The marine oil spill has caused significant pollution to the global environment. Dispersants are frequently utilized to break down the oil slick into smaller droplets, facilitating the biodegradation of the oil. Here, Janus nanosheet (JNs) were used as a new particulate dispersant, which can synergize with bacteria in seawater to remediate marine oil spill pollution efficiently. JNs possess not only amphiphilic properties and low toxicity but also demonstrate exceptional emulsification capabilities for oil, synergistically enhancing the remediation process alongside oil-degrading bacteria. Due to the inherent constraints on interfacial rotation and multilayer steric hindrance at the diesel-water interface, the emulsion created by JNs remains highly stable, maintaining a small oil droplet size even after a month. Significantly, JNs enable the binding of negatively charged oil-degrading bacteria through electrostatic interactions. Following their combination, the JNs effectively transported bacteria directly to the surface of the oil droplets through the influence of sea waves. This cooperative treatment system not only enhances the oil's dispersibility, but also markedly augments the biodegradation of the oil when compared to the use of bacteria alone. At a diesel concentration of 6 mL/L and a JNs concentration of 0.3 g/L, the bacterial biodegradation of diesel was reduced from 5 days to 3 days, and the diesel biodegradation rate increased from 70% to 85%. These findings underscore the remarkable capacity of JNs to effectively emulsify oil and enhance bacterial oil degradation in seawater.

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