Eco-friendly seeded Fe₃O₄-Ag nanocrystals: a new type of highly efficient and low cost catalyst for methylene blue reduction.

The intensity of the typical absorption peaks at 665 nm shows a decreasing trend and disappears completely after 30, 24 and 18 min for Fe 3 O 4 -Ag 10 mg-10 mL, Fe 3 O 4 -Ag 10 mg-50 mL and Fe 3 O 4 -Ag 10 mg-100 mL, respectively. 64 This indicates the catalytic reduction and the complete removing of MB has been achieved by the Fe 3 O 4 -Ag seeds nanocrystals, which can be verified by the color variation of MB over time from blue to colorless (Fig.

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