For treatment of clay
Andrea's answers are good, but be sure to use a probe sonicator
graphene oxide and nanoclays can be easily mixed in aqueous dispersions. Thereafter, GO could be reduced to rGO.
If you need graphene-clay mixture to be loaded into a polymer matrix, you could achieve a homogeneous mixture by freeze-drying.
This article may help
Article An Investigation on Graphene and Nanoclay Effects on Hybrid ...
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