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Magnetite@ @carbon (Fe 3 O 4 @ @C) composites were prepared using three kinds of Fe 3 O 4 nanoparticles (NPs). All the Fe 3 O 4 @ @C composites could be easily separated from water by an external magnet. The Fe 3 O 4 NPs synthesized by a microreactor system have the smallest size and narrowest size distribution among the three kinds of Fe 3 O 4 NPs. The saturated capacity of the Fe 3 O 4 @ @ @C composite originating from microreactor-prepared Fe 3 O 4 NPs to absorb Rhodamine B at 20 • C exceeds 135 mg g −1 , which is 1.35 times as much as the value of the Fe 3 O 4 @ @C composite originating from traditional Fe 3 O 4 NPs. This value for the Fe 3 O 4 @ @C composite using commercial Fe 3 O 4 NPs as core is only 76 mg g −1. The Fe 3 O 4 @ @C composite using microreactor-prepared Fe 3 O 4 NPs also has good retrievability and reusability.