Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 2, Pages 425-432Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am302500v
Keywords
grapheme hydrogel; bioinspired coating; polydopamine; water purification; adsorption; heavy metal ions
Funding
- program of Nanyang Assistant Professorship
- Nanyang Technological University, Singapore
- INSIST program at Nanyang Technological University
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We present a one-step approach to polydopamine-modified graphene hydrogel, with dopamine serving as both reductant and surface functionalization agents. The synthetic method is based on the spontaneous polymerization of dopamine and the self-assembly of graphene nanosheets into porous hydrogel structures. Benefiting from the abundant functional groups of polydopamine and the high specific surface areas of graphene hydrogel with three-dimensional interconnected pores, the prepared material exhibits high adsorption capacities toward a wide spectrum of contaminants, including heavy metals, synthetic dyes, and aromatic pollutants. Importantly, the free-standing graphene hydrogel can be easily removed from water after adsorption process, and can be regenerated by altering the pH values of the solution for adsorbed heavy metals or using low-cost alcohols for synthetic dyes and aromatic molecules.
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