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A total of 0.10 mL of aqueous 4-NP solution (0.005
M) was mixed with 1.0 mL of fresh NaBH4 (0.2 M) solution.
Subsequently, 1.0 mL of aqueous dispersion of the Fe3O4@SiO2-
Au@mSiO2 microspheres (0.3 wt %) was added, and solution was
quickly subjected to UV-vis measurements;
To study the reusability of the magnetic catalysts, the used
magnetic microspheres were separated from the solution with a
magnet after the monitoring whole reduction process was com-
pleted. The recycled magnetic microspheres were washed with
ethanol 6 times and with deionized water 3 times. Similar to the
above reduction process, the obtained magnetic microspheres were
redispersed with 1.0 mL of deionized water and mixed with 0.1
mL of aqueous 4-NP solution (0.005 M) and 1.0 mL of fresh NaBH4
(0.2 M) solution. After reaction for 20 min, the solution was
measured using UV-vis spectroscopy.
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