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In this paper, Fe3O4/Ag/RGO reusable ternary nanocomposites are explored via a facile one-pot solvothermal strategies, and the catalytic performance and antibacterial activity are investigated in detail. The catalytic performance of Fe3O4/Ag/RGO towards the reduction of 4-NP into 4-AP is evaluated, and the reaction rate constant (k) for Fe3O4/Ag/RGO is calculated to be 0.03086 s−1, which is higher than that of Fe3O4/Ag (0.01756 s−1), indicating the catalytic activity is improved after decorating Fe3O4/Ag onto the graphene sheet. The antibacterial experiment shows Fe3O4/Ag/RGO ternary nanocomposites present a wide range of antibacterial activities against Gram-positive bacteria (S. aureus and B. cereus) and Gram-negative bacteria (E. coli and P. aeruginosa). The minimal inhibitory concentrations (MIC) for Fe3O4/Ag/RGO nanocomposites against four bacterial species are determined. Additionally, Fe3O4/Ag/RGO nanocomposites also present high reusability as catalyst and antibacterial agent. The results illustrated in this paper imply that the multifunctional performances such as efficient reduction of 4-NP followed by superior anti-reproduction of pathogenic bacteria make the Fe3O4/Ag/RGO ternary nanocomposites a promising catalyst for dye-polluted water and disinfectant agent for wastewater treatment and purification.

S-doped porous carbon (S/C) has been successfully fabricated from biomass waste (drug residue). The S/C not only has a unique porous structure and channel, but porous structures are interconnected to form a sponge-like structures. The unique structure not only increases the specific surface area and energy storage sites, but also shortens the path of ion transmission and charge transfer. When S/C-1 is used as lithium ion batteries (LIBs) anode, the capacity of 710 mAh g−1 can be achieved after 50 cycles at 0.1 A g−1. The capacity still has 364 mAh g−1 at 5 A g−1 for long-life-cycle. For sodium ion batteries (SIBs), a capacity of 518 mAh g−1 can be delivered at 0.1 A g−1 for 50 cycles, and a capacity of long-life-cycle at 5 A g−1 still maintains 230 mAh g−1. The improving rate capacities of S/C-1 can be attributed to the short diffusion lengths of Li+ and Na+ ions for uniform sponge-like structure, large specific surface area (SSA) and additional active sites. This work has an important opportunity to change the current energy situation.