Graphene oxide-branched polyethylenimine foams for efficient removal of toxic cations from water

Highly porous foams based on graphene oxide functionalized with polyethylenimine are generated and used with unprecedented efficiency for adsorbing heavy metal ions. A multiscale analysis of the GO-BPEI nanocomposite provided evidence for the covalent grafting of BPEI on GO and the formation of low...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018, Vol.6 (2), p.9384-939
Main Authors: Pakulski, Dawid, Czepa, W odzimierz, Witomska, Samanta, Aliprandi, Alessandro, Pawlu, Piotr, Patroniak, Violetta, Ciesielski, Artur, Samorì, Paolo
Format: Article
Language:English
Subjects:
Activated carbon
Adsorption
Cadmium
Cations
Chemical Sciences
Copper
Enthalpy
Entropy
Foams
Free energy
Gibbs free energy
Graphene
Heavy metals
Lead
Material chemistry
Metal ions
Multiscale analysis
Nanocomposites
pH effects
Plastic foam
Polyethyleneimine
Sorbents
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Summary:Highly porous foams based on graphene oxide functionalized with polyethylenimine are generated and used with unprecedented efficiency for adsorbing heavy metal ions. A multiscale analysis of the GO-BPEI nanocomposite provided evidence for the covalent grafting of BPEI on GO and the formation of low crystalline porous foams. The uptake experiments revealed that the GO-BPEI's adsorption of toxic cations is strongly dependent on the pH in range from 2 to 10, as a result of the different interactions at the supramolecular level between the metal ions and the GO-BPEI foam. The maximum uptake capacities for Cu( ii ), Cd( ii ) and Pb( ii ) are achieved at pH = 5 and exhibit values as high as 1096, 2051 and 3390 mg g −1 , respectively, being ca. over 20 times greater than standard sorbents like activated carbon. The GO-BPEI composite can be easily regenerated as proven by performing adsorption cycles. Also, the thermodynamic parameters including standard Gibbs free energy (Δ G o ), the enthalpy change (Δ H o ) and entropy change (Δ S o ) revealed the exothermic and spontaneous nature of the adsorption process. Highly porous foams based on graphene oxide functionalized with branched polyethylenimine are generated and used with unprecedented efficiency for adsorbing heavy metal ions.
ISSN:2050-7488
2050-7496
DOI:10.1039/c8ta01622d