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Effect of oxygen-containing functional groups on the adsorption of cationic dye by magnetic graphene nanosheets.
- Source :
-
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A . Dec2017, Vol. 128, p155-161. 7p. - Publication Year :
- 2017
-
Abstract
- Since its high stability, large specific surface area, honeycomb structure, high recovery and reproducibility, magnetic graphene has become a research hotspot in recent years. Batch equilibrium experiments of methylene blue (MB) were conducted on magnetic graphene nanosheets (Fe 3 O 4 @GNs) and magnetic graphene oxide (Fe 3 O 4 @GO) to probe effect of oxygen-containing functional groups (OFGs) on the potential active centers and adsorption mechanism of the cationic dyes. The microstructure and morphology of the magnetic graphene-based materials were characterized by X-ray diffraction spectra (XRD), Fourier transform infrared spectra (FTIR) and Scanning electron microscopy (SEM) technologies. Owing to the OFGs attenuation, Fe 3 O 4 @GNs presented a very high maximum monolayer MB adsorption capacity of 211.34 mg g −1 at 318 K and can be recycled easily by an external magnet. The kinetic results prove that the adsorption rate of MB mainly controlled by a chemical-sorption involving π–π force through sharing and electrons exchange between Fe 3 O 4 @GNs and MB molecular. It indicates that the enhanced hydrophobic and the strong π–π interaction can be influenced from the disappearing of C O functional groups. This group may be responsible for the attractive performance of Fe 3 O 4 @GNs. In addition, SEM results confirm that the role of Fe 3 O 4 nanoparticles is not only can effectively prevent the aggregation of GNs but also be beneficial to improving the adsorption ability. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02638762
- Volume :
- 128
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A
- Publication Type :
- Academic Journal
- Accession number :
- 126313268
- Full Text :
- https://doi.org/10.1016/j.cherd.2017.10.007