Three-dimensional Fe3O4-graphene macroscopic composites for arsenic and arsenate removal

•3D graphene macroscopic gel was prepared under basic conditions at low temperature.•As(III) and As(V) with sub-ppm concentrations were efficiently removed.•The modification of polydopamine strengthen the 3D graphene-based macrostructure.•The solid and liquid phases for water purification were separ...

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Bibliographic Details
Published in:Journal of hazardous materials 2015-11, Vol.298, p.28-35
Main Authors: Guo, Liangqia, Ye, Peirong, Wang, Jing, Fu, Fengfu, Wu, Zujian
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Arsenate
Arsenates
Arsenates - isolation & purification
Arsenic
Arsenic - isolation & purification
Ferrous Compounds - chemistry
Graphene
Graphite - chemistry
Hydrogen-Ion Concentration
Indicators and Reagents
Indoles - chemistry
Magnetics
Microscopy, Electron, Scanning
Nanoparticles
Polymers - chemistry
Removal
Self assembly
Spectrum Analysis, Raman
Temperature
Thermodynamics
Three dimensional
Water Pollutants, Chemical - isolation & purification
Water Purification
X-Ray Diffraction
X-ray photoelectron spectroscopy
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Summary:•3D graphene macroscopic gel was prepared under basic conditions at low temperature.•As(III) and As(V) with sub-ppm concentrations were efficiently removed.•The modification of polydopamine strengthen the 3D graphene-based macrostructure.•The solid and liquid phases for water purification were separated by filtration. 3D graphene macroscopic gel synthesized via self-assembly of GO nanosheets under basic conditions at low temperature is modified with polydopamine and Fe3O4 nanoparticles. The modification of polydopamine can not only strengthen the 3D graphene-based macroscopic architecture but also enhance the loadage and binding ability of Fe3O4 nanoparticles. The synthesized 3D Fe3O4-graphene macroscopic composites are characterized by SEM, XRD, XPS, BET, Raman and magnetic property and used as a versatile adsorbent for sub-ppm concentration of As(III) and As(V) removal from aqueous solutions. The experimental results suggest that the synthesized 3D Fe3O4-graphene macroscopic composites are promising for treating low concentration of arsenic contaminated water.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2015.05.011