The removal of NA fromamodel and real solution by HSANGs was studied and investigated. HSANGs were first characterized using TEM, STM, and surface area analysis, and the results revealed that the HSANGs exist as short stacks of transparent graphene sheets with a platelet shape, a layered structure with different sectional areas that are less than a micron and with an average thickness of 2.0 nm, and a BET specific surface area of 677.5 m2 g^-1
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