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By introducing the oil/water interface, graphene can be easily and quickly separated from the graphene/NMP solution, which overcomes shortcomings of the time-consuming method of filtration.
For the first time, we also developed a prototype method of post-treating the waste water collected from the systems of synthesizing and purifying graphene oxide.
By using this green photo-reduction method, high-purity of reduced graphene oxide can be easily obtained by water-rinse, since soluble sulfite are the only by-products.
In a wet environment, like filters for drinking water, the graphene will not stay clean and will likely oxidize, and thus adsorption onto graphene oxide, rather than clean graphene, is a more relevant process to study.
Moreover, they show no damage or delamination in water, acid, and basic solutions even after months. Graphene oxide membranes show great potential for water filtering, but improving their performance and stability remains difficult.
In this work, floc-flotation has been introduced into the elimination of graphene oxide (GO) from water for the first time, so as to reduce its potential risk and biotoxicity.
The combined use of ferrate and graphene oxide/iron oxide is an efficient, cheap, and green alternative for water remediation.
It is the good dispersibility of reduced graphene oxide in water that will facilitate its further use in composite materials and conductive ink.
Our results indicate that it is possible to develop a graphene oxide-based water filtration technology.

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