd2+) in solutions. These results provided valuable information for designing novel adsorbents that can be used for synergetic adsorption of heavy metal ions and organic pollutants.

Graphical abstract: Fabrication of poly(β-cyclodextrin)-conjugated magnetic graphene oxide by surface-initiated RAFT polymerization for synergetic adsorption of heavy metal ions and organic pollutants

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Publication details

The article was received on 24 Sep 2018, accepted on 18 Dec 2018 and first published on 18 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA09250H
Citation: J. Mater. Chem. A, 2019,7, 2055-2065

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    Fabrication of poly(β-cyclodextrin)-conjugated magnetic graphene oxide by surface-initiated RAFT polymerization for synergetic adsorption of heavy metal ions and organic pollutants

    J. Wang, W. Zhang and J. Wei, J. Mater. Chem. A, 2019, 7, 2055
    DOI: 10.1039/C8TA09250H

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