Preparation of Fe3O4/Ag nanoparticles-functionalized fishnet-like calcium alginate nanonetwork composite and its application in heavy metal ion removal
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In this study, we prepared Fe 3 O 4 and Ag nanoparticles (NPs) functionalized calcium alginate (CA) nanonetwork (Fe 3 O 4 /Ag-CAN) composite by a green and low-cost synthetic route. The obtained Fe 3 O 4 /Ag-CAN exhibits a porous fishnet-like nanonetwork structure (FLNS), which originates from the self-weaving of sodium alginate nanowires (SA NWs), requiring no additional templates or techniques, and Fe 3 O 4 /Ag NPs are tightly immobilized in this structure. As a matrix material, the porous FLNS of CA provides a greater specific surface area, which is beneficial to expose more active sites to adsorb metal ions in solution. Meanwhile, Fe 3 O 4 /Ag NPs endow CAN with additional magnetic separation and antibacterial properties. The results of the Fe 3 O 4 /Ag-CAN adsorption experiment demonstrate high removal efficiency, fast adsorption rate, and low adsorbent dosage. The interaction between heavy metal ions and Fe 3 O 4 /Ag-CAN fits well with the Langmuir isotherm model and the pseudo-second-order kinetic model. The thermodynamics of adsorption gives a diffusion-controlled process. In addition, the magnetic and antibacterial properties of Fe 3 O 4 /Ag-CAN are briefly studied.
