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Title: Controllable synthesis of tetraethylenepentamine modified graphene foam (TEPA-GF) for the removal of lead ions
Authors: Han, Z
Tang, Z
Sun, Y
Yang, J
Zhi, L
Issue Date: 2015
Source: Scientific reports, 19 2015, v. 5, no. , p. 1-8
Abstract: 3D graphene foam for water purification has become pervasive recently, not only because it has high specific surface area for adsorption capacity, but also it is easily separated from solution after adsorption. However, it is still challenging because it is hard to improve the adsorption capacity as well as maintain the high mechanical strength. To overcome the challenge, Tetraethylenepentamine modified Graphene Foam (TEPA-GF) was synthesized via a one-step hydrothermal method by using GO and TEPA as raw materials. TEPA acted as both cross-linker to combine GO sheets together and reductant of GO during hydrothermal process. Results indicated that the resultant hydrogel's formation was highly dependent on the mass ratio of TEPA to GO, they cross-linked into a stable hydrogel with perfect cylindrical only when MTEPA: MGO ≥ 1. What's more, the highest mechanical strength of GF happened at the mass ratio of MTEPA: MGO = 3, which was up to 0.58 kPa. It was worth noting that TEPA-GF demonstrated high adsorption capacity for lead ions, which reached as high as 304.9 mg g-1, much higher than that of other absorbents. Furthermore, TEPA-GF was easily separated from water after adsorption of Pb2+, making it a great potential material for water purification.
Publisher: Nature Publishing Group
Journal: Scientific reports 
EISSN: 2045-2322
DOI: 10.1038/srep16730
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
The following publication Han, Z. et al. Controllable Synthesis of Tetraethylenepentamine Modified Graphene Foam (TEPA-GF) for the Removal of Lead ions. Sci. Rep. 5, 16730 (2015) is available at
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