| FLG | few-layer graphene; |
| OBPs | the products were only obtained by ball milling without Fe3O4 nanoparticles; |
| BHPs | the products were obtained by the two-step method without Fe3O4 nanoparticles; |
| OHPs | the products were only obtained by hydrothermal treatment; |
| BFPs | the products were only obtained by ball milling with Fe3O4 nanoparticles; |
| BMPs | the products were obtained by ball milling with Fe3O4 nanoparticles in the two-step method; |
| PTFE | polytetrafluoroethylene; |
| PET | polyethylene glycol terephthalate. |
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